Na2PtO3 is Caswellsilverite-like structured and crystallizes in the triclinic P1 space group. There are eight inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(10), one O(11), one O(5), one O(7), one O(8), and one O(9) atom to form distorted NaO6 octahedra that share corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Na(7)O6 octahedra, corners with two equivalent Pt(1)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Pt(3)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, edges with two equivalent Pt(2)O6 octahedra, and edges with two equivalent Pt(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-17°. In the second Na site, Na(2) is bonded to one O(1), one O(12), one O(2), one O(3), one O(5), and one O(7) atom to form NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Pt(1)O6 octahedra, corners with two equivalent Pt(3)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, edges with two equivalent Pt(3)O6 octahedra, and edges with two equivalent Pt(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-15°. In the third Na site, Na(3) is bonded to one O(1), one O(12), one O(2), one O(3), one O(4), and one O(6) atom to form NaO6 octahedra that share corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Na(6)O6 octahedra, corners with two equivalent Pt(2)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Pt(4)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, edges with two equivalent Pt(1)O6 octahedra, and edges with two equivalent Pt(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-17°. In the fourth Na site, Na(4) is bonded to one O(1), one O(12), one O(2), one O(3), one O(4), and one O(6) atom to form NaO6 octahedra that share corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Pt(4)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Pt(2)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, edges with two equivalent Pt(1)O6 octahedra, and edges with two equivalent Pt(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-17°. In the fifth Na site, Na(5) is bonded to one O(10), one O(11), one O(4), one O(6), one O(8), and one O(9) atom to form NaO6 octahedra that share corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Pt(2)O6 octahedra, corners with two equivalent Pt(4)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, edges with two equivalent Pt(1)O6 octahedra, and edges with two equivalent Pt(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-15°. In the sixth Na site, Na(6) is bonded to one O(11), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form NaO6 octahedra that share corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Pt(2)O6 octahedra, corners with two equivalent Pt(4)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, edges with two equivalent Pt(3)O6 octahedra, and edges with two equivalent Pt(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-15°. In the seventh Na site, Na(7) is bonded to one O(10), one O(11), one O(5), one O(7), one O(8), and one O(9) atom to form NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(8)O6 octahedra, corners with two equivalent Pt(3)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Pt(1)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, edges with two equivalent Pt(2)O6 octahedra, and edges with two equivalent Pt(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-17°. In the eighth Na site, Na(8) is bonded to one O(1), one O(10), one O(12), one O(4), one O(6), and one O(9) atom to form NaO6 octahedra that share corners with two equivalent Na(7)O6 octahedra, corners with two equivalent Pt(1)O6 octahedra, corners with two equivalent Pt(3)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with two equivalent Pt(1)O6 octahedra, and edges with two equivalent Pt(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-16°. There are four inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to one O(1), one O(10), one O(12), one O(4), one O(6), and one O(9) atom to form PtO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Na(8)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra,  an edgeedge with one Pt(3)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, and edges with two equivalent Pt(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-14°. In the second Pt site, Pt(2) is bonded to one O(10), one O(11), one O(4), one O(6), one O(8), and one O(9) atom to form PtO6 octahedra that share corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Na(6)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Pt(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, and edges with two equivalent Pt(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-14°. In the third Pt site, Pt(3) is bonded to one O(1), one O(12), one O(2), one O(3), one O(5), and one O(7) atom to form PtO6 octahedra that share corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Na(7)O6 octahedra, corners with two equivalent Na(8)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Pt(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, and edges with two equivalent Pt(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-15°. In the fourth Pt site, Pt(4) is bonded to one O(11), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form PtO6 octahedra that share corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Na(6)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Pt(2)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, and edges with two equivalent Pt(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-15°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), one Na(3), one Na(4), one Na(8), one Pt(1), and one Pt(3) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 2-8°. In the second O site, O(2) is bonded to one Na(2), one Na(3), one Na(4), one Na(6), one Pt(3), and one Pt(4) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 6-9°. In the third O site, O(3) is bonded to one Na(2), one Na(3), one Na(4), one Na(6), one Pt(3), and one Pt(4) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 2-13°. In the fourth O site, O(4) is bonded to one Na(3), one Na(4), one Na(5), one Na(8), one Pt(1), and one Pt(2) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 5-13°. In the fifth O site, O(5) is bonded to one Na(1), one Na(2), one Na(6), one Na(7), one Pt(3), and one Pt(4) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 5-11°. In the sixth O site, O(6) is bonded to one Na(3), one Na(4), one Na(5), one Na(8), one Pt(1), and one Pt(2) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 7-10°. In the seventh O site, O(7) is bonded to one Na(1), one Na(2), one Na(6), one Na(7), one Pt(3), and one Pt(4) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 2-11°. In the eighth O site, O(8) is bonded to one Na(1), one Na(5), one Na(6), one Na(7), one Pt(2), and one Pt(4) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 2-8°. In the ninth O site, O(9) is bonded to one Na(1), one Na(5), one Na(7), one Na(8), one Pt(1), and one Pt(2) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 6-11°. In the tenth O site, O(10) is bonded to one Na(1), one Na(5), one Na(7), one Na(8), one Pt(1), and one Pt(2) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 5-11°. In the eleventh O site, O(11) is bonded to one Na(1), one Na(5), one Na(6), one Na(7), one Pt(2), and one Pt(4) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 6-9°. In the twelfth O site, O(12) is bonded to one Na(2), one Na(3), one Na(4), one Na(8), one Pt(1), and one Pt(3) atom to form a mixture of distorted corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 5-10°.
Na2PtO3 is Caswellsilverite-like structured and crystallizes in the triclinic P1 space group. There are eight inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(10), one O(11), one O(5), one O(7), one O(8), and one O(9) atom to form distorted NaO6 octahedra that share corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Na(7)O6 octahedra, corners with two equivalent Pt(1)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra,  an edgeedge with one Pt(3)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, edges with two equivalent Pt(2)O6 octahedra, and edges with two equivalent Pt(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-17°. The Na(1)-O(10) bond length is 2.34 Å. The Na(1)-O(11) bond length is 2.28 Å. The Na(1)-O(5) bond length is 2.39 Å. The Na(1)-O(7) bond length is 2.40 Å. The Na(1)-O(8) bond length is 2.25 Å. The Na(1)-O(9) bond length is 2.43 Å. In the second Na site, Na(2) is bonded to one O(1), one O(12), one O(2), one O(3), one O(5), and one O(7) atom to form NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Pt(1)O6 octahedra, corners with two equivalent Pt(3)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra,  an edgeedge with one Na(8)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, edges with two equivalent Pt(3)O6 octahedra, and edges with two equivalent Pt(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-15°. The Na(2)-O(1) bond length is 2.41 Å. The Na(2)-O(12) bond length is 2.52 Å. The Na(2)-O(2) bond length is 2.44 Å. The Na(2)-O(3) bond length is 2.46 Å. The Na(2)-O(5) bond length is 2.27 Å. The Na(2)-O(7) bond length is 2.35 Å. In the third Na site, Na(3) is bonded to one O(1), one O(12), one O(2), one O(3), one O(4), and one O(6) atom to form NaO6 octahedra that share corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Na(6)O6 octahedra, corners with two equivalent Pt(2)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra,  an edgeedge with one Pt(4)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, edges with two equivalent Pt(1)O6 octahedra, and edges with two equivalent Pt(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-17°. The Na(3)-O(1) bond length is 2.29 Å. The Na(3)-O(12) bond length is 2.24 Å. The Na(3)-O(2) bond length is 2.34 Å. The Na(3)-O(3) bond length is 2.29 Å. The Na(3)-O(4) bond length is 2.45 Å. The Na(3)-O(6) bond length is 2.34 Å. In the fourth Na site, Na(4) is bonded to one O(1), one O(12), one O(2), one O(3), one O(4), and one O(6) atom to form NaO6 octahedra that share corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Pt(4)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra,  an edgeedge with one Pt(2)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, edges with two equivalent Pt(1)O6 octahedra, and edges with two equivalent Pt(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-17°. The Na(4)-O(1) bond length is 2.31 Å. The Na(4)-O(12) bond length is 2.34 Å. The Na(4)-O(2) bond length is 2.34 Å. The Na(4)-O(3) bond length is 2.42 Å. The Na(4)-O(4) bond length is 2.34 Å. The Na(4)-O(6) bond length is 2.36 Å. In the fifth Na site, Na(5) is bonded to one O(10), one O(11), one O(4), one O(6), one O(8), and one O(9) atom to form NaO6 octahedra that share corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Pt(2)O6 octahedra, corners with two equivalent Pt(4)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Na(6)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, edges with two equivalent Pt(1)O6 octahedra, and edges with two equivalent Pt(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-15°. The Na(5)-O(10) bond length is 2.43 Å. The Na(5)-O(11) bond length is 2.43 Å. The Na(5)-O(4) bond length is 2.40 Å. The Na(5)-O(6) bond length is 2.39 Å. The Na(5)-O(8) bond length is 2.40 Å. The Na(5)-O(9) bond length is 2.52 Å. In the sixth Na site, Na(6) is bonded to one O(11), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form NaO6 octahedra that share corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Pt(2)O6 octahedra, corners with two equivalent Pt(4)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Na(5)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, edges with two equivalent Pt(3)O6 octahedra, and edges with two equivalent Pt(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-15°. The Na(6)-O(11) bond length is 2.41 Å. The Na(6)-O(2) bond length is 2.35 Å. The Na(6)-O(3) bond length is 2.42 Å. The Na(6)-O(5) bond length is 2.49 Å. The Na(6)-O(7) bond length is 2.40 Å. The Na(6)-O(8) bond length is 2.43 Å. In the seventh Na site, Na(7) is bonded to one O(10), one O(11), one O(5), one O(7), one O(8), and one O(9) atom to form NaO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(8)O6 octahedra, corners with two equivalent Pt(3)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra,  an edgeedge with one Pt(1)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, edges with two equivalent Pt(2)O6 octahedra, and edges with two equivalent Pt(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-17°. The Na(7)-O(10) bond length is 2.34 Å. The Na(7)-O(11) bond length is 2.31 Å. The Na(7)-O(5) bond length is 2.41 Å. The Na(7)-O(7) bond length is 2.36 Å. The Na(7)-O(8) bond length is 2.33 Å. The Na(7)-O(9) bond length is 2.37 Å. In the eighth Na site, Na(8) is bonded to one O(1), one O(10), one O(12), one O(4), one O(6), and one O(9) atom to form NaO6 octahedra that share corners with two equivalent Na(7)O6 octahedra, corners with two equivalent Pt(1)O6 octahedra, corners with two equivalent Pt(3)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with two equivalent Pt(1)O6 octahedra, and edges with two equivalent Pt(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-16°. The Na(8)-O(1) bond length is 2.41 Å. The Na(8)-O(10) bond length is 2.42 Å. The Na(8)-O(12) bond length is 2.40 Å. The Na(8)-O(4) bond length is 2.43 Å. The Na(8)-O(6) bond length is 2.50 Å. The Na(8)-O(9) bond length is 2.37 Å. There are four inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to one O(1), one O(10), one O(12), one O(4), one O(6), and one O(9) atom to form PtO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Na(8)O6 octahedra,  an edgeedge with one Na(7)O6 octahedra,  an edgeedge with one Pt(3)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, and edges with two equivalent Pt(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-14°. The Pt(1)-O(1) bond length is 2.10 Å. The Pt(1)-O(10) bond length is 2.08 Å. The Pt(1)-O(12) bond length is 2.01 Å. The Pt(1)-O(4) bond length is 2.16 Å. The Pt(1)-O(6) bond length is 2.05 Å. The Pt(1)-O(9) bond length is 2.08 Å. In the second Pt site, Pt(2) is bonded to one O(10), one O(11), one O(4), one O(6), one O(8), and one O(9) atom to form PtO6 octahedra that share corners with two equivalent Na(3)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Na(6)O6 octahedra,  an edgeedge with one Na(4)O6 octahedra,  an edgeedge with one Pt(4)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(5)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, edges with two equivalent Na(8)O6 octahedra, and edges with two equivalent Pt(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-14°. The Pt(2)-O(10) bond length is 2.14 Å. The Pt(2)-O(11) bond length is 2.15 Å. The Pt(2)-O(4) bond length is 2.05 Å. The Pt(2)-O(6) bond length is 2.09 Å. The Pt(2)-O(8) bond length is 2.04 Å. The Pt(2)-O(9) bond length is 2.05 Å. In the third Pt site, Pt(3) is bonded to one O(1), one O(12), one O(2), one O(3), one O(5), and one O(7) atom to form PtO6 octahedra that share corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Na(7)O6 octahedra, corners with two equivalent Na(8)O6 octahedra,  an edgeedge with one Na(1)O6 octahedra,  an edgeedge with one Pt(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, edges with two equivalent Na(4)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, and edges with two equivalent Pt(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-15°. The Pt(3)-O(1) bond length is 2.12 Å. The Pt(3)-O(12) bond length is 2.07 Å. The Pt(3)-O(2) bond length is 2.16 Å. The Pt(3)-O(3) bond length is 2.07 Å. The Pt(3)-O(5) bond length is 2.08 Å. The Pt(3)-O(7) bond length is 2.01 Å. In the fourth Pt site, Pt(4) is bonded to one O(11), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form PtO6 octahedra that share corners with two equivalent Na(4)O6 octahedra, corners with two equivalent Na(5)O6 octahedra, corners with two equivalent Na(6)O6 octahedra,  an edgeedge with one Na(3)O6 octahedra,  an edgeedge with one Pt(2)O6 octahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(6)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, and edges with two equivalent Pt(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-15°. The Pt(4)-O(11) bond length is 2.10 Å. The Pt(4)-O(2) bond length is 2.04 Å. The Pt(4)-O(3) bond length is 2.04 Å. The Pt(4)-O(5) bond length is 2.10 Å. The Pt(4)-O(7) bond length is 2.15 Å. The Pt(4)-O(8) bond length is 2.10 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), one Na(3), one Na(4), one Na(8), one Pt(1), and one Pt(3) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 2-8°. In the second O site, O(2) is bonded to one Na(2), one Na(3), one Na(4), one Na(6), one Pt(3), and one Pt(4) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 6-9°. In the third O site, O(3) is bonded to one Na(2), one Na(3), one Na(4), one Na(6), one Pt(3), and one Pt(4) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 2-13°. In the fourth O site, O(4) is bonded to one Na(3), one Na(4), one Na(5), one Na(8), one Pt(1), and one Pt(2) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 5-13°. In the fifth O site, O(5) is bonded to one Na(1), one Na(2), one Na(6), one Na(7), one Pt(3), and one Pt(4) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 5-11°. In the sixth O site, O(6) is bonded to one Na(3), one Na(4), one Na(5), one Na(8), one Pt(1), and one Pt(2) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 7-10°. In the seventh O site, O(7) is bonded to one Na(1), one Na(2), one Na(6), one Na(7), one Pt(3), and one Pt(4) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 2-11°. In the eighth O site, O(8) is bonded to one Na(1), one Na(5), one Na(6), one Na(7), one Pt(2), and one Pt(4) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 2-8°. In the ninth O site, O(9) is bonded to one Na(1), one Na(5), one Na(7), one Na(8), one Pt(1), and one Pt(2) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 6-11°. In the tenth O site, O(10) is bonded to one Na(1), one Na(5), one Na(7), one Na(8), one Pt(1), and one Pt(2) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 5-11°. In the eleventh O site, O(11) is bonded to one Na(1), one Na(5), one Na(6), one Na(7), one Pt(2), and one Pt(4) atom to form a mixture of corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 6-9°. In the twelfth O site, O(12) is bonded to one Na(2), one Na(3), one Na(4), one Na(8), one Pt(1), and one Pt(3) atom to form a mixture of distorted corner and edge-sharing ONa4Pt2 octahedra. The corner-sharing octahedral tilt angles range from 5-10°.