Na2PrO3 is Caswellsilverite-like structured and crystallizes in the orthorhombic Immm space group. Na(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form NaO6 octahedra that share corners with two equivalent Pr(1)O6 octahedra, corners with four equivalent Na(1)O6 octahedra, edges with five equivalent Pr(1)O6 octahedra, and edges with seven equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. Pr(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form PrO6 octahedra that share corners with two equivalent Pr(1)O6 octahedra, corners with four equivalent Na(1)O6 octahedra, edges with two equivalent Pr(1)O6 octahedra, and edges with ten equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-5°. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Na(1) and two equivalent Pr(1) atoms to form a mixture of edge and corner-sharing ONa4Pr2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second O site, O(2) is bonded to four equivalent Na(1) and two equivalent Pr(1) atoms to form a mixture of edge and corner-sharing ONa4Pr2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°.
Na2PrO3 is Caswellsilverite-like structured and crystallizes in the orthorhombic Immm space group. Na(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form NaO6 octahedra that share corners with two equivalent Pr(1)O6 octahedra, corners with four equivalent Na(1)O6 octahedra, edges with five equivalent Pr(1)O6 octahedra, and edges with seven equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. Both Na(1)-O(1) bond lengths are 2.55 Å. There are two shorter (2.40 Å) and two longer (2.60 Å) Na(1)-O(2) bond lengths. Pr(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form PrO6 octahedra that share corners with two equivalent Pr(1)O6 octahedra, corners with four equivalent Na(1)O6 octahedra, edges with two equivalent Pr(1)O6 octahedra, and edges with ten equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-5°. Both Pr(1)-O(1) bond lengths are 2.39 Å. All Pr(1)-O(2) bond lengths are 2.40 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Na(1) and two equivalent Pr(1) atoms to form a mixture of edge and corner-sharing ONa4Pr2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second O site, O(2) is bonded to four equivalent Na(1) and two equivalent Pr(1) atoms to form a mixture of edge and corner-sharing ONa4Pr2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°.