NaLaNb(PO4)3 crystallizes in the trigonal R3c space group. Na(1) is bonded in a distorted hexagonal planar geometry to three equivalent O(3) and three equivalent O(4) atoms. La(1) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form LaO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. Nb(1) is bonded to three equivalent O(2) and three equivalent O(4) atoms to form NbO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with two equivalent La(1)O6 octahedra and corners with two equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 21-38°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one La(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Nb(1) and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one La(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Nb(1), and one P(1) atom.
NaLaNb(PO4)3 crystallizes in the trigonal R3c space group. Na(1) is bonded in a distorted hexagonal planar geometry to three equivalent O(3) and three equivalent O(4) atoms. All Na(1)-O(3) bond lengths are 2.91 Å. All Na(1)-O(4) bond lengths are 2.61 Å. La(1) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form LaO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. All La(1)-O(1) bond lengths are 2.27 Å. All La(1)-O(3) bond lengths are 2.33 Å. Nb(1) is bonded to three equivalent O(2) and three equivalent O(4) atoms to form NbO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. All Nb(1)-O(2) bond lengths are 2.04 Å. All Nb(1)-O(4) bond lengths are 2.08 Å. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with two equivalent La(1)O6 octahedra and corners with two equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 21-38°. The P(1)-O(1) bond length is 1.50 Å. The P(1)-O(2) bond length is 1.62 Å. The P(1)-O(3) bond length is 1.51 Å. The P(1)-O(4) bond length is 1.59 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one La(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Nb(1) and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one La(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Nb(1), and one P(1) atom.