Abstract
A polycrystalline sample of Sr9La2(WO6)4, nonastrontium dilanthanum tetrakis[orthotungstate(VI)], was prepared by heating a compacted powder mixture of SrCO3, WO3, and La2O3 with an Sr:La:W molar ratio of 9:2:4 at 1473 K. X-ray crystal structure analysis was performed for a Sr9La2(WO6)4 single-crystal grain grown by reheating the sample at 1673 K. Sr9La2(WO6)4 crystallizes with four formula units in the tetragonal space group I41/a and is isotypic with Sr11(ReO6)4. Two W sites with site symmetries of \overline{1} are located at the center of isolated [WO6] octahedra, and four mixed (Sr/La) sites are surrounded by eight to twelve O atoms of the [WO6] octahedra. The structure of Sr9La2(WO6)4 can be described on the basis of the double-perovskite structure with [WO6] and [(Sr/La)O
x
] polyhedra alternately placed, and a vacancy (□).
Funder
JSPS KAKENHI
the Cooperative Research of the Development Center for Advanced Materials, Institute for Materials Research, Tohoku University
the Tohoku University Center for Gender Equality Promotion Support Project
Publisher
International Union of Crystallography (IUCr)
Subject
Condensed Matter Physics,General Materials Science,General Chemistry