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Crystal data for a new family of phases, Li 3 Mg 2 X O 6 : X =Nb, Ta, Sb
Author(s) -
Castellanos M.,
Gard J. A.,
West A. R.
Publication year - 1982
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889882011522
Subject(s) - crystallography , powder diffraction , diffraction , x ray crystallography , unit (ring theory) , crystal structure , electron diffraction , space group , materials science , chemistry , physics , mathematics , optics , mathematics education
Three members of a new family of phases, Li 3 Mg 2 X O 6 : X = Nb, Ta, Sb, have been prepared by solid‐state reaction of MgO and Li 3 X O 4 . Unit‐cell parameters of Li 3 Mg 2 TaO 6 determined by electron diffraction and refined by X‐ray powder diffraction are a = 8.883(2), b = 5.802(2), c = 17.437(6) Å, with space group Fddd ; z = 8. Powder diffraction data of Li 3 Mg 2 NbO 6 and Li 3 Mg 2 SbO 6 were indexed by analogy with those of Li 3 Mg 2 TaO 6 and unit‐cell dimensions obtained by least‐squares refinement: Li 3 Mg 2 NbO 6 a = 8.552(2), b = 5.897(1), c = 17.721(5) Å; Li 3 Mg 2 SbO 6 a = 8.614 (1), b = 5.908(1), c = 17.759(5) Å.