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Crystal data for PbGe[Ge 3 O 9 ]( h )
Author(s) -
Otto H. H.,
Dietrich A.
Publication year - 1979
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/s0021889879012887
Subject(s) - crystallography , crystal (programming language) , materials science , physics , chemistry , computer science , programming language
Trilling crystals of PbGe[Ge 3 O 9 ]( h ) were grown from the melt by spontaneous crystallization. The crystals develop pseudo‐trigonal‐prismatic habit. The unit cell is monoclinic but pseudo‐rhombohedral. The probable space groups are C 2/ m , C 2 or Cm . The lattice constants of the reduced monoclinic unit cell are a = 7.331 (7), b = 11.455 (3), c = 6.831 (6) Å, β = 141.97 (13)°. D x = 6.029 Mg m ‐3 for Z = 2 formula units. The lattice constants of the pseudo‐rhombohedral setting are a 1 = a 2 = 6.800 (6), a 3 = 6.831 (6) Å, = β = 115.13 (19), γ = 114.76 (18)° and Z = 1. X‐ray powder data are given. Improved crystal data of PbGe[Ge 3 O 9 ]( t ) are also given.