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Five new polytypes and polytypic change in PbI 2
Author(s) -
Minagawa T.
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/s0021889879011778
Subject(s) - diffraction , crystallography , x ray crystallography , materials science , chemistry , physics , optics
Five new PbI 2 polytypes, 8 H (1232), 10 H (11112112), 10 H (112222), 22 H [11(22) 5 ] and 30 R [111313] 3 , were solved by the X‐ray diffraction method. It was found on polytypic change that ( a ) the 2 H polytype is changed into various polytypes on heating at 130°C and most of these further change to 12 R [13] 3 on heating at 260°C; ( b ) the polytypes 4 H , faulted 4 H , 14 H , 22 H , 26 H and 30 R with layer structures similar to the 12 R [13] 3 are fairly stable at high temperatures; ( c ) the 2 H ‐30 R [111313] 3 transformation occurs reversibly.