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Molecular motions and phase transitions in solid tris(n‐propylammonium) hexabromobismuthate (III)
Author(s) -
Pislewski N.,
TrittGoc J.,
Jakubas R.
Publication year - 1996
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221930208
Subject(s) - chemistry , crystallite , phase transition , atmospheric temperature range , tris , dilation (metric space) , crystallography , ammonium , anomaly (physics) , relaxation (psychology) , condensed matter physics , thermodynamics , physics , organic chemistry , geometry , mathematics , psychology , social psychology , biochemistry
The proton NMR second moment and spin‐lattice relaxation time for polycrystalline tris(n‐propylammonium) hexabromobismuthate (n‐C 3 H 7 NH 3 ) 3 BiBr 6 (nPBB) are measured from 70 to 290 K. The results are interpreted in terms of the methyl and ammonium group reorientations for which the activation parameters are determined. In addition linear thermal expansion measurements are carried out in the temperature range 270 to 295K. A distinct anomaly in the thermal dilation occurs at 281 K indicating a first‐order phase transition.