Premium
DSC, X‐Ray Diffraction and Raman Studies in the Two‐Dimensional Compound CH 3 NH 3 HgCl(CN) 2
Author(s) -
Ben Hassen R.,
Ben Salah A.,
Daoud A.
Publication year - 1997
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 - 10.1002/1521-3951(199706)201:2<371::aid-pssb371>3.0.co;2-z
Subject(s) - monoclinic crystal system , raman spectroscopy , differential scanning calorimetry , crystallography , diffraction , phase transition , phase (matter) , crystallite , atmospheric temperature range , materials science , x ray crystallography , chemistry , analytical chemistry (journal) , crystal structure , condensed matter physics , physics , optics , thermodynamics , organic chemistry , chromatography
The Raman spectra (10 to 500 cm —1 ), X‐ray diffraction and differential scanning calorimetry of polycrystalline samples of CH 3 NH 3 HgCl(CN) 2 were investigated in the temperature range 300 to 400 K. This work shows a second‐order phase transition at 353 K. The room‐temperature phase is ordered and exhibits monoclinic symmetry (space group P/2m with a = 13.0544(10) Å, b = 4.1549(10) Å, c = 13.7512(10) Å, β = 93.32°, Z = 4). The high‐temperature phase is disordered and seems to have a monoclinic cell symmetry ( a = 18.499(6) Å, b = 4.782(2) Å, c = 18.109(7) Å, β = 94.72°, Z = 8).