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Transport Properties of (NH 4 ) 2 CuCl 4 .2H 2 O Low Dimensional Single Crystals
Author(s) -
Narsimlu N.,
Siva Kumar K.
Publication year - 2002
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/1521-4079(200209)37:9<945::aid-crat945>3.0.co;2-v
Subject(s) - tetragonal crystal system , electrical resistivity and conductivity , single crystal , activation energy , materials science , conductivity , crystallography , diffraction , relaxation (psychology) , crystal structure , depolarization , phase (matter) , analytical chemistry (journal) , chemistry , optics , physics , medicine , psychology , social psychology , organic chemistry , chromatography , quantum mechanics , endocrinology
The X‐ray diffraction and Infrared (IR) spectral studies of (NH 4 ) 2 CuCl 4 .2H 2 O single crystals reveals that these crystals contains tetragonal crystal structure with the unit cell dimensions of a = 7.58Å, c = 7.95Å, z= 2, β =90° and two water molecules in the unit cell. The temperature dependence of thermally stimulated depolarization current (TSDC) and dc electrical conductivity (σ) studies of this two‐dimensional (NH 4 ) 2 CuCl 4 .2H 2 O single crystal have been carried out in 77K–300K temperature region. The TSDC thermograph shows only one sharp peak at 248K with a peak current of 130nA, which is attributed to the Maxwell‐Wagner peak. The activation energy (U), relaxation time (τ) are calculated as 0.78eV and 3.44×10 ‐15 s respectively. Dc electrical conductivity studies of these crystals show a first order phase transition at about 248K.