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Transport Properties of (NH4)2 CuCl4.2H2O Low Dimensional Single Crystals

✍ Scribed by N. Narsimlu; K. Siva Kumar

Publisher: John Wiley and Sons
Year: 2002
Tongue: English
Weight: 95 KB
Volume: 37
Category: Article
ISSN: 0232-1300
DOI: 10.1002/1521-4079(200209)37:9<945::aid-crat945>3.0.co;2-v

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✦ Synopsis

Transport Properties of (NH 4 ) 2 CuCl 4 .2H 2 O Low Dimensional Single Crystals

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 o 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 twodimensional (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 3.44x10

-15 s respectively. Dc electrical conductivity studies of these crystals show a first order phase transition at about 248K.

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