Study of optical and transport properties of K2CuCl4 · 2H2O single crystal

✍ Scribed by N. Narsimlu; D. Srinivasu; Prof. Dr. G. S. Sastry

• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 238 KB
• Volume: 29
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.2170290423

✦ Synopsis

Study of Optical and Transport Properties of K2CuCl, e.2 H 2 0 Single Crystal Optical absorption, transport properties and EPR of K,CuCI, . 2 H,O single crystals have been studied.

The optical absorption in UV, and visible region are characterized by a charge transfer band, and in the near infrared region at 3998,4336, and 4480 cm-are attributed to transitions between the stark levels of copper(l1) ion in an extended octahedral crystal field. An anisotrophic 'g' value was observed with g,, = 2.12 and g, = 2.24 by EPR method. The spin orbit coupling constant is found to be 500 cm I . D.C. electrical conductivity measurements with temperature reveal an anisotropy characteristic of a two-dimensional layered structure and exhibit a first order irreversible structural phase-transition at 377 K, i.e. from tetragonal to monoclinic crystal system. X-ray diffraction studies and density calculations from the crystal structure data in both the phases suggest that the first order irreversible transition occurs following the loss of the two water molecules of hydration.