Powder x-ray diffraction and Rietveld analysis of (C2H5NH3)2CuCl4 *

Abstract

Structural properties of the organic-inorganic hybrid (C2H5NH3)2CuCl4 (EA2CuCl4) have been investigated by means of x-ray powder diffraction and Rietveld analysis. A structural phase transition from Pbca to Aba2 occurs at T 4 = 240 K, which results in a paraelectric–ferroelectric phase transition. The release of the Jahn–Teller distortion with increasing temperature toward T 4 is revealed by the structural analysis.