Raman study of (NH4)2CuCl4·2H2O-II: Order-disorder transition

Roy, A. P. ; Sahni, V. C. ; Bansal, M. L. (1979) Raman study of (NH4)2CuCl4·2H2O-II: Order-disorder transition Journal of Physics and Chemistry of Solids, 40 (4). pp. 289-292. ISSN 0022-3697

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002236...

Related URL: http://dx.doi.org/10.1016/0022-3697(79)90104-5


The results of a Raman scattering study of the order-disorder phase transition in (NH4)2CuCL4·2H2O are presented. From the variation of intensity of some selected modes in the temperature range 300-100°K, we have established the temperature dependence of the long range order parameter m, defined as the difference between the fractional number of NH4 ions in the two possible orientations. Since the ammonium network in (NH4)2CuCL4·2H2O is "quasi one-dimensional", in contrast to the three-dimensional network in NH4Cl, we discuss the consequence of this feature on the evolution of m.

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