Ferroelectrics

Phase Diagram and Dielectric Properties of Mixed Cs 1−X (NH 4 ) X H 2 PO 4 Crystals

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DOI:: 10.1080/00150190211553

A. I. Baranov^a, V. V. Dolbinina^a, S. Lanceros-Mendez^b & V. H. Schmidt^c

pages 225-230

Available online: 01 Oct 2010

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Influence of NH4 M Cs substitution has been studied in the mixed Cs 1 m x (NH 4 ) x H 2 PO 4 crystals system by means of dielectric measurements. The x-T phase diagram was determined: for ammonium concentrations up to 0.1 the system has a monoclinic paraelectric phase with a transition into a ferroelectric phase whose temperature increases with increasing ammonium concentration. For ammonium concentration 0.4 to 1.0 the system shows a tetragonal paraelectric phase and a transition into an antiferroelectric phase. No solid solutions with concentrations between 0.1 and 0.4 could be grown. The system was further studied with the quasi-one-dimensional Ising model and the three-dimensional anisotropic Ising model.