Phase diagram and dielectric properties of mixed Cs1-x(NH4)(x)H2PO4 crystals

• Autor(es): Baranov, A. I. ; Dolbinina, V. V. ; Lanceros-Méndez, S. ; Schmidt, V. H.
• Data: 2002
• Identificador Persistente: http://hdl.handle.net/1822/4359
• Origem: RepositóriUM - Universidade do Minho
• Assunto(s): KDP; CDP; Mixed crystals; Dielectric; Quasi-one-dimensional
• Tipo de Documento: Artigo
• Idioma: Português

Descrição

Influence of NH4-->Cs substitution has been studied in the mixed Cs1-x(NH4)(x)H2PO4 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