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Paraelectric-antiferroelectric phase coexistence in the deuteron glass Rb-0.5(N...
Lanceros-Méndez, S.; Schmidt, V. H.; Shapiro, S. A.Neutron diffraction was used to study the paraelectric (PE) to antiferroelectric (AFE) phase transition in a deuteron glass crystal Rb-0.5(ND4)(0.5)D(2)ASO(4) (DRADA-50). Coexistence of AFE and PE phases was proven in a temperature range 7-12 K wide.
Data: 2004
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Origem: RepositóriUM - Universidade do Minho
Phase diagram and dielectric properties of mixed Cs1-x(NH4)(x)H2PO4 crystals
Baranov, A. I.; Dolbinina, V. V.; Lanceros-Méndez, S.; Schmidt, V. H.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...
Data: 2002
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Origem: RepositóriUM - Universidade do Minho
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