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Role of a La on the nature of phase transition in the PLZT x/85/15 is compared with the PLZT compositions of lower Zr/Ti ratio. Thermal dependence of the dielectric permittivity, thermal expansion and elastic modulus reveal sequential transfer from macroscopic ferroelectric to antiferroelectric and nonpolar state, if La concentration is increased. Diffused, from frequency independent thermal dependence of dielectric permittivity for compositions in certain La concentration range above 4 at% coexist with the well expressed phase transition between paraelectric and antiferroelectric phases.
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Keywords: Phase transitions; dielectric permittivity; elastic modulus; polar microregions; thermal expansion

Document Type: Research Article

Affiliations: 1: Faculty of Physics, University of Vienna, Vienna, Austria 2: University of Latvia, Institute of Solid State Physics, Riga, Latvia

Publication date: 2008-01-01

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