Influence of the Strain on Dielectric and Ferroelectric Properties of 0.5BaZr0.2Ti0.8O3-0.5Ba0.7Ca0.3TiO3.

Authors :: Xu, Xijun
Yuan, Guoliang
Xu, Bo
Yin, Jiang
Liu, Junming
Liu, Zhiguo
Brennecka, G. L.
Source :: Journal of the American Ceramic Society; Sep2015, Vol. 98 Issue 9, p2823-2828, 6p, 5 Graphs
Publication Year :: 2015
Abstract: 0.5BaZr<subscript>0.2</subscript>Ti<subscript>0.8</subscript>O<subscript>3</subscript>-0.5Ba<subscript>0.7</subscript>Ca<subscript>0.3</subscript>TiO<subscript>3</subscript> ceramic and its epitaxial films on (0 0 1) SrTiO<subscript>3</subscript> substrate were prepared to compare their dielectric and ferroelectric properties. The ceramic has a high dielectric permittivity, a weak dielectric relaxation, a low ferroelectric Curie temperature ( T<subscript>C</subscript>) of 60°C and a fast polarization relaxation. The films show much lower dielectric permittivities and mild dielectric relaxations. Furthermore, the T<subscript>C</subscript> of film with 40, 100, and 200 nm thickness is 155°C, 110°C, and 60°C, respectively, because the epitaxial strain decreases with the film thickness increasing. The higher the T<subscript>C</subscript> is, the more stable the room-temperature polarization is. [ABSTRACT FROM AUTHOR]

Subjects :: STRAINS & stresses (Mechanics)
DIELECTRIC properties
FERROELECTRICITY
EPITAXY
THIN films
PERMITTIVITY

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