High dielectric tunability of ferroelectric (Ba,Sr)(Zr,Ti)O ceramics.

Autor:	Chan, N., Choy, S., Wang, D., Wang, Y., Dai, J., Chan, H.
Předmět:	DIELECTRIC properties of ferroelectric ceramic materials X-ray diffraction SCANNING electron microscopy CURIE temperature DIELECTRIC loss TITANIUM oxides STRONTIUM oxide LATTICE constants
Zdroj:	Journal of Materials Science: Materials in Electronics; Jun2014, Vol. 25 Issue 6, p2589-2594, 6p
Abstrakt:	(Ba,Sr)(Zr,Ti)O (BSZT) ceramics with x = 0, 0.05, 0.15, 0.25, 0.35 and 0.45 were prepared by conventional solid state reaction method. The structural characterization with X-ray diffraction and scanning electron microscopy indicate a monotonical drop in lattice constants and grain size with the increase of Sr concentration. Consequently, the Curie temperature and remnant polarization of the ceramics exhibit a strong compositional dependence. A linear relationship between the Curie temperature and Sr concentration is revealed. At x = 0.45, the BSZT ceramics show substantially high tunability of over 55 % under 20 kV/cm dc electric field with very low dielectric loss value of 0.0025 at room temperature, suggesting the BSZT ceramics could be a promising alternative to traditional (Ba,Sr) TiO ferroelectrics for developing high frequency tunable dielectric devices. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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