Structure and dielectric relaxation properties of Na1−xLaxNb1−xCrxO3 perovskites

Na 1 − x La x Nb 1 − x Cr x O 3 perovskites were prepared by conventional solid-state reaction with x=0.01, 0.05, 0.1, 0.2, 0.3, and 0.4. The structure with x=0.01 is similar to that of NaNbO3 with an orthorhombic structure. The crystal structure for compositions for x over 0.05 was found to have a...

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Bibliographic Details
Published inJournal of applied physics Vol. 99; no. 6
Main Authors Hsiao, Yu-Jen, Chang, Yen-Hwei, Fang, Te-Hua, Chang, Yee-Shin, Chai, Yin-Lai
Format Journal Article
LanguageEnglish
Published 15.03.2006
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Summary:Na 1 − x La x Nb 1 − x Cr x O 3 perovskites were prepared by conventional solid-state reaction with x=0.01, 0.05, 0.1, 0.2, 0.3, and 0.4. The structure with x=0.01 is similar to that of NaNbO3 with an orthorhombic structure. The crystal structure for compositions for x over 0.05 was found to have a distorted cubic structure. Grains of microcube topography were obtained. The average grain size is about 1–2μm. The dielectric constants and dissipation factors were measured as functions of frequency (20Hz–1MHz) and temperature (225–500K). The activation energy for x=0.2, 0.3, and 0.4 were 0.22, 0.21, and 0.19eV, respectively. Space charge polarization and orientational polarization contribute to the observed dielectric behavior.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2182076