期刊
CHEMISTRY OF MATERIALS
卷 25, 期 1, 页码 48-54出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm3031363
关键词
Bi-based relaxors; sillenites; impedance spectroscopy; Raman spectroscopy
资金
- EPSRC [EP/G005001/1]
- EPSRC [EP/G005001/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G005001/1] Funding Source: researchfish
A combination of fixed frequency dielectric measurements (10(3) to 10(6) Hz) and impedance spectroscopy reveal evidence of (nonferroelectric) relaxor-like behavior in the temperature range similar to 600-750 K for the stoichiometric sillenite phase Bi12SiO20 (space group I23, a = 10.1034(5) angstrom). Variable temperature Raman Spectroscopy reveals significant changes associated with the Bi-O framework vibrations, and the relaxor-type behavior is attributed to noncorrelated local dipole moments associated with the BiO5E (E = 6s(2) lone pair) units in the framework. Sillenites, therefore, represent another family of Bi-based oxides to exhibit relaxor-like dielectric behavior.
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