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Erschienen in:
01.03.2014
Enhanced giant dielectric response in Sr[(Fe0.5Nb0.5)1−xTix]O3 solid solutions
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 3/2014
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Abstract
In the present work, the modified dielectric relaxations with extended giant dielectric constant step were observed in Sr[(Fe0.5Nb0.5)1−x
Ti
x
]O3 solid solutions. The structure of Sr[(Fe0.5Nb0.5)1−x
Ti
x
]O3 solid solutions changed from orthorhombic to cubic with increasing x. A dielectric relaxation following Arrhenius law of Sr[(Fe0.5Nb0.5)1−x
Ti
x
]O3 solid solutions was observed at lower temperature. The dielectric constant of Sr[(Fe0.5Nb0.5)1−x
Ti
x
]O3 solid solutions decreased firstly and then increased with increasing SrTiO3 content at 1 kHz, while the dielectric loss was suppressed monotonically. At x = 0.8, the dielectric loss at room temperature and 1 kHz was 0.16 which was much smaller than that for x = 0 (tanδ = 0.37), while the dielectric constant was increased to 6,815, and the temperature stability was also improved. This indicated that the dielectric characteristics of Sr(Fe0.5Nb0.5)O3 ceramics could be significantly improved by forming solid solution with SrTiO3.