Effect of Ca substitution sites on dielectric properties and relaxor behavior of Ca doped barium strontium titanate ceramics
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Microstructure, dielectric properties, and ferroelectric relaxor behavior of Ca doped barium strontium titanate (BSCT) ceramics prepared by solid-state reaction were investigated. It was demonstrated that the unit cell volume of the BSCT ceramics firstly decreases with the increase of Ca contents up to x = 0.08, but increases with further addition of Ca (x ≥ 0.12). The shrinkage of the unit cell volume resulted from the substitution of Ba2+ by Ca2+ when x ≤ 0.08, which enhanced the relaxor behavior of the ferroelectrics. Conversely, a small amount of Ca2+ substituted for Ti4+ site when x ≥ 0.12, which weakens the relaxor behavior of the BSCT ceramics. The 8 mol % doped BSCT ceramic yielded the maximum index of relaxation (γ) of 1.90 and made it a promising candidate for future industrial application of efficient and eco-friendly relaxor ferroelectric materials.
KeywordsBaTiO3 Perovskite Structure Unit Cell Volume Relaxor Behavior Barium Strontium Titanate
This work was financially supported by the National Natural Science Foundation of China (Number 51072235), Natural Science Foundation of Hunan Province (Number 11JJ1008), Ph.D. Programs Foundation of Ministry of Education of China (Number 20110162110044) and Defense Industrial Technology Development Program (Number A1420133028).
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