Dielectric and ferroelectric properties of Ba0.8Sr0.2Ti1−5x/4NbxO3 ceramics |
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Authors: | Wan Q CaoLi Yang Mukhlis M Ismail Ping Feng |
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Affiliation: | a Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Material Science and Engineering, Hubei University, Wuhan 430062, China b School of Applied Sciences, University of Technology, Baghdad, Iraq |
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Abstract: | Ba0.8Sr0.2Ti1−5x/4NbxO3 ceramics, x = 0, 0.01, 0.05, 0.10, were fabricated by conventional solid-state reaction. With increasing niobium content the ferroelectric phase transition temperature decreases linearly, and the dispersivity of the transition increases. Niobium B-site decreases transition temperature more pronounced than Sr2+ at A-site. The heterovalent substitution of Nb5+ in low content causes local defect dipole, while more substitutions introduce disorder to disturb the long-range dipole correlation. Ba0.8Sr0.2Ti1−0.5/4Nb0.1O3 ceramic shows weak ferroelectric loop at room temperature far from its transition temperature, 153 K. |
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Keywords: | Ba0 8Sr0 2TiO3 Niobium Relaxor ferroelectrics |
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