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Effect of Glass Composition on the Dielectric Properties of a Liquid-Phase-Sintered MgO-Doped BaTiO3

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A series of BaTiO3–MgO–glass mixtures has been sintered via liquid-phase sintering in a reducing atmosphere at 1280°C by controlling MgO/CaO ratio in an aluminum borosilicate glass composition, and the subsequent microstructure, phase evolution, and dielectric properties have been investigated. The growth of BaTiO3 grains was inhibited in all of the prepared specimens with the evidence of Mg incorporation to the BaTiO3 lattice from the glass. The change in MgO/CaO ratio in the glass notably modified the dielectric properties: a high MgO/CaO ratio in the glass resulted in a decreased dielectric constant, a decreased phase transition temperature, a broadened temperature range of phase transition, a decreased temperature coefficient of capacitance, and increased electrical resistivity.
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Document Type: Research Article

Affiliations: 1: School of Materials Science & Engineering, Seoul National University, Shillim-Dong, Gwanak-Gu, Seoul 151-744, Korea 2: Department of Ceramic Engineering, Kangnung National University, Jibyun-Dong, Kangnung 210-702, Korea 3: School of Advanced Materials Engineering, Kookmin University, Jeongneung-Dong, Seongbuk-Gu, Seoul 136-702, Korea

Publication date: 2008-07-01

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