Microstructure and Dielectric Properties of Barium Strontium Magnesium Niobate |
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| Authors: | Hwack Joo Lee Hyun Min Park Yong Won Song Yang Koo Cho Sahn Nahm Jae-Dong Byun |
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| Affiliation: | New Materials Evaluation Center, Korea Research Institute of Standards and Science, Taeduk Science Town, Taejon 305–600, Korea;Division of Materials and Metallurgical Engineering, Korea University, Seoul 136–701, Korea |
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| Abstract: | Dielectric properties and their related microstructural characteristics in solid solutions of (1 – x )Ba(Mg1/3Nb2/3)O3– x Sr(Mg1/3Nb2/3)O3 (BMN–SMN, or BSMN) were investigated by measuring the relative permittivity (ɛr), Q values, and temperature coefficient of resonator frequency (τf), and by observing microstructure using transmission electron microscopy. When the tolerance factor ( t ) was >0.99 in BSMN with composition 0 < x < 0.5, where the tilting of oxygen octahedra was not involved, the microstructure included only 1:2 ordered phase. In the region where 0.99 > t > 0.97 with 0.7 < x < 1.0, the phase due to the antiphase tilting of oxygen octahedral, the disordered phase, and the 1:2 ordered phase were also present. In a few of the grains, core–shell-type structures, whose main components were dislocations and stacking faults, were found in the solid solution of BSMN. |
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| Keywords: | dielectric materials/properties niobium/niobium compounds microstructure |
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