Vibrational spectroscopy and microwave dielectric properties of Ca5−xBaxNb2TiO12 and Ca5−xBaxTa2TiO12 ceramics
作者： Anderson Dias , Pazhoor Varghese Bijumon , Mailadil Thomas Sebastian , Roberto Luiz Moreira , None
DOI: 10.1063/1.2112179
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摘要: Complex ceramics Ca5−xBaxNb2TiO12 and Ca5−xBaxTa2TiO12 were prepared by conventional solid-state ceramic route. The crystalline structures determined x-ray diffraction, which showed that solid solutions formed for x=4 (CaBa4Nb2TiO12 CaBa4Ta2TiO12) multiphases appeared 1⩽x⩽3. dielectric properties of the sintered measured in microwave frequency range. constant temperature variation resonant increased quality factor decreased with increasing x value. Raman analyses different spectra depending upon composition, variations both intensity frequency, as well number bands strictly related to phases present. For Nb- Ta-based systems, results indicated an increase short-range ordering barium substitution, explained reduction unloaded (Qu). far-infrared spectroscopy agree data, few v...
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