Microwave Dielectric Properties of (1−x)(Na1/2Nd1/2)TiO3−xLa(Mg1/2Ti1/2)O3 via Ordering and Far IR Reflectivity Spectra |
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| Authors: | Jae Beom Kim Ki Hyun Yoon Yong S Cho Woo Sup Kim Eung Soo Kim |
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| Affiliation: | Department of Ceramic Engineering, Yonsei University, Seoul 120-749, Korea; Chip Process Group, Component Team, Samsung Electro-Mechanics Co., Suwon 442-743, Korea; Department of Materials Engineering, Kyonggi University, Suwon 442-760, Korea |
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| Abstract: | Microwave dielectric properties of (1? x )(Na1/2Nd1/2)TiO3(NNT)? x La(Mg1/2Ti1/2)O3(LMT) system have been investigated with focus on structural ordering and far IR reflectivity spectra. A single perovskite phase was found to exist with various superlattice reflections over the entire compositional range. 1:1 ordering observed in the (111) reflection of X-ray diffraction patterns was found to progress significantly in the specimens above x =0.8. The ordering characteristics that presumably related to B-site Mg/Ti ordering were assumed to affect favorably the quality factor at microwave frequencies. The increase of the quality factor also could be explained in terms of the decrease of lattice anharmonicity with LMT by analysis of far IR reflectivity spectra. As expected from the values of pure NNT and LMT, the dielectric constant and the temperature coefficient of frequency tended to gradually decrease with increasing LMT content. |
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