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Dielectric and Vibrational Properties of La3+ Substituted Relaxor (Na1/2Bi1/2)TiO3 Ceramics
N. Zhong,A. Hushur,G. Shabbir,S. Kojima 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Dierent concentrations of A-site substitute La3+ were selected to modify (Na1=2Bi1=2)TiO3 ceramics. Dielectric permittivity and dissipation factor (tan ) of Na1=2Bi1=2xLax)TiO3 (x = 0.5%, 1 %, 5 % and 10 %) were measured at room temperature. Raman scattering was performed on all components at room temperature. From the dielectric measurement, we can conclude that both permittivity and tan markedly depend on frequency. At low frequency, permittivity and tan varied, and increased with La3+ concentration. However, in comparison with those at low frequency, permittivity and tan changed little at high frequency. The Raman spectra show that all bands are relatively broad, which is mainly due to the disorder on the A-site ions of perovskite structure. The bands around 130 cm1 and 270 cm1 were selected to analyzed, since they are well separated from others. With an increase of La3+ concentration, the band around 130 cm1 showed nearly no shift, while the band around 270 cm1 shifted to lower frequency.