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Dielectric Properties of Barium Strontium Calcium Titanate Ceramics for a Microwave Phase Shifter
Sung-GapLee,Sung-SooLim,Young-HieLee 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.41 No.2
(Ba$_{0.6-x}$Sr$_{0.4}$Ca$_x$)TiO$_3$ (BSCT, $x$=0.10, 0.15, 0.20) specimens were fabricated by using the conventional mixed oxide method. The results of X-ray diffraction and microstructure analysis showed that all the BSCT specimens had a dense, homogeneous structure. The BSCT(50/40/10) specimen sintered at 1500 $^\circ$C showed the highest average grain size (18.25 $\mu$m). The Curie temperature and the relative dielectric constant at room temperature decreased with increasing Ca content. The Curie temperature of the BSCT(50/40/10) specimen showed a maximum value of -10 $^\circ$C. The relative dielectric constant and the dielectric loss of the BSCT(50/40/10) specimen, which was sintered at 1450 $^\circ$C and measured at 1 kHz, were about 4324 and 0.972 \%, respectively. The tunability increased with increasing Ca content, and the BSCT(50/40/10) specimen sintered at 1450 $^\circ$C showed a good value of 5.4 \% at 4 kV/cm.