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Alternative TitleEffect of solid-solution ratio factor on microwave dielectric properties of (Pb,Ca,La)(Fe,Nb)O_3 ceramics
杨秋红; 金应秀; 徐军
Source Publication硅酸盐学报
Other AbstractMicrowave dielectric properties of [(Pb_(0.5)Ca_(0.5))_(1-x)La_(2x/3)] (Fe_(0.5)Nb_(0.5))_(1-x)La_x] (Fe_(0.5)Nb_(0.5))O_(3+delta) in which A-sites were partly substituted by La~(3+) were investigated. It is suggested that the actual substitution is in the formula [(Pb_(0.5)Ca_(0.5))_(1-x)La_(2x/3+R(1-x))] (Fe_(0.5Nb_(0.5)O_(3+delta), where R is a solid - solution ratio factor affecting the microwave dielectric properties of A-site substitution ceramics. The A-site charge balance substitution of [(Pb_(0.5 Ca_(0.5))_(1-x)La_(2x/3)](Fe_(0.5) Nb_(0.5) O_3 increased its dielectric loss. When R > 0 and x = 0.05-0.10, the Qf value was less than 800 GHz. In contrast, the A-site charge unbalance substitution of [(Pb_(0.5)Ca_(0.5))_(1-x)La_x] (Fe_(0.5)Nb_(0.5))O_3 improved its microwave dielectric properties by the fact that the surplus of La~3 and (Pb,Ca)~(2+) eliminates oxygen vacancies in the solid solution. A single perovskite phase is formed when x ≤ 0.02. However, surplus La~(3+) would cause the formation of the secondary phase (pyrochlore phase) and the amount of the secondary phase was proportional to the amount of surplus La~(3+). The decreasing of the dielectric constant K with x value is caused by the formation of pyrochlore phase. At x = 0.02-0.075, the dielectric constant is above 100, the value of the quality factor Qf is 5 549-6 105 GHz, and the temperature coefficient of resonant frequency(alpha_f) is in the range of 7 * 10~(-6)-15.7 * 10~(-6)/℃. At x = 0.1, the Qf value reached the maximum of 6 482 GHz.
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Document Type期刊论文
Affiliation1.杨秋红, 上海大学材料学院, 上海 201800, 中国.
2.金应秀, 韩国京畿大学陶瓷工程系, 水原, 442-76, 韩国.
3.徐军, 中国科学院上海光学精密机械研究所, 上海 201800, 中国.
Recommended Citation
GB/T 7714
杨秋红,金应秀,徐军. 固溶率因子R对(Pb,Ca,La)(Fe,Nb)O_3陶瓷微波介电性能的影响[J]. 硅酸盐学报,2002,30(5):554.
APA 杨秋红,金应秀,&徐军.(2002).固溶率因子R对(Pb,Ca,La)(Fe,Nb)O_3陶瓷微波介电性能的影响.硅酸盐学报,30(5),554.
MLA 杨秋红,et al."固溶率因子R对(Pb,Ca,La)(Fe,Nb)O_3陶瓷微波介电性能的影响".硅酸盐学报 30.5(2002):554.
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