Microwave Dielectric Properties and Microstructures of Ca_<1-x>Nd_<2x/3>TiO_3-Li_<1/2>Nd_<1/2>TiO_3 Ceramics

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The microwave dielectric properties and microstructures of (1 - y) Ca_<1-x>Nd_<2x/3>TiO_3-Li_<1/2>Nd_<1/2>TiO_ ceramics, prepared by a mixed oxide route, have been investigated. A maximum quality factor Q x f = 8600 GHz (where f is the resonant frequency) was achieved for samples with y = 0 and x = 0.39, although the dielectric properties varied with sintering temperature. The Q x f value of (1 - y) Ca_<1-x>Nd_<2x/3>TiO_3-Li_<1/2>Nd_<1/2>TiO_3 increased up to 1400℃, after which it decreased. The decrease in dielectric properties was coincident with the onset of rapid grain growth. In the (1 - y)Ca_<1-x>Nd_<2x/3>TiO_3-Li_<1/2>Nd_<1/2>TiO_3-y Li_<1/2>Nd_<1/2>TiO_3 system, as y increased, the temperature coefficient of resonant frequency Cry) decreased from 800 to 8 ppm/℃ for y = 0.52 (x = 0.39). However, the optimum combination of microwave dielectric properties was achieved at 1400℃ for samples where y = 0.45 (x = 0.39) with a dielectric constant Sr of 101, a Q x f value of 5300 (at 7.2 GHz) and a τ_f value of + 13 ppm/℃.
社団法人応用物理学会の論文
2002-09-15