Microwave Dielectric Properties of (1-x)(Mg_0.95Zn_0.05)TiO₃–xCa_0.6La_0.8/3TiO₃ Ceramic System

Abstract

The microstructures and microwave dielectric properties of the (1 À x)(Mg 0:95 Zn 0:05 )TiO 3 -xCa 0:6 La 0:8=3 TiO 3 ceramic system were investigated. To achieve a temperature-stable material, we studied a method of combining a positive-temperaturecoefficient material with a negative one. Ca 0:6 La 0:8=3 TiO 3 has the following dielectric properties: a dielectric constant of " r $ 109, a Q Â f of $17;600 GHz and a large positive f of $213 ppm/ C. (Mg 0:95 Zn 0:05 )TiO 3 possesses a dielectric constant of " r $ 16, a high Q Â f of $210;000 (at 9 GHz) and a negative f of À60 ppm/ C. As x varies from 0 to 0.9, the (1 À x)(Mg 0:95 Zn 0:05 )TiO 3 -xCa 0:6 La 0:8=3 TiO 3 ceramic system has the following dielectric properties: 16 < " r < 88, 32;800 < Q Â f < 210;000 and À60 < f < 205. By appropriately adjusting the x value in the (1 À x)(Mg 0:95 Zn 0:05 )TiO 3 -xCa 0:6 La 0:8=3 TiO 3 ceramic system, a zero f value can be attained. With x ¼ 0:15, a dielectric constant " r of $26, a Q Â f value of $86;000 GHz (at 9 GHz) and a f value of $0:5 ppm/ C were obtained for 0.85(Mg 0:95 Zn 0:05 )TiO 3 -0.15Ca 0:6 La 0:8=3 TiO 3 ceramics sintered at 1320 C for 4 h.

Structural, microwave dielectric properties and dielectric resonator antenna studies of Sr(ZrxTi1−x)O3 ceramics

“…Variation and loss in microwave dielectric properties is caused not only by the lattice vibrational modes, but also by the pores, impurities, lattice defects or secondary phases present in Table 3 Microwave dielectric properties of sintered Sr(ZrxTi1−x)O3 samples. the samples, and any kind of phase change occurring in the material [70][71][72].…”

Study of (1−x)(Mg0.6Zn0.4)0.95Co0.05TiO3–xCa0.61Nd0.26TiO3 microwave dielectrics

“…Huang et al reported that a new series of microwave dielectric materials with positive temperature coefficient of resonant frequency were added to (Mg, Co, Zn)TiO 3 ceramic system. The experiment results showed that these ceramic systems had excellent microwave dielectric properties [9][10][11][12].…”