TY  - JOUR
AU  - WU, Mengjuan
AU  - ZHANG, Yingchun
AU  - XIANG, Maoqiao
PY  - 2019
TI  - Synthesis, characterization and dielectric properties of a novel temperature stable (1-x)CoTiNb2O8-xZnNb2O6 ceramic
JO  - Journal of Advanced Ceramics
SN  - 2226-4108
SP  - 228
EP  - 237
VL  - 8
IS  - 2
AB  - (1-x)CoTiNb2O8-xZnNb2O6 microwave dielectric ceramics were prepared via the conventional solid-state reaction route with the aim of reducing the τf value and improving the thermal stability. The phase composition and the microstructure were investigated using X-ray diffraction, Raman spectra, and scanning electron microscopy. A set of phase transitions which were induced by composition had been confirmed via the sequence: rutile structure→coexistence of rutile and columbite phase→columbite phase. For (1-x)CoTiNb2O8-xZnNb2O6 microwave dielectric ceramics, the addition of ZnNb2O6 content (x = 0-1) led to the decrease of εr from 62.98 to 23.94. As a result of the high Q × ƒ of ZnNb2O6 ceramics, the increase of ZnNb2O6 content also led to the lower sintering temperatures and the higher Q × ƒ values. The τf value was reduced from +108.04 (x = 0) to - 49.31 ppm/℃ (x = 1). Among them, high density 0.5CoTiNb2O8-0.5ZnNb2O6 ceramics were obtained at 1175 ℃ with excellent microwave dielectric properties of εr 39.2, Q × ƒ 40013 GHz, and τf + 3.57 ppm/℃.
UR  - https://doi.org/10.1007/s40145-018-0308-y
DO  - 10.1007/s40145-018-0308-y