A new temperature stable microwave dielectric ceramics: ZnTiNb2O8 sintered at low temperatures
2011; Elsevier BV; Volume: 509; Issue: 20 Linguagem: Inglês
10.1016/j.jallcom.2011.01.095
ISSN1873-4669
AutoresMei Guo, Shuping Gong, Gang Dou, Dongxiang Zhou,
Tópico(s)Dielectric properties of ceramics
ResumoThe phases, microstructure and microwave dielectric properties of ZnTiNb2O8–xTiO2 composite ceramics with different weight percentages of BaCu(B2O5) additive prepared by solid-state reaction method have been investigated using the X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The results showed that the microwave dielectric properties were strongly dependent on densification, grain sizes and crystalline phases. The sintering temperature of ZnTiNb2O8 ceramics was reduced from 1250 °C to 950 °C by doping BaCu(B2O5) additive and the temperature coefficient of resonant frequency (τf) was adjusted from negative value of −52 ppm/°C to 0 ppm/°C by incorporating TiO2. Addition of 2 wt% BaCu(B2O5) in ZnTiNb2O8–xTiO2 (x = 0.8) ceramics sintered at 950 °C showed excellent dielectric properties of ɛr = 38.89, Q × f = 14,500 GHz (f = 4.715 GHz) and τf = 0 ppm/°C, which represented very promising candidates as LTCC dielectrics for LTCC applications.
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