Low temperature sintering and microwave dielectric properties of ZnTiNb2O8 ceramics with BaCu(B2O5) additions
2011; Elsevier BV; Volume: 130; Issue: 3 Linguagem: Inglês
10.1016/j.matchemphys.2011.08.010
ISSN1879-3312
AutoresDongxiang Zhou, Gang Dou, Mei Guo, Shuping Gong,
Tópico(s)Dielectric properties of ceramics
ResumoThe phases, microstructure and microwave dielectric properties of ZnTiNb2O8 ceramics with BaCu(B2O5) additions prepared by solid-state reaction method have been investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The pure ZnTiNb2O8 ceramic shows a high sintering temperature of about 1250 °C. However, it was found that the addition of BaCu(B2O5) lowered the sintering temperature of ZnTiNb2O8 ceramics from above 1250 °C to 950 °C due to the BCB liquid-phase. The results showed that the microwave dielectric properties were strongly dependent on densification, crystalline phases and grain size. Addition of 3 wt% BCB in ZnTiNb2O8 ceramics sintered at 950 °C afforded excellent dielectric properties of ɛr = 32.56, Q × f = 20,100 GHz (f = 5.128 GHz) and τf = −64.87 ppm/°C. These represent very promising candidates for LTCC dielectric materials.
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