Effect of ZnO-B2O3 Glass on Low Temperature Sintering and Properties of Li2Zn3Ti4O12-CaTiO3 Composite Ceramics

Abstract: The 0.94Li2Zn3Ti4O12-0.06CaTiO3 (LZT-CT) composite ceramics were prepared by the traditional solid-state reaction method, and ZnO-B2O3(ZB) glass was synthesized by high temperature melting method. The sintering characteristics, phase compositions, microstructures and microwave dielectric properties of LZT-CT composite ceramics with different mass fraction (x=0.5%, 1.0%, 1.5%, 2.0% and 2.5%) of ZB glass were investigated in detail. The results indicate that, the ZB glass effectively decreases the sintering temperature of the LZT-CT composite ceramics from 1 175 ℃ to 875 ℃ and also promotes the densifiction. There are no new phases in addition to the LZT and CT phase when ZB glass addition x≤2.5%. With the increase of ZB glass addition, the densification temperature of composite ceramics decreases gradually, the bulk density, relative permittivity (εr), quality factor (Q×f) initially increase and then decrease, and the temperature coefficient of resonance frequency (τf) is stable, fluctuated between -2.25×10-6/℃ and 4.51×106/℃. When added 2.0%ZB glass, LZT-CT composite ceramics sintered at 875 ℃ for 2 h obtained maximun bulk density of 4.22 g/cm3, and excellent microwave dielectric properties: εr=23.9, Q×f=58 595 GHz, τf=-0.14×10-6/℃.

Key words: ZnO-B2O3 glass, 0.94Li2Zn3Ti4O12-0.06CaTiO3 composite ceramics, low temperature sintering, microwave dielectric property

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