Low-temperature co-fired LiMnPO4–TiO2 ceramics with near-zero temperature coefficient of resonant frequency
Low-temperature co-fired LiMnPO4–TiO2 ceramics with near-zero temperature coefficient of resonant frequency
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DOI：
10.1007/s10854-017-7246-2
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发表时间：
2017-06
期刊：
影响因子：
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通讯作者：
C. Xia;G. H. Chen;C. Yuan;C. R. Zhou
中科院分区：
文献类型：
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作者：
C. Xia;G. H. Chen;C. Yuan;C. R. Zhou
研究了固相反应法制备的limnpo4 - tio2复合陶瓷的微波介电性能和显微结构。结果表明，纯LiMnPO4（LMP）陶瓷在750℃下烧结4 h，相对介电常数εr为6.7，高品质因数Q ×f为41,696 GHz（在11.2 GHz），谐振频率温度系数τf为- 55 ppm/℃。通过制备lmp - tio2复合陶瓷，降低了较大的负τf值。加入tio2使τ从−55 ppm/°C降低到+26.8 ppm/°C，并且不会引起介电性能的严重退化。在875℃下烧结4 h的tio2含量为19wt %的陶瓷具有优异的性能：εr= 12.3, Q ×f= 38671 GHz, τf= 6.7 ppm/℃。此外，该材料具有与银的化学相容性，使其成为LTCC应用的非常有前途的候选材料。
The microwave dielectric properties and the microstructures of LiMnPO4-TiO2composite ceramics prepared by solid-state reaction method have been investigated. The results show that the pure LiMnPO4(LMP) ceramic can be sintered at 750 °C for 4 h and has a relative permittivity (εr) of 6.7 and high quality factor (Q ×f) of 41,696 GHz (at 11.2 GHz) with a temperature coefficient of resonant frequency (τf) of −55 ppm/°C. The relatively large negative τfvalue is lowered by preparing LMP-TiO2composite ceramics. Adding TiO2lowers τffrom −55 to +26.8 ppm/°C, and does not induce much degradation of dielectric properties. Typically, the 19 wt% TiO2-added ceramic sintered at 875 °C for 4 h exhibits excellent properties of εr= 12.3, Q ×f= 38,671 GHz, τf= 6.7 ppm/°C. Moreover, this material has a chemical compatibility with silver, making it a very promising candidate material for LTCC applications.