Sintering behavior, phase evolution and microwave dielectric properties of thermally stable Li₂O-3MgO-mTiO₂ ceramics (1≤m≤6)

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• 作者：Huanfu Zhou ; ^{zhouhuanfu@163.com} ; Xianghu Tan ; Jin Huang ; Xiuli Chen
• 关键词：Li2O-MgO-TiO2 ; Dielectrics ; Microwave dielectric properties
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：43
• 期：4
• 页码：3688-3692
• 全文大小：1165 K
• 卷排序：43

文摘

Li2O-3MgO-mTiO2 (1≤m≤6) ceramics were prepared by the solid state reaction method. X-ray diffraction, energy dispersive spectrometer and scanning electron microscopy techniques were used to investigate the phase composition and crystal structure. With increasing m values, the phase structures of ceramics changed as: (Li2Mg3TiO6, m=1)→(Li2Mg3Ti4O12 and Mg2TiO4, m=2,3)→(Li2Mg3Ti4O12, m=4)→(Li2Mg3Ti4O12, MgTiO3 and Li2MgTi3O8, m=5)→(Li2Mg3Ti4O12, MgTiO3, Li2MgTi3O8 and MgTi2O5, m=6). The optimized sintering temperature was lowered from 1275 °C to 1050 °C. When m=5, Li2O-3MgO-5TiO2 ceramics showed good microwave dielectric properties at a wide sintering temperature range of 1000–1200 °C, and the best microwave dielectric properties of Q×f=71,726 GHz, εr=21.9 and τf=−20.9 ppm/°C were obtained at a relatively low sintering temperature of 1050 °C.