Sintering characteristics and microwave dielectric properties of 0.5Ca0.6La0.267TiO3-0.5Ca(Mg1/3Nb2/3)O3 ceramics prepared by reaction-sintering process
来源期刊：JOURNAL OF RARE EARTHS2018年第4期
论文作者：Jiamao Li Peng Xu Tai Qiu Lichun Yao
文章页码：404 - 408
摘 要：0.5 Ca0.6La0.267TiO3-0.5 Ca(Mg1/3Nb2/3)O3（5 CLT-5 CMN） ceramics were prepared by a reaction-sintering process and their sintering characteristics, microwave dielectric properties were investigated in detail.Without any calcination stage involved,a mixture of CaCO3, La2 O3, TiO2, MgO and Nb2 O5 was pressed and sintered directly. Pure phase 5 CLT-5 CMN ceramics with high density and dense microstructure can be obtained after sintered at 1400 ℃ for 4 h. Compared with those prepared by the conventional ceramic route, 5 CLT-5 CMN ceramics produced by the reaction-sintering process exhibit slightly higher dielectric constant and Q×f value. Fine microwave dielectric properties of εr= 56.4, Q×f= 48,550 GHz and Tf = +8.7 ppm/℃ for 5 CLT-5 CMN ceramics sintered at 1400 ℃ for 4 h are obtained, suggesting reactionsintering process is a simple and efficient method to produce pure phase 5 CLT-5 CMN ceramics as a potential candidate for the fabrication of microwave devices.
Jiamao Li1,2，Peng Xu3，Tai Qiu3，Lichun Yao2,3
1. School of Materials Science and Engineering,Anhui University of Technology2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University3. College of Materials Science and Engineering,Nanjing Tech University
摘 要：0.5 Ca0.6La0.267TiO3-0.5 Ca(Mg1/3Nb2/3)O3（5 CLT-5 CMN） ceramics were prepared by a reaction-sintering process and their sintering characteristics, microwave dielectric properties were investigated in detail.Without any calcination stage involved,a mixture of CaCO3, La2 O3, TiO2, MgO and Nb2 O5 was pressed and sintered directly. Pure phase 5 CLT-5 CMN ceramics with high density and dense microstructure can be obtained after sintered at 1400 ℃ for 4 h. Compared with those prepared by the conventional ceramic route, 5 CLT-5 CMN ceramics produced by the reaction-sintering process exhibit slightly higher dielectric constant and Q×f value. Fine microwave dielectric properties of εr= 56.4, Q×f= 48,550 GHz and Tf = +8.7 ppm/℃ for 5 CLT-5 CMN ceramics sintered at 1400 ℃ for 4 h are obtained, suggesting reactionsintering process is a simple and efficient method to produce pure phase 5 CLT-5 CMN ceramics as a potential candidate for the fabrication of microwave devices.
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