Structure and microwave dielectric characteristics of lithium-excess Ca0.6Nd0.8/3TiO3/(Li0.5Nd0.5)TiO3 ceramics |
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| Affiliation: | 1. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, Guangxi 541004, PR China;2. School of Materials Science and Engineering, Guangxi University, Nanning, Guangxi 530004, PR China;1. National Engineering Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Jianshe Road, Chengdu 610054, PR China;2. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Jianshe Road, Chengdu 610054, PR China;1. College of Material Science and Engineering, Central South University, Changsha 410083, PR China;2. College of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China;3. Department of Information Engineering, Guilin University of Aerospace Technology, Guilin 541004, PR China |
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| Abstract: | Compositions based on (1?x)Ca0.6Nd8/3TiO3?x(Li1/2Nd1/2)TiO3 + yLi (CNLNTx + yLi, x = 0.30–0.60, y = 0–0.05), suitable for microwave applications have been developed by systematically adding excess lithium in order to tune the microwave dielectric properties and lower sintering temperature. Addition of 0.03 excess-Li simultaneously reduced the sintering temperature and improved the relative density of sintered CNLNTx ceramics. The excess Li addition can compensate the evaporation of Li during sintering process and decrease the secondary phase content. The CNLNTx (x = 0.45) ceramics with 0.03 Li excess sintered at 1190 °C have single phase orthorhombic perovskite structure, together with the optimum combination of microwave dielectric properties of ?r = 129, Q × f = 3600 GHz, τf = 38 ppm/°C. Obviously, excess-Li addition can efficiently decrease the sintering temperature and improve the microwave dielectric properties. The high permittivity and relatively low sintering temperatures of lithium-excess Ca0.6Nd0.8/3TiO3/(Li0.5Nd0.5)TiO3 ceramics are ideal for the development of low cost ultra-small dielectric loaded antenna. |
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| Keywords: | A Electronic materials A Ceramics B Microstructure C X-ray diffraction D Dielectric properties |
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