Sintering Behavior and Microwave Dielectric Properties of Low-Permittivity SrMgSi 2 O 6 Ceramic
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https://doi.org/10.1007/s11664-020-08327-z 2020 The Minerals, Metals & Materials Society
Sintering Behavior and Microwave Dielectric Properties of Low-Permittivity SrMgSi2O6 Ceramic XIANJIE ZHOU,1 HUANFU ZHOU,1,2 SANG HU,1 XIAOWEN LUAN,1 JIJI DENG,1 CHENGMING LU,1 SHIXUAN LI,1 KUANGGUO WANG,1 and XIULI CHEN1 1.—Guangxi Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi Key Laboratory in Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, School of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China. 2.—e-mail: [email protected]
Low-permittivity SrMgSi2O6 microwave dielectric ceramics were synthesized via a conventional solid-state reaction method. Further, their sintering behavior as well as structural and microwave dielectric properties were studied. The x-ray diffraction patterns of the SrMgSi2O6 and Sr2MgSi2O7 ceramics were compared; both the samples were confirmed to be tetragonal. Meanwhile, the microwave dielectric properties of the samples were related to their microscopic morphology. In addition, the SrMgSi2O6 ceramics had a low sintering temperature of 1125C; they exhibited good microwave dielectric performances with a relative permittivity of er = 6.7, a quality factor Q 9 f = 25,800 GHz, and temperature coefficient of the resonator frequency sf = 46 ppm/C. Therefore, the ceramics exhibit potential for application in microwave devices. Key words: Low permittivity, SrMgSi2O6, microwave dielectric properties
INTRODUCTION With the rapid development of society, information dissemination, particularly via wireless communication, plays an increasingly important role in everyday lives. Therefore, microwave dielectric materials are crucial and maintain balance in wireless communication. Generally, the common requirements for microwave dielectric materials used in various fields are high quality factor, zero temperature coefficient, and appropriate relative permittivity.1–6 Owing to the booming field of highfrequency wireless communication, the demand for low-relative-permittivity ceramics has increased. Lithium-based ceramics have superior properties, low sintering temperatures, and can be co-fired with silver. However, the volatilization of lithium restricts its further application in devices.7,8 In
(Received December 30, 2019; accepted July 9, 2020)
contrast, silicate-based ceramics have relatively low sintering temperatures, low relative permittivity, and high quality factor, making them suitable for application in microwave devices.9–11 Examples of these ceramics are BaZnSi3O8,12 Mg2SiO4,13 and CaMgSi2O6.14 Recently, Zhang et al.15 reported that Sr2MgSi2O7 ceramic has a tetragonal structure. The ceramic exhibited outstanding microwave dielectric properties with a relative permittivity of er = 6.85, quality factor Q 9 f = 22,530 GHz, and temperature coefficient of the resonator frequency sf = 32
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