Microwave hybrid sintering of 0.95(Mg0.95Zn0.05)TiO3-0.05CaTiO3 ceramics and its microwave dielectric properties |
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| Affiliation: | 1. Giant Dielectric and Computational Design Research Group (GD–CDR), Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand;2. Synchrotron Light Research Institute (Public Organization), 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand;3. Department of Physics, Hokkaido University, Sapporo 060-0810, Japan;4. Materials Science, School of Mechanical, Industrial & Manufacturing Engineering, Oregon State University, Corvallis, OR 97331, USA;1. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, Jilin, China;2. Key Laboratory of Material Physics of Ministry of Education, School of Physical Engineering, Zhengzhou University, Zhengzhou 450052, Henan, China;1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an 710072, China;2. Institute of Culture and Heritage, Northwestern Polytechnical University, Xi''an 710072, China;1. College of Science, Guilin University of Technology, Guilin 541004, China;2. Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China;3. Key Laboratory of Multifunctional Materials and Structures, Ministry of Education, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China |
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| Abstract: | Microwave dielectric ceramic powder of 0.95(Mg0.95Zn0.05)TiO3-0.05CaTiO3 (MCT) has been prepared by solid-state reaction method through single-step calcination at 1150 °C. The green bodies prepared from the calcined powder have been sintered by conventional, susceptor-aided, and hybrid microwave sintering techniques followed by annealing. XRD of calcined and sintered ceramics show (Mg,Zn)TiO3 as a major phase with CaTiO3 as a minor secondary phase. Fractographs of fired ceramics obtained by SEM show similar features in conventional and hybrid microwave types of sintering. Microwave dielectric properties such as relative permittivity(εr), temperature coefficient of resonant frequency(τf), and unloaded quality factors (Qu) for conventional sintered at 1325 °C for 4 h are—εr~19.8, τf< –6 ppm/°C and Qu.f 69,600 GHz at 6 GHz. Ceramics obtained through susceptor-aided microwave sintering at 1325 °C for 4 h show poor fired density. But ceramics got by microwave-hybrid sintering (resistive + microwave) at the same temperature show εr~20.6, Qu.f~81,600 GHz at 6 GHz and τf~?6.9 ppm/°C. The effect of hybrid microwave sintering on the dielectric properties of MCT ceramics is found to be more subtle than microstructural. |
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| Keywords: | Microwave hybrid sintering Microwave dielectric Microwave assisted sintering Electroceramic |
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