Structures and microwave dielectric properties of Ca(1−x)Nd2x/3TiO3 ceramics |
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| Authors: | R. Lowndes F. Azough R. Cernik R. Freer |
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| Affiliation: | 1. School of Materials Science and Engineering, Anhui University of Technology, Maanshan, 243032, PR China;2. Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan, 243002, PR China;1. Department of Electrical Engineering, Tunghai University, Taichung 40704, Taiwan;2. Department of Engineering and Management of Advanced Technology, Chang Jung Christian University, Tainan 71101, Taiwan;1. Electronic Materials & Component Center, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, Republic of Korea;2. Department of Materials Engineering, Kyonggi University, Suwon 16227, Republic of Korea |
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| Abstract: | Ca(1?x)Nd2x/3TiO3 microwave dielectric ceramics were prepared by the mixed oxide route; powders were calcined at 1100 °C and sintered at 1450–1500 °C. High density, single phase products were obtained for all compositions. Grain sizes ranged from 1 μm to 100 μm. There was evidence of significant discontinuous grain growth in mid range compositions; all ceramics were characterised by complex domain structures. With increasing Nd content there was a evidence of a transition from an orthorhombic Pbnm structure to a monoclinic C2/m structure. This was accompanied by a decrease in relative permittivity (?r) from 180 to 78, and decrease in the temperature coefficient of resonant frequency (τf) from +770 ppm K?1 to +200 ppm K?1. The product of dielectric Q value and resonant frequency (Q × f) varied in a grossly non-systematic way, exhibiting a peak at 13,000 GHz in Ca0.7Nd0.2TiO3. |
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