Temperature compensated Sr2Al2SiO7 ceramic for microwave applications |
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| Authors: | Kurusaroor M Manu Tony JosephMailadil T Sebastian |
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| Affiliation: | Materials Division, National Institute for Interdisciplinary Science and Technology, CSIR, Thiruvananthapuram 695019, India |
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| Abstract: | The Sr–Gehlenite (Sr2Al2SiO7) ceramic has been prepared by the conventional solid-state ceramic route. Phase pure Sr2Al2SiO7 (SAS) ceramic sintered at 1525 °C for 4 h has ?r = 7.2 and Qu × f = 33,000 GHz. The SAS showed large negative τf of −37.0 ppm/ °C. A low value of τf was achieved by preparing SAS–CaTiO3 composite. The composite with 0.04 volume fractions (Vf) CaTiO3 sintered at 1500 °C for 4 h showed good microwave dielectric properties: ?r = 8.6, Qu × f = 20,400 GHz and τf = +8.5 ppm/°C. |
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| Keywords: | A Ceramics B Sintering C Electron microscopy Microwave dielectric properties X-ray diffraction |
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