Sintering Behavior and Microwave Dielectric Properties of Tricalcium Phosphate Polymorphs
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概要
- 論文の詳細を見る
The phase transformation and sintering behavior of tricalcium phosphate polymorphs [$\beta$- and $\alpha$-Ca3(PO4)2] are investigated using differential thermal analysis, X-ray powder diffraction, and dilatometry. The low-temperature phase, $\beta$-Ca3(PO4)2, can be sintered at 1125 °C prior to phase transformation to $\alpha$-Ca3(PO4)2. However, it is difficult to obtain dense $\alpha$-Ca3(PO4)2 samples owing to volume expansion and subsequent microcrack formation during the transformation of $\beta$-Ca3(PO4)2 to $\alpha$-Ca3(PO4)2. Herein, we develop $\alpha$-Ca3(PO4)2 with a density higher than 97% by microwave heating $\alpha$-Ca3(PO4)2 without any reversible phase transformation. Also, we initially explore the microwave dielectric properties of tricalcium phosphate. Both tricalcium phosphate polymorphs show dielectric constants lower than 10. Of importance is the fact that a dense $\alpha$-Ca3(PO4)2 sample has a high quality factor of 22,000 GHz.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2007-05-15
著者
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Hong Kug
School Of Material Sciences & Engineering Seoul National University
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KIM Jeong-Ryeol
School of Materials Science and Engineering, College of Engineering
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Kim Dong-Wan
Multifunctional Ceramics Research Center, Korea Institute of Science and Technology, Seoul 136-791, Korea
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Ryu Hyun-Seung
R&D Center, Bioalpha Inc., 223-23, Sangdaaewon-dong, Joongwon-gu, Seongnam, Kyonggi, Korea
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Hong Kug
School of Materials Science and Engineering, College of Engineering, Seoul National University, Shillim-dong, san 56-1, Gwanak-gu, Seoul 151-742, Korea
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Cho In-Sun
School of Materials Science and Engineering, College of Engineering, Seoul National University, Shillim-dong, san 56-1, Gwanak-gu, Seoul 151-742, Korea
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Ryu Hyun-Seung
R&D Center, Bioalpha Inc., 223-23, Sangdaaewon-dong, Joongwon-gu, Seongnam, Kyonggi, Korea
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