Forsterite-based Ceramics for Microwave Application with Low Loss and Low Temperature-Coefficient of Relative Permittivity
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概要
- 論文の詳細を見る
The forsterite-based ceramics doped with CaTiO<SUB>3</SUB> and MgAl<SUB>2</SUB>O<SUB>4</SUB> was developed to decrease the temperature dependence of dielectric permittivity. Doping of CaTiO<SUB>3</SUB> into forsterite decreased the temperature coefficient of relative permittivity, TCε, and changed the sign of TCε. When 6mol% and 20mol% of CaTiO<SUB>3</SUB> was doped, the values of TCε were 104 and-129 ppm/K, respectively. However, the values of tan6 increased to 1.8×10<SUP>-3</SUP>, and 3.6×10<SUP>-3</SUP>, respectively, because of the nucleation of titanite crystals with larger dielectric loss. Further addition of MgAl<SUB>2</SUB>O<SUB>4</SUB> lowered the value of tanδ as low as 4×10<SUP>-4</SUP>. The decrease in tand may be attributed to the decomposition of titanite crystals by the reaction between spinel and titanite.
- 社団法人 粉体粉末冶金協会の論文
- 2001-09-15
著者
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SHIBATA Noriyoshi
Japan Fine Ceramics Center
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Higashida Yutaka
Japan Fine Ceramics Center
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ANDO Minato
On leave from NGK Spark Plug Co. Ltd
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