Microwave Dielectric Properties of Ba_nLa_4Ti_<3+n>O_<12+3n> Homologous Series
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概要
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We have investigated the phase structure and microwave dielectric properties of the Ba_nLa_4Ti_<3+n>O_<12+3n> homologous series.In BaLa_4Ti_4O_<15> with n = 1 composition, we obtained high Q characteristics at the dielectric constant εr = 46, the temperature coefficient of the resonant frequency τ_f = - 11ppm/℃ and Q ・ f = 46000GHz. In the BaO-La_2O_3-TiO_2 system, Ba_nLa_4Ti_<3+n>O_<12+3n> compounds exist on the tie line BaTiO_3-La_4Ti_3O_<12> near the tungstenbronze-type like Ba_<6-3x>R_<8+2x>Ti_<18>O_<54> (R = rare earth) solid solutions. There are three kinds of compounds: n = 1, BaLa_4Ti_4O_<15>; n = 2, Ba_2La_4Ti_5O_<18>; and n = 4, Ba_4La_4Ti_7O_<24>. These compounds have a layered hexagonal perovskite-like structure, which has a common subctructure in the crystal structure. We have investigated the phase compositions and microwave dielectric properties of Ba_nLa_4Ti_<3+n>O_<12+3n>. With an increase of n, the dielectric constant, εr, increases and the quality factor, Q ・ f, decreases.
- 社団法人応用物理学会の論文
- 2001-09-30
著者
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OKAWA Takashi
Daiken Chemical Co.
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OHSATO Hitoshi
Department of Materials Science and Engineering Institute of Nagoya Institute of Technology
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OKABE HIROKI
Daiken Kagaku, Co., Ltd.
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Okabe Hiroki
Daiken Chemical Co.
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Ohsato Hitoshi
Department Of Materials Science And Engineering Nagoya Institute Of Technology
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Ohsato Hitoshi
Department Of Materials Science And Engineering Graduate School Of Engineering Nagoya Institute Of T
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KIUCHI Katsumasa
Department of Materials Science and Engineering, Nagoya Institute of Technology
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Kiuchi Katsumasa
Department Of Materials Science And Engineering Nagoya Institute Of Technology
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