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CuO의 첨가가 PMN-PT 세라믹스의 유전특성에 미치는 영향
김효태,변재동,김인태,김윤호 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.9
95Pb(Mg1/3Nb2/3)O3-5PbTiO3 (hereinafter designated as 95PMN-5PT) system was prepared by the columbite-precursor method with 2 mol% excess PbO to compensate the PbO loss during thermal process. The amount of CuO was 1~10 mol%, and the effects of CuO addition on the dielectric properties of this system have been investigated. From the microstructures, XRD analysis and dielectric measurements, the solubility limit of CuO in 95PMN-5PT was found to be around 3 mol%. Lattice parameter and Curie temperature were found to be decreased as the amount of CuO increased up to the solubility limit. This result confirmed that the Cu2+-ions substituted the Pb2+-ions. It was revealed that the addition of CuO on 95PMN-5PT promoted the sinterability and properties. The room temperature dielectric constant, the loss factor and the specific resistivity of the specimens processed with optimum conditions were 23000, 1%, and 8$\times$1011Ω.cm, respectively.
金孝台 순천향의과대학 1979 Journal of Soonchunhyang Medical Science Vol.2 No.1
催康의 定議는 身體的으로 精神的으로 사회적으로나 完全히 良好한 狀態를 말하는 것으로 母子의 경우도 同一하다. 從來부터 受胎에서 出生까지는 母體를 重視해서 産科에서 管理하고 胎兒가 出生하면 小兒科에서 管理하므로 母子의 健康管理는 이곳 저곳에서 名名 다스리기 때문에 着謹面에서나 行政面에서 一貫性없는 管理를 하여 왔다.