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RISS 인기검색어
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- 저자 : Chishima, Yuji (검색결과 2 건)
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Defect control for polarization switching in BiFeO<sub>3</sub> single crystals
Chishima, Yuji,Noguchi, Yuji,Kitanaka, Yuuki,Miyayama, Masaru IEEE 2010 and Frequency Control Vol.57 No.10
<P>BiFeO<SUB>3</SUB> (BFO) single crystals were grown and the effects of Zn and Mn co-doping on the polarization and leakage current properties were investigated at 25°C for establishing materials design based on defect chemistry. Although Zn doping or Mn doping led to a deterioration in the properties, Zn-Mn co-doping led to a large remanent polarization (36 μC/cm<SUP>2</SUP>), a low coercive field (19 kV/cm), and a relatively low leakage current density (~10<SUP>-8</SUP> A/cm<SUP>2</SUP>). It is proposed that defect dipoles composed of Zn<SUP>2+</SUP> and Mn<SUP>4+</SUP> act as effective nucleation sites for ferroelectric domains during polarization switching in BFO crystals.</P>
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Effects of Acid Deposition on Red Pine Forest in Japan and Korea
OKAZAKI, Masanori,CHISHIMA, Takashi,JOEN, Doo Sik,KIM, Yong Kul,YOO, Jeong Hwan 경희대학교 지구환경연구소 1998 국제세미나 Vol.1998 No.-
Monitoring study has been carried out in Htchioji of Japan and Chunchon of Korea from July 1996 to June 1997 to investigate the effects of acid deposition on soil ecosystems under red pine (Pinus densiflora) by collecting open bulk precipitation, throughfall, stemflow, soil solution and stream water. The weighted mean pH value of open bulk precipitation in study duration was 4.79 for Hachioji and 5.29 for Chunchon respectively, which were called "acid precipitation (rain) ". The total cation plus anion input from open bulk precipitation, throughfall and stemflow were 3.27, 10.74 and 0. 19 kmolcha-lyr-1 in Hachioji, and 2.71, 1.96 and 0.08 kmolcha-16month-1. The input of H^+ to red pine forest from throughfall amounted to 50 % of the input from open bulk precipitation in Hachioji, and 225 % of the input from open hulk precipitation in Chunchon. The weighted mean pH values of soil solution under red pine forest ranged from 5.14 to 6.62 in Hachioji and 4.99 to 6.51 in Chunchon, which markedly lower than the values of soil solution in open bare area with some exceptions.
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