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题名: Electrical Properties of the Positive Temperature Coefficient of Resistivity Materials with 490 ° C Critical Temperature
作者: Yen-Yi Lin;Chen-Ti Hu;Horng-Yi Chang;I-Nan Lin
贡献者: 國立臺灣海洋大學:輪機工程學系
日期: 1997-10
上传时间: 2017-01-18T08:05:33Z
出版者: Journal of Applied Physics
摘要: Abstract:This work successfully obtains a positive temperature coefficient of resistivity characteristics with critical temperature (Tc)(Tc) at around 490 and 420 °C for PbTiO3PbTiO3 (PT), and (Pb0.9Sr0.1)TiO3(Pb0.9Sr0.1)TiO3 (PST) materials, respectively. The tetragonality of these materials are (c/a)PT=1.065(c/a)PT=1.065 and (c/a)PST=1.046.(c/a)PST=1.046. In addition, the donor level of Y3+Y3+ ions in PT materials [(Ed)PT=0.09–0.11 eV][(Ed)PT=0.09–0.11 eV] is smaller than that in PST materials [i.e., (Ed)PST=0.29–0.40 eV(Ed)PST=0.29–0.40 eV]. The resistivity jumping ratios of the two materials are similar, that is, (ρmax/ρmin)PT≅102.2(ρmax/ρmin)PT≅102.2 and (ρmax/ρmin)PST≅101.6.(ρmax/ρmin)PST≅101.6. Multiple-TcTc resistivity-temperature (ρ-T)(ρ-T) characteristics are observed, that is ascribed to the formation of an incomplete core-shell microstructure with the Pb-deficient shell not entirely surrounding the stoichiometric core.
關聯: 83(3)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40417
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