Resistivity Anomaly in Semiconducting BaTiO_3

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概要

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• The phenomenon of positive temperature coefficient of resistivity (PTCR) anomaly has been reexamined in BaTiO_3 with dopings Er and Tb, whose compositions can be expressed by the formulae: Ba_<1-x>Er_xTiO_3 and Ba_<1-x>Tb_xTiO_3. The effect of partial substitution of Ba^<2+> ion by Sr^<2+> and Ca^<2+> on the Curie point is also observed. The composition ranges examined were confined to the region of semiconductivity. Formation of single phase solid solution was checked by an X-ray analysis, using powder photograph method. A theoretical analysis of resistivity anomaly has been given by proposing a new mechanism based on the idea of scattering of an electron by spatial polarization fluctuations. It is found that PTCR anomaly is closely associated with the appearance and disappearance of dipole ordering in ferroelectric systems.

• 社団法人応用物理学会の論文
• 1971-04-05

著者

• Sinha K.

  National Chemical Laboratory

• BRAHMECHA B.

  National Chemical Laboratory

関連論文

• Resistivity Anomaly in Semiconducting BaTiO_3

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