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1994 Fiscal Year Final Research Report Summary

Analysis of Electron Conduction Band of Electro-conductive Ceramics by X-ray Absorption

Research Project

Project/Area Number 05805054
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Inorganic materials/Physical properties
Research InstitutionThe University of Tokyo

Principal Investigator

HASHIMOTO Takuya  The University of Tokyo, College of Arts and Sciences, Research Associate, 教養学部, 助手 (20212136)

Project Period (FY) 1993 – 1994
KeywordsBaPb_<1-x>Bi_xO_<3-delta> / Oxygen deficiency / MgIn_2O_4 / X-ray absorption / Thermopower / Thermobalance / Electronic structure / Electronic conductivity
Research Abstract

Electron conduction bands of electro-conductive ceramics, such as MgIn_2O_<4-delta> and BaPb_<1-x>Bi_xO_<3-delta>, were analyzed mainly by X-ray absorption. The former is the newly discovered transparent conductor, and the latter is classical superconducting oxide.
1. Transparent thin film of MgIn_2O_<4-delta> was successfully prepared for the first time. Large progress not only for application but for fundamental research could be made.
2. X-ray absorption of the thin film of MgIn_2O_<4-delta> was measured and pre-edge peak was observed in In-L absorption edge. It was revealed that conduction band consisted mainly of In 5s orbital.
3. Relationship between crystal structure and electronic conduction behavior of BaPb_<1-x>Bi_xO_<3.00> was revealed by X-ray diffraction and electron conduction measurement. Measured X-ray absorption spectroscopy consisted with electronic structure of conduction band, which was deduced from the above clarified relationship.
4. In order to clarify the influence … More of oxygen deficiency on electronic band structure of BaPb_<0.75>Bi_<0.25>O_<3-delta>, X-ray absorption spectroscopes were measured on the samples with various oxygen deficiency, delta. There were little variation in line shape of X-ray absorption by delta, which suggested that variations of electron carrier concentration and orbitals which composed the conduction band were negligible.
5. Besides X-ray absorption, thermobalance, electronic conduction at high temperature and Seebeck coefficient of BaPb_<0.75>Bi_<0.25>O_<3-delta> were measured. It was revealed that oxygen deficiency worked as scattering center rather than electron carrier generation. These results consisted with that of X-ray absorption spectroscopy.
6. Coexistence of electrons with large mobility and holes with low mobility in BaPb_<0.75>Bi_<0.25>O_<3-delta> was revealed from the measurement of temperature dependence of Seebeck coefficients. This information might be useful for the analysis of superconducting transition mechanism. Less

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] H. Un'no et al: "Preparation of MgIn_2O_<4-X> Thin Films on Glass Substmte by RF-Sputering" Jpn. J. Appl. Phys. 32. L1260-L1262 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Hashimoto et al: "Crystal Structure of BaBi_<1-X>Pb_XO_3 and Its Effect on Chemical State of Bi" Rep. Res. Lab. Eng. Mater., TIT. 18. 9-14 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Hashimoto et al.: "Effect of Oxygen-Deficiency on the Structure and Conduction Behavior of BaPb_<0.75>Bi_<0.25>O_<3-δ>" Solid State Commun.87. 251-254 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Hashimoto et al: "Oxygen Deficiency in BaBi_<0.25>Pb_<0.75>O_<3-δ> and Its Effect on the Conduction Behavior and Crystal Structure" Rep. Res. Lab. Eng. Mater., TIT. 19. 19-27 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Hashimoto et al.: "Effect of Substitution of Bi with Pb in BaBi_<1-X>Pb_XO_3 on Crystal Structure and Conduction Behavior" Physica C. 223. 131-139 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Hashimoto et al: "Coexistence of electrons and holes in BaBi_<0.25>Pb_<0.75>O_<3-δ> detected by thermoelecric-power measurement" Phys. Rev. B. 51. 576-580 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Hashimoto et al: "J. Phys. Chem. Solids" Analysis of Role of Oxygen Deficiency on Crystal Structure and Conduction Mechanisin of BaBi_<0.25>Pb_<0.75>O_<3-δ>, ((in press))

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Hashimoto et al: "J. Solid State Chem." Reversible Structural Phase Transition of BaPb_<0.75>Bi_<0.25>O_<3.00> around 360℃, ((in press))

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Un'no et al: "Preparation of MgIn_2O_<4-x> Thin Films on Glass Substrate by RF-Sputtering" Jpn. J.Appl. Phys.vol. 32. L1260-L1262 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Hashimoto et al: "Crystal Structure of BaBi_xPb_<1-x>O_3 and Its Effect on Chemical State of Bi" Rep. Res. Lab. Eng. Mater., TIT.vol. 18. 9-14 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Hashimoto et al: "Effect of Oxygen-Deficiency on the Structure and Conduction Behavior of BaPb_<0.75>Bi_<0.25>O_<3-delta>" Solid State Commun.vol. 87. 251-254 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Hashimoto et al: "Oxygen Deficiency in BaBi_<0.25>Pb_<0.75>O_<3-delta> and Its Effect on the Conduction Behavior and Crystal Structure" Rep. Res. Lab. Eng. Mater., TIT.vol. 19. 19-27 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Hashimoto et al: "Effect of Substitution of Bi with Pb in BaBi_<1-x>Pb_xO_3 on Crystal Structure and Conduction Behavior" Physica C. vol. 223. 131-139 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Hashimoto et al: "Coexistence of Electrons and Holes in BaBi_<0.25>Pb_<0.75>O_<3-delta> Detected by Thermoelectric-power Measurement" Phys. Rev. B.vol. 51. 576-580 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Hashimoto et al: "Analysis of Role of Oxygen Deficiency on Crystal Structure and Conduction Mechanism of BaBi_<0.25>Pb_<0.75>O_<3-delta>" J.Phys. Chem. Solids.(in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Hashimoto et al: "Reversible Structural Phase Transition of BaPb_<0.75>Bi_<0.25>O_<3.00> around 360゚C" J.Solid. State Chem.(inpress).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1996-04-15  

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