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Novel physical property induced by a construction of organic cell-type ceramics

Research Project

Project/Area Number 10305057
Research Category

Grant-in-Aid for Scientific Research (A).

Allocation TypeSingle-year Grants
Section一般
Research Field Metal making engineering
Research InstitutionOsaka University

Principal Investigator

OTSUKA-YAO-MATSUO Shinya  Osaka University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (90029299)

Co-Investigator(Kenkyū-buntansha) IZU Noriya  Osaka University, Graduate School of Engineering, Research Assistant, 大学院・工学研究科, 助手 (00304014)
OMATA Takahisa  Osaka University, Graduate School of Engineering, Research Assistant, 大学院・工学研究科, 助手 (80267640)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥38,100,000 (Direct Cost: ¥38,100,000)
Fiscal Year 2000: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1999: ¥8,600,000 (Direct Cost: ¥8,600,000)
Fiscal Year 1998: ¥25,700,000 (Direct Cost: ¥25,700,000)
Keywordsproton dissolution / proton conduction / pyrochlore structure / water vapor dissolution / deuterium effect / spectroscopic analysis / electromotive force / NO_x decomposition / 塩基度 / 固体イオニクス / 内部電流
Research Abstract

Pyrochlore-type oxide La_2Zr_2O_7 doped with Ca^<2+>, Sr^<2+>, Ba^<2+> on its A and B sites, respectively, dissolves proton ; however, the reaction for the dissolution may be different on the point of positive hole depletion. In the present study, the oxides doped with Ca^<2+> on its A and B sites, respectively, annealed under the H_2O and D_2O gases, respectively, were subjected to infrared spectroscopic analysis. For the A-site displaced sample with H_2O treatment, three sharp peaks were observed around 3500 cm^<-1> ; the result was completely different from that for the perovskite-type oxides exhibiting a broad spine which are well known as proton conductor at high temperatures. When done with D_2O treatment, the peaks was shifted toward a lower wave number, i.e., 2500 cm^<-1>, keeping the shape of the peaks. It could be concluded that the spectra detected came from the dissolved proton. For the B-site displaced sample, more than 6 peaks appeared. Dependence of the spectrum strength … More on the water vapor pressure differed obviously between the A-site and B-site displacements. These results have revealed that the mechanism of the proton dissolution are different, i.e., on the point of the positive hole depletion. When the water vapor pressure of the atmosphere was changed, the difference may induce a voltage for the junction of the A-site and B-site displaced oxides. We could confirmed the junction voltage experimentally. Thus, using the mixtures of the A-site and B-site displaced oxides powders, which we call organic cell-type ceramics, we tried the NO_2 decomposition based on the internal voltage induced. An quadruple-pole mass spectrometry was used to measure the NO_2 concentration, evacuating the system ; however, the leak of the system could not be neglected. The final objective of the present works was to construct organic cell-type ceramics by mixing the powders and utilizing the internal voltage among the cell, i.e., boundary, to decompose the NO_x gas. To attain the important subject, improvement on the production way of the fine oxides powder, possibly together with platinum powder, and also the detection technique of NO_x gas have been needed. Less

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] Takahisa OMATA and Shinya OTSUKA-YAO-MATSUO: "Electrical Properties of Proton Conducting Ca^<2+>-doped La_2Zr_2O_7 with a Pyrochlore-type Structure"J.Electrochem.Soc.. 148(印刷中). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Takahisa OMATA and Shinya OTSUKA-YAO-MATSUO: "Electrical properties of Proton Conducting Ca^<2+>-doped La_2Zr_2O_7 with a Pyrochlore-type structure"J.Electrochem.Soc.. vol.148 (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Takahisa CMATA and Shinya OTSUKA-YAO-MATSUO: "Electrical Properties of Proton Conducting Ca^<2+>-doped La_2Zr_2O_7 with a Pyrochlore-type Structure."J.Electrochem.Soc.. (印刷中). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] T. Omata, S. Otsuka-Yao-Matsuo: "Vibrational Spectroscopic and X-Ray Diffraction Studies of Cenum Zirconium Oxider with Co/Zr Composition Ratio=1Prepared by Reduction and Successive Oxidation"J. Solid State Chem.. 147. 573-583 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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