• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

SOLID IONIC PROPERTIES OF METASTABLE ZrO_2-CeO_2-CeO_<1.5> SOLID SOLUTIONS

Research Project

Project/Area Number 09555225
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Metal making engineering
Research InstitutionOsaka University

Principal Investigator

MATSUO Shinya  Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (90029299)

Co-Investigator(Kenkyū-buntansha) KIMURA Hideo  Yamari Industries LTD., Chief of R&D Section, 企画開発室, 室長
IZU Noriya  Graduate School of Engineering, Research Assistant, 大学院・工学研究科, 助手 (00304014)
OMATA Takahisa  Graduate School of Engineering, Research Assistant, 大学院・工学研究科, 助手 (80267640)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥12,700,000 (Direct Cost: ¥12,700,000)
Fiscal Year 1998: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1997: ¥11,500,000 (Direct Cost: ¥11,500,000)
Keywordsmetastable phase / cerid / zirconia / noble compounds / electric conductivity / solid ionic / electron conduction / fluorite-related structure / 電気伝導性
Research Abstract

In the metal-oxygen system, reduction and successive oxidation of a single phase make possible to prepare various metastable phases ; the oxidation proceeds remaining the cation distribution in the precursor of reduced phase. This principle was applied to ZrO_2 - CeO_2 system, the local atom displacements and solid ionics properties of the noble metastable phases obtained were characterized
The precursors were prepared by reducing the t'-(Ge_<0.5>Zr_<0.5>O_2) phase at T_<de>=873K-1573K.When the precursor with T_<de>=1573K was oxidized at 873 K, a noble metastable kappa-CeZiO_4 phas was obtained in which Ce and Zr are in an ordered arrangement. The oxidation of the precursor with 1173K produced another noble metastable t'_<meta>, -(Ce_<0.5>Z_<0.5>O_2) phase in which Ce and Zr are in an disordered arrangement similar to t'-(Ce_<0.5>, Zr_<0.5>O_2). The distance between Ce-O-Ce ions decreased in the order of t'* t'_<meta> * kappa.
In spite of the same composition : CeZrO_4, the electrical conductivity of the metastable t'_<meta> and kappa phases were found to be fairly larger than that of t'. The results couled be interpreted in terms of the Ce-O-Ce distance, cation distribution, and oxygen displacement. The present results imply that the electrical properties could be controlled by the preparation of metastable phase as well as doping of impurities.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] Noriya IZU et al.: "Oxygen release behavior of Ce_<1-x>Zr_xO_2 powders and apearance of Ce_<8-4y>Zr_<4y>O_<14-8> solid solution in the ZrO_2-CeO_2-C O_<1.5> system" J.Alloys and Compounds. 270. 107-114 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 松尾 伸也: "CeO_2-ZrO_2系中間組成での準安定相の出現を考える" 溶融塩および高温化学. 42・1. 7-25 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Noriya IZU,Takahisa OMATA,and Shinya OTUKA-YAO-MATSUO: "Oxygen release behavior of Ce_<(1-x)>Zr_xO_2 powders and appearance of Ce_<(8-y)>Zr_<4y>O_<(14-delta)> solid solution in the ZrO_2-CeO_2-CeO_<1.5> system" J.Alloys and Compounds. vol.270. 107-114 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Shinya OTSUKA-YAO-MATSUO: "Magical Appearance of Metastable Phases in the Intermediate Composition Range of CeO_2-ZrOo_2 System" Molten Salts. vol.42, no.1. 7-25 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Noriya Izu et al.: "Oxygen release behaviour of Ce_<1-x>Zr_xO_2 powders and appearance of Ce_<x-4y>Zr_<4y>O_<14-δ> Solid solution in the ZrO_2-CeO_2-CeO_<1.5> system" J.Alloys and Compounds. 270. 107-114 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 松尾伸也: "CeO_2-ZrO_2系中間組成での準安定相の出現を考える" 溶融塩および高温化学. 42・1. 7-25 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] N.Izu, T.Omata and S.O.-Yao-M.: "Oxygen Release Behavior of Ce_<1-X>Zr_XO_2 Powders and Appeardnce of Ce_<(8-4y)>Zr_<4y>O_<14-δ> Solid Solution in the ZrO_2-CeO_2-CeO_<1.5> System" J.Alloys & Compounds. (in press). (1998)

    • Related Report
      1997 Annual Research Report

URL: 

Published: 1997-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi