Effects of redox processes on oxide ion diffusion in Mg-Al-Fe-O solid solution single crystals.

• Haneda Hajime

  National Institute for Research in Inorganic Materials

• Isobe Mitsumasa

  National Institute for Research in Inorganic Materials

• Ishigaki Takamasa

  National Institute for Research in Inorganic Materials

• Sakaguchi Isao

  Core Research for Evolutional Science and Technology of Japan Science and Technology Corporation, c/o National Institute for Research in Inorganic Materials

• Ichinose Noboru

  School Science and Engineering, Waseda University

Bibliographic Information

Other Title

• Ｍｇ‐Ｆｅ‐Ａｌ‐Ｏ系スピネル固溶体単結晶中の酸素拡散に対する酸化‐還元過程の影響
• Mg Fe Al Oケイ スピネル コヨウタイ タンケッショウ チュウ ノ サンソ カクサン ニ タイスル サンカ カンゲン カテイ ノ エイキョウ

Abstract

Oxide ion diffusivities were evaluated in single crystals of Mg-Al-Fe-O spinel solid solutions. The single crystals were grown by a traveling solvent floating zone technique. The diffusion coefficients of oxide ions were obtained by means of a solid-gas exchange method, using ¹⁸O isotope as tracer. The secondary mass spectrometer was used to measured the oxygen diffusion profiles in solids. Some profiles was not able to be interpreted by a simple error function. These anomalies are considered to be due to oxidizing or reducing process in the single crystals during the oxygen diffusion annealing. Iron ions preferentially diffused to surface during oxygen diffusion annealing in Mg_0.93Al_1.24Fe_0.83O_4+δ-crystals, while Mg_0.91Al_0.72Fe_1.37O_4+δ-crystals have not these behaviors. The resultant diffusion coefficient of Mg_0.91Al_0.72Fe_1.37O_4+δ-crystals were divided two temperature dependence as follows;<BR>D=2.0×10^-1exp(-372(kJ/mol)/RT)cm²⋅s^-1>1530K<BR>D=1.0×10^-7exp(-181(kJ/mol)/RT)cm²⋅s^-1<1530K<BR>This tendency agreed with the polycrystalline data. In these samples it is considered that the oxide ions diffuses through oxygen vacancies.

Journal

• Journal of the Japan Society of Powder and Powder Metallurgy

  Journal of the Japan Society of Powder and Powder Metallurgy 46 (1), 36-47, 1999

  Japan Society of Powder and Powder Metallurgy

Keywords

• Oxide
• Diffusion
• SIMS
• Vacancy mechanism
• Redox process

Details

• CRID: 1390001206307163136
• NII Article ID: 10002053606
• NII Book ID: AN00222724
• DOI: 10.2497/jjspm.46.36
• ISSN: 18809014
• ISSN: 05328799
• NDL BIB ID: 4639557
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4639557
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed