Measurement of Na<SUB>2</SUB>O Activity in Beta-Alumina by EMF Method

• Itoh Mitsuru

  Department of Metallurgical Engineering, Faculty of Engineering, Osaka University

• Kimura K\={o}hei

  Graduate Student, Osaka University

• Kozuka Zensaku

  Department of Metallurgical Engineering, Faculty of Engineering, Osaka University

抄録

Emf measurements of the following galvanic cells with beta-alumina (β- and β″-alumina) solid electrolyte were carried out to determine the Na₂O activities in the (α+β)- and (β+β″)-alumina:<BR>Pt, Au+Au₂Na(s)/β- or β″-alumina/(α+β)-alumina, Air, Pt<BR>and<BR>Pt, Au+Au₂Na(s)/β″-alumina/(β+β″)-alumina, Air, Pt.<BR>Temperature dependence of the Na₂O activity in the beta-alumina was represented by the following equations:<BR>loga_Na<SUB>2O</SUB>=−0.40–12140(K⁄T)(±0.05), (874–1054 K)<BR>for (α+β)-alumina and<BR>loga_Na<SUB>2O</SUB>=0.85–11380(K⁄T)(±0.09), (823–1075 K)<BR>for (β+β″)-alumina. High temperature stability of the beta-alumina in the SO_x (x=2, 3) and CO₂ atmospheres were investigated using these activity data. Equilibrium sodium vapor pressure over the beta-alumina was represented by the following equations:<BR>log(P_Na⁄P^\ominus)=−22050(K⁄T)+7.68–1⁄4log(P_O<SUB>2</SUB>⁄P^\ominus), (P^\ominus=101325 Pa)<BR>for (α+β)-alumina and<BR>log(P_Na⁄P^\ominus)=−21670(K⁄T)+8.31–1⁄4log(P_O<SUB>2</SUB>⁄P^\ominus)<BR>for (β+β″)-alumina.

収録刊行物

• Transactions of the Japan Institute of Metals

  Transactions of the Japan Institute of Metals 26 (5), 353-361, 1985

  社団法人 日本金属学会

キーワード

• β-alumina
• β″-alumina
• sodium oxide
• activity
• emf method
• sulfur oxide
• carbon dioxide

詳細情報

• CRID: 1390282680095799936
• NII論文ID: 130003486224
• DOI: 10.2320/matertrans1960.26.353
• COI: 1:CAS:528:DyaL2MXks1ShtLY%3D
• ISSN: 24324701
• ISSN: 00214434
• Web Site: https://www.jstage.jst.go.jp/article/matertrans1960/26/5/26_5_353/_pdf
• 本文言語コード: en
• データソース種別:
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