Activities in Na2O-CO2-Sb2O5 melts

Toshiharu Fujisawa; Tadaaki Kuno; Hiroyuki Fukuyama; Shoji Takai; Chikabumi Yamauchi

Activities in Na₂O-CO₂-Sb₂O₅ melts

Toshiharu Fujisawa, Tadaaki Kuno, Hiroyuki Fukuyama, Shoji Takai, Chikabumi Yamauchi

Research output: Contribution to journal › Article › peer-review

Abstract

Activities of NaO_0.5 and Na(CO₃)_0.5 in Na₂O-CO₂-Sb₂O₅ melts were determined at 1423-1523 K by the EMF method, using beta -alumina as a solid electrolyte, over the composition range N≥0.7 {=n_na2O/(n_Na2O/ n_Na2O +n_Sb2O5), n: the number of moles} under various partial pressures of CO₂. The activity of SbO_2.5 was calculated from the activity of NaO_0.5 by integrating the Gibbs-Duhem relation. The partial pressure of CO₂ has a large influence on the activities of the components in the system. The existence of a liquid state miscibility gap is suggested in the Na₂CO₃-rich composition range. The solubility of CO₂ in the melts was also measured at 1523 K. The results of the solubility measurements of CO₂ imply that Na₂CO₂ is decomposed according to the stoichiometric reaction corresponding to the formation of Na₃SbO₄ species in the melts. The activity of Na₃SbO₄ is also discussed.

Original language	English
Pages (from-to)	558-564
Number of pages	7
Journal	Nippon Kinzoku Gakkai-si
Volume	53
Issue number	5
Publication status	Published - 1989 May 1
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys
Materials Chemistry

Cite this

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title = "Activities in Na2O-CO2-Sb2O5 melts",

abstract = "Activities of NaO0.5 and Na(CO3)0.5 in Na2O-CO2-Sb2O5 melts were determined at 1423-1523 K by the EMF method, using beta -alumina as a solid electrolyte, over the composition range N≥0.7 {=nna2O/(nNa2O/ nNa2O +nSb2O5), n: the number of moles} under various partial pressures of CO2. The activity of SbO2.5 was calculated from the activity of NaO0.5 by integrating the Gibbs-Duhem relation. The partial pressure of CO2 has a large influence on the activities of the components in the system. The existence of a liquid state miscibility gap is suggested in the Na2CO3-rich composition range. The solubility of CO2 in the melts was also measured at 1523 K. The results of the solubility measurements of CO2 imply that Na2CO2 is decomposed according to the stoichiometric reaction corresponding to the formation of Na3SbO4 species in the melts. The activity of Na3SbO4 is also discussed.",

author = "Toshiharu Fujisawa and Tadaaki Kuno and Hiroyuki Fukuyama and Shoji Takai and Chikabumi Yamauchi",

year = "1989",

month = may,

day = "1",

language = "English",

volume = "53",

pages = "558--564",

journal = "Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals",

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TY - JOUR

T1 - Activities in Na2O-CO2-Sb2O5 melts

AU - Fujisawa, Toshiharu

AU - Kuno, Tadaaki

AU - Fukuyama, Hiroyuki

AU - Takai, Shoji

AU - Yamauchi, Chikabumi

PY - 1989/5/1

Y1 - 1989/5/1

N2 - Activities of NaO0.5 and Na(CO3)0.5 in Na2O-CO2-Sb2O5 melts were determined at 1423-1523 K by the EMF method, using beta -alumina as a solid electrolyte, over the composition range N≥0.7 {=nna2O/(nNa2O/ nNa2O +nSb2O5), n: the number of moles} under various partial pressures of CO2. The activity of SbO2.5 was calculated from the activity of NaO0.5 by integrating the Gibbs-Duhem relation. The partial pressure of CO2 has a large influence on the activities of the components in the system. The existence of a liquid state miscibility gap is suggested in the Na2CO3-rich composition range. The solubility of CO2 in the melts was also measured at 1523 K. The results of the solubility measurements of CO2 imply that Na2CO2 is decomposed according to the stoichiometric reaction corresponding to the formation of Na3SbO4 species in the melts. The activity of Na3SbO4 is also discussed.

AB - Activities of NaO0.5 and Na(CO3)0.5 in Na2O-CO2-Sb2O5 melts were determined at 1423-1523 K by the EMF method, using beta -alumina as a solid electrolyte, over the composition range N≥0.7 {=nna2O/(nNa2O/ nNa2O +nSb2O5), n: the number of moles} under various partial pressures of CO2. The activity of SbO2.5 was calculated from the activity of NaO0.5 by integrating the Gibbs-Duhem relation. The partial pressure of CO2 has a large influence on the activities of the components in the system. The existence of a liquid state miscibility gap is suggested in the Na2CO3-rich composition range. The solubility of CO2 in the melts was also measured at 1523 K. The results of the solubility measurements of CO2 imply that Na2CO2 is decomposed according to the stoichiometric reaction corresponding to the formation of Na3SbO4 species in the melts. The activity of Na3SbO4 is also discussed.

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AN - SCOPUS:0024664080

SN - 0021-4876

VL - 53

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JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

IS - 5

ER -

Activities in Na₂O-CO₂-Sb₂O₅ melts

Abstract

ASJC Scopus subject areas

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