Determination of gibbs energies of formation of the Ca-Pt-O compounds from electromotive force method using CaF2 as solid electrolyte

Hiroyuki Fukuyama; Keiichi Shimizu; Kazuhiro Nagata

doi:10.1515/HTMP.2004.23.5-6.335

Determination of gibbs energies of formation of the Ca-Pt-O compounds from electromotive force method using CaF₂ as solid electrolyte

Hiroyuki Fukuyama, Keiichi Shimizu, Kazuhiro Nagata

Center for Mineral Processing and Metallurgy (CMPM)

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

4 Citations (Scopus)

Abstract

The standard Gibbs energy changes for the following reactions have been directly determined from electromotive force (EMF) measurements using CaF ₂ as the solid electrolyte at elevated temperatures. Pt(s) + 4CaO(s) + O₂(g) = Ca₄PtO₆(s) Δ_rG°/ kJ = -218.5 + 0.1599T (± 0.3) (1273-1313 K) Pt(s) + CaO(s) + O ₂(g) = CaPtO₃(s) Δ_rG°/kJ = -296.8 + 0.2490T (± 0.6) (1123-1173 K) From the preceding results, the standard Gibbs energies of formation of Ca₄PtO₆ and CaPtO ₃ have been evaluated as Δ_fG° (Ca ₄PtO₆)/kJmol^-1 = -2790.1 + 0.6055 T (± 3.5) (1273-1313 K) Δ_fG° (CaPtO₃)/kJmol ^-1 = -939.7 + 0.3604 T(± 0.88) (1123-1173 K). The phase diagram for the Ca-Pt-O system has been constructed based on the thermodynamic data obtained in the present study.

Original language	English
Pages (from-to)	335-341
Number of pages	7
Journal	High Temperature Materials and Processes
Volume	23
Issue number	5-6
DOIs	https://doi.org/10.1515/HTMP.2004.23.5-6.335
Publication status	Published - 2004

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Physical and Theoretical Chemistry

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@article{c4da6700eeae4749b46e8c3df44a8303,

title = "Determination of gibbs energies of formation of the Ca-Pt-O compounds from electromotive force method using CaF2 as solid electrolyte",

abstract = "The standard Gibbs energy changes for the following reactions have been directly determined from electromotive force (EMF) measurements using CaF 2 as the solid electrolyte at elevated temperatures. Pt(s) + 4CaO(s) + O2(g) = Ca4PtO6(s) ΔrG°/ kJ = -218.5 + 0.1599T (± 0.3) (1273-1313 K) Pt(s) + CaO(s) + O 2(g) = CaPtO3(s) ΔrG°/kJ = -296.8 + 0.2490T (± 0.6) (1123-1173 K) From the preceding results, the standard Gibbs energies of formation of Ca4PtO6 and CaPtO 3 have been evaluated as ΔfG° (Ca 4PtO6)/kJmol-1 = -2790.1 + 0.6055 T (± 3.5) (1273-1313 K) ΔfG° (CaPtO3)/kJmol -1 = -939.7 + 0.3604 T(± 0.88) (1123-1173 K). The phase diagram for the Ca-Pt-O system has been constructed based on the thermodynamic data obtained in the present study.",

author = "Hiroyuki Fukuyama and Keiichi Shimizu and Kazuhiro Nagata",

year = "2004",

doi = "10.1515/HTMP.2004.23.5-6.335",

language = "English",

volume = "23",

pages = "335--341",

journal = "High Temperature Materials and Processes",

issn = "0334-6455",

publisher = "Walter de Gruyter GmbH",

number = "5-6",

}

TY - JOUR

T1 - Determination of gibbs energies of formation of the Ca-Pt-O compounds from electromotive force method using CaF2 as solid electrolyte

AU - Fukuyama, Hiroyuki

AU - Shimizu, Keiichi

AU - Nagata, Kazuhiro

PY - 2004

Y1 - 2004

N2 - The standard Gibbs energy changes for the following reactions have been directly determined from electromotive force (EMF) measurements using CaF 2 as the solid electrolyte at elevated temperatures. Pt(s) + 4CaO(s) + O2(g) = Ca4PtO6(s) ΔrG°/ kJ = -218.5 + 0.1599T (± 0.3) (1273-1313 K) Pt(s) + CaO(s) + O 2(g) = CaPtO3(s) ΔrG°/kJ = -296.8 + 0.2490T (± 0.6) (1123-1173 K) From the preceding results, the standard Gibbs energies of formation of Ca4PtO6 and CaPtO 3 have been evaluated as ΔfG° (Ca 4PtO6)/kJmol-1 = -2790.1 + 0.6055 T (± 3.5) (1273-1313 K) ΔfG° (CaPtO3)/kJmol -1 = -939.7 + 0.3604 T(± 0.88) (1123-1173 K). The phase diagram for the Ca-Pt-O system has been constructed based on the thermodynamic data obtained in the present study.

AB - The standard Gibbs energy changes for the following reactions have been directly determined from electromotive force (EMF) measurements using CaF 2 as the solid electrolyte at elevated temperatures. Pt(s) + 4CaO(s) + O2(g) = Ca4PtO6(s) ΔrG°/ kJ = -218.5 + 0.1599T (± 0.3) (1273-1313 K) Pt(s) + CaO(s) + O 2(g) = CaPtO3(s) ΔrG°/kJ = -296.8 + 0.2490T (± 0.6) (1123-1173 K) From the preceding results, the standard Gibbs energies of formation of Ca4PtO6 and CaPtO 3 have been evaluated as ΔfG° (Ca 4PtO6)/kJmol-1 = -2790.1 + 0.6055 T (± 3.5) (1273-1313 K) ΔfG° (CaPtO3)/kJmol -1 = -939.7 + 0.3604 T(± 0.88) (1123-1173 K). The phase diagram for the Ca-Pt-O system has been constructed based on the thermodynamic data obtained in the present study.

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Determination of gibbs energies of formation of the Ca-Pt-O compounds from electromotive force method using CaF₂ as solid electrolyte

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