蒸気輸送法による4CaO·P2O5および3CaO·P2O5の標準生成ギブズエネルギーの直接測定
The standard Gibbs energy changes of the following reactions have been measured by using transpiration method; 4CaO∙P2O5(s) + 5C(s) = 4CaO(s) + P2(g) + 5CO(g) ΔGo/kJ = 1624 – 0.953T (± 2.7), (1373 < T/K < 1573) 4(3CaO∙P2O5)(s) + 5C(s) = 3(4CaO∙P2O5)(s) + P2(g) + 5CO(g) ΔGo/kJ = 1946 – 1.193T (...
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| Published in | 鉄と鋼 Vol. 101; no. 3; pp. 169 - 176 |
|---|---|
| Main Authors | , , |
| Format | Journal Article |
| Language | Japanese |
| Published |
一般社団法人 日本鉄鋼協会
2015
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0021-1575 1883-2954 |
| DOI | 10.2355/tetsutohagane.101.169 |
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| Abstract | The standard Gibbs energy changes of the following reactions have been measured by using transpiration method; 4CaO∙P2O5(s) + 5C(s) = 4CaO(s) + P2(g) + 5CO(g) ΔGo/kJ = 1624 – 0.953T (± 2.7), (1373 < T/K < 1573) 4(3CaO∙P2O5)(s) + 5C(s) = 3(4CaO∙P2O5)(s) + P2(g) + 5CO(g) ΔGo/kJ = 1946 – 1.193T (± 0.9), (1448 < T/K < 1523) The standard Gibbs energies of the formation of 4CaO∙P2O5 (ΔGof,(4CaO∙P2O5)) and 3CaO∙P2O5 (ΔGof,(3CaO∙P2O5)) have been derived as follows; ΔGof(4CaO∙P2O5)/kJ mol–1 = – 4765 + 0.965 T, (1373 < T/K < 1573) ΔGof(3CaO∙P2O5)/kJ mol–1 = – 4200 + 0.912 T, (1448 < T/K < 1523) The reasons for discrepancies from reported values were discussed from the view point of whether the activity of phosphorus is measured directly or not. |
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| AbstractList | The standard Gibbs energy changes of the following reactions have been measured by using transpiration method; 4CaO∙P2O5(s) + 5C(s) = 4CaO(s) + P2(g) + 5CO(g) ΔGo/kJ = 1624 – 0.953T (± 2.7), (1373 < T/K < 1573) 4(3CaO∙P2O5)(s) + 5C(s) = 3(4CaO∙P2O5)(s) + P2(g) + 5CO(g) ΔGo/kJ = 1946 – 1.193T (± 0.9), (1448 < T/K < 1523) The standard Gibbs energies of the formation of 4CaO∙P2O5 (ΔGof,(4CaO∙P2O5)) and 3CaO∙P2O5 (ΔGof,(3CaO∙P2O5)) have been derived as follows; ΔGof(4CaO∙P2O5)/kJ mol–1 = – 4765 + 0.965 T, (1373 < T/K < 1573) ΔGof(3CaO∙P2O5)/kJ mol–1 = – 4200 + 0.912 T, (1448 < T/K < 1523) The reasons for discrepancies from reported values were discussed from the view point of whether the activity of phosphorus is measured directly or not. |
| Author | 山末, 英嗣 清水, 謙治 永田, 和宏 |
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| Copyright | 2015 一般社団法人 日本鉄鋼協会 |
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| References_xml | – reference: 15) I. Barin and G. Platzki: Thermochemical data of pure substances, VCH., Westerville, OH, (1995). – reference: 18) M. Iwase, E. Ichise and N. Yamada: Steel Res., 56(1985), 319. – reference: 12) A. Tagaya, F. Tsukihashi and N. Sano: Trans. ISS, 13(1992), 59. – reference: 19) F. Aratani, Y. Omori and K. Sanbongi: Tetsu-to-Hagané, 54(1968), No.2, 143. – reference: 8) S. Shiomi, N. Sano and Y. Matsushita: Tetsu-to-Hagané, 63(1977), No.9, 1520. – reference: 10) J.B. Bookey: J. Iron Steel Inst., 172(1952), No.1, 61. – reference: 16) S. Ban-ya and M. Suzuki: Tetsu-to-Hagané, 61(1975), No.14, 2933. – reference: 2) D. Cordell, A. Rosemarin, J.J. Schröder and A.L. Smit: Chemosphere, 84(2011), No.6, 747. – reference: 13) H. Yama-zoe, E. Ichise, H. Fujiwara and M. Iwase: Trans. ISS, 12(1991), 75. – reference: 20) S. Ban-ya and S. Matoba: Tetsu-to-Hagané, 49(1963), No.4, 666. – reference: 17) M. Yamamoto, K. Yamada, L.L. Meshkov and E. Kato: Tetsu-to-Hagané, 66(1980), No.14, 2032. – reference: 11) M. Iwase, H. Fujiwara, E. Ichise, H. Kitaguchi and K. Ashida: Trans. ISS, 11(1990), 31. – reference: 14) E.M. Levin, C.R. Robbins and H.F. Macmurdie: Phase Diagram for Ceramists. 5 ed., Vol. I, The American Ceramic Society, Westerville, OH, (1985). – reference: 1) D.A. Vaccari: Chemosphere, 84(2011), No.6, 735. – reference: 6) A.J. Poole, D.J. Allington, A.J. Baxter and A.K. Young: Sci. Total Environ., 173-174(1995), 137. – reference: 7) K. Nagata: Kinzoku, 54(1986), 17. – reference: 3) K. Christen: Environ. Sci. & Technol., 41(2007), No.7, 2078. – reference: 9) S. Shiomi, M. Maeda, N. Sano and Y. Matsushita: Tetsu-to-Hagané, 65(1979), No.14, 2032. – reference: 4) P.H. Abelson: Science, 283(1999), No.5410, 2015. – reference: 5) K. Matsubae-Yokoyama, H. Kubo, K. Nakajima and T. Nagasaka: J. Ind. Ecology, 13(2009), No.5, 687. |
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| Snippet | The standard Gibbs energy changes of the following reactions have been measured by using transpiration method; 4CaO∙P2O5(s) + 5C(s) = 4CaO(s) + P2(g) + 5CO(g)... |
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| SubjectTerms | calcium phosphate phosphorus standard Gibbs energy thermodynamics transpiration method |
| Title | 蒸気輸送法による4CaO·P2O5および3CaO·P2O5の標準生成ギブズエネルギーの直接測定 |
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