Direct Determination of Standard Gibbs Energies of the Formation of 4CaO·P<sub>2</sub>O<sub>5</sub> and 3CaO·P<sub>2</sub>O<sub>5</sub> by Transpiration Method
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- Yamasue Eiji
- Graduate School of Energy Science, Kyoto University
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- Shimizu Kenji
- School of Engineering, Tokyo Institute of Technology
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- Nagata Kazuhiro
- School of Engineering, Tokyo Institute of Technology Professor Emeritus, Tokyo Institute of Technology
Bibliographic Information
- Other Title
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- 蒸気輸送法による4CaO·P<sub>2</sub>O<sub>5</sub>および3CaO·P<sub>2</sub>O<sub>5</sub>の標準生成ギブズエネルギーの直接測定
- 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
- ジョウキ ユソウホウ ニ ヨル 4CaO ・ P ₂ O ₅ オヨビ 3CaO ・ P ₂ O ₅ ノ ヒョウジュン セイセイ ギブズエネルギー ノ チョクセツ ソクテイ
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Abstract
The standard Gibbs energy changes of the following reactions have been measured by using transpiration method;<br> 4CaO∙P2O5(s) + 5C(s) = 4CaO(s) + P2(g) + 5CO(g)<br> ΔGo/kJ = 1624 – 0.953T (± 2.7), (1373 < T/K < 1573)<br> 4(3CaO∙P2O5)(s) + 5C(s) = 3(4CaO∙P2O5)(s) + P2(g) + 5CO(g)<br> ΔGo/kJ = 1946 – 1.193T (± 0.9), (1448 < T/K < 1523)<br> The standard Gibbs energies of the formation of 4CaO∙P2O5 (ΔGof,(4CaO∙P2O5)) and 3CaO∙P2O5 (ΔGof,(3CaO∙P2O5)) have been derived as follows;<br> ΔGof(4CaO∙P2O5)/kJ mol–1 = – 4765 + 0.965 T, (1373 < T/K < 1573)<br> ΔGof(3CaO∙P2O5)/kJ mol–1 = – 4200 + 0.912 T, (1448 < T/K < 1523)<br> The reasons for discrepancies from reported values were discussed from the view point of whether the activity of phosphorus is measured directly or not.
Journal
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- Tetsu-to-Hagane
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Tetsu-to-Hagane 101 (3), 169-176, 2015
The Iron and Steel Institute of Japan
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Details 詳細情報について
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- CRID
- 1390001205126606976
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- NII Article ID
- 130004747810
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- NII Book ID
- AN00151251
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- ISSN
- 18832954
- 00211575
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- NDL BIB ID
- 026196311
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed