Standard Gibbs' energy of formation of $ LaFeO_{3} $ and comparison of stability of $ LaMO_{3} $ (M = Mn, Fe, Co or Ni) compounds
Abstract The thermodynamic stability of $ LaFeO_{3} $ at high temperatures is of interest in materials technology. For evaluating the thermodynamic data of $ LaFeO_{3} $, the e.m.f. of the following galvanic cell was studied over the range 1094 to 1299 K: Pt, $ LaFeO_{3} $, Fe, $ La_{2} $$ O_{3} $/1...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Sreedharan, O. M. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
1986 |
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| Schlagwörter: |
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| Anmerkung: |
© Chapman and Hall Ltd. 1986 |
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| Übergeordnetes Werk: |
Enthalten in: Journal of materials science - Kluwer Academic Publishers, 1966, 21(1986), 7 vom: Juli, Seite 2581-2584 |
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| Übergeordnetes Werk: |
volume:21 ; year:1986 ; number:7 ; month:07 ; pages:2581-2584 |
| Links: |
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| DOI / URN: |
10.1007/BF01114311 |
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| 245 | 1 | 0 | |a Standard Gibbs' energy of formation of $ LaFeO_{3} $ and comparison of stability of $ LaMO_{3} $ (M = Mn, Fe, Co or Ni) compounds |
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| 520 | |a Abstract The thermodynamic stability of $ LaFeO_{3} $ at high temperatures is of interest in materials technology. For evaluating the thermodynamic data of $ LaFeO_{3} $, the e.m.f. of the following galvanic cell was studied over the range 1094 to 1299 K: Pt, $ LaFeO_{3} $, Fe, $ La_{2} $$ O_{3} $/15 mol % CaO stabilized $ ZrO_{2} $/FeO, Fe, Pt. For the galvanic cell reaction 1/2 $ La_{2} $$ O_{3} $ + 3/2 FeO ⇌ 1/2Fe + $ LaFeO_{3} $, the standard Gibbs energy change, ΔGr0, was measured to be (ΔGr0±0.34) (kJ)=−22.67−0.011 55T (K) for the passage of 3 F of electricity. From this, the stability of $ LaFeO_{3} $ with respect to $ La_{2} $$ O_{3} $ and FeO as well as with $ La_{2} $$ O_{3} $ and $ Fe_{2} $$ O_{3} $ was computed and compared with other equilibrium measurements on $ LaFeO_{3} $ reported in the literature. In addition, a comparison was made on the stabilities of $ LaMO_{3} $ compounds (where M=Mn, Fe, Co or Ni) with respect to dissociation into $ La_{2} $$ O_{3} $ and MO making use of the published data on other compounds. Likewise a comparison of disproportionation of $ LaFeO_{3} $ and $ LaMO_{3} $ into their respective sesquioxides was also made. | ||
| 650 | 4 | |a Polymer | |
| 650 | 4 | |a Fe2O3 | |
| 650 | 4 | |a Gibbs Energy | |
| 650 | 4 | |a Galvanic Cell | |
| 650 | 4 | |a Energy Change | |
| 700 | 1 | |a Chandrasekharaiah, M. S. |4 aut | |
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10.1007/BF01114311 doi (DE-627)OLC204614032X (DE-He213)BF01114311-p DE-627 ger DE-627 rakwb eng 670 VZ Sreedharan, O. M. verfasserin aut Standard Gibbs' energy of formation of $ LaFeO_{3} $ and comparison of stability of $ LaMO_{3} $ (M = Mn, Fe, Co or Ni) compounds 1986 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Chapman and Hall Ltd. 1986 Abstract The thermodynamic stability of $ LaFeO_{3} $ at high temperatures is of interest in materials technology. For evaluating the thermodynamic data of $ LaFeO_{3} $, the e.m.f. of the following galvanic cell was studied over the range 1094 to 1299 K: Pt, $ LaFeO_{3} $, Fe, $ La_{2} $$ O_{3} $/15 mol % CaO stabilized $ ZrO_{2} $/FeO, Fe, Pt. For the galvanic cell reaction 1/2 $ La_{2} $$ O_{3} $ + 3/2 FeO ⇌ 1/2Fe + $ LaFeO_{3} $, the standard Gibbs energy change, ΔGr0, was measured to be (ΔGr0±0.34) (kJ)=−22.67−0.011 55T (K) for the passage of 3 F of electricity. From this, the stability of $ LaFeO_{3} $ with respect to $ La_{2} $$ O_{3} $ and FeO as well as with $ La_{2} $$ O_{3} $ and $ Fe_{2} $$ O_{3} $ was computed and compared with other equilibrium measurements on $ LaFeO_{3} $ reported in the literature. In addition, a comparison was made on the stabilities of $ LaMO_{3} $ compounds (where M=Mn, Fe, Co or Ni) with respect to dissociation into $ La_{2} $$ O_{3} $ and MO making use of the published data on other compounds. Likewise a comparison of disproportionation of $ LaFeO_{3} $ and $ LaMO_{3} $ into their respective sesquioxides was also made. Polymer Fe2O3 Gibbs Energy Galvanic Cell Energy Change Chandrasekharaiah, M. S. aut Enthalten in Journal of materials science Kluwer Academic Publishers, 1966 21(1986), 7 vom: Juli, Seite 2581-2584 (DE-627)129546372 (DE-600)218324-9 (DE-576)014996774 0022-2461 nnns volume:21 year:1986 number:7 month:07 pages:2581-2584 https://doi.org/10.1007/BF01114311 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_11 GBV_ILN_20 GBV_ILN_23 GBV_ILN_30 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2006 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2057 GBV_ILN_2333 GBV_ILN_4082 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4319 GBV_ILN_4323 GBV_ILN_4700 AR 21 1986 7 07 2581-2584 |
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10.1007/BF01114311 doi (DE-627)OLC204614032X (DE-He213)BF01114311-p DE-627 ger DE-627 rakwb eng 670 VZ Sreedharan, O. M. verfasserin aut Standard Gibbs' energy of formation of $ LaFeO_{3} $ and comparison of stability of $ LaMO_{3} $ (M = Mn, Fe, Co or Ni) compounds 1986 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Chapman and Hall Ltd. 1986 Abstract The thermodynamic stability of $ LaFeO_{3} $ at high temperatures is of interest in materials technology. For evaluating the thermodynamic data of $ LaFeO_{3} $, the e.m.f. of the following galvanic cell was studied over the range 1094 to 1299 K: Pt, $ LaFeO_{3} $, Fe, $ La_{2} $$ O_{3} $/15 mol % CaO stabilized $ ZrO_{2} $/FeO, Fe, Pt. For the galvanic cell reaction 1/2 $ La_{2} $$ O_{3} $ + 3/2 FeO ⇌ 1/2Fe + $ LaFeO_{3} $, the standard Gibbs energy change, ΔGr0, was measured to be (ΔGr0±0.34) (kJ)=−22.67−0.011 55T (K) for the passage of 3 F of electricity. From this, the stability of $ LaFeO_{3} $ with respect to $ La_{2} $$ O_{3} $ and FeO as well as with $ La_{2} $$ O_{3} $ and $ Fe_{2} $$ O_{3} $ was computed and compared with other equilibrium measurements on $ LaFeO_{3} $ reported in the literature. In addition, a comparison was made on the stabilities of $ LaMO_{3} $ compounds (where M=Mn, Fe, Co or Ni) with respect to dissociation into $ La_{2} $$ O_{3} $ and MO making use of the published data on other compounds. Likewise a comparison of disproportionation of $ LaFeO_{3} $ and $ LaMO_{3} $ into their respective sesquioxides was also made. Polymer Fe2O3 Gibbs Energy Galvanic Cell Energy Change Chandrasekharaiah, M. S. aut Enthalten in Journal of materials science Kluwer Academic Publishers, 1966 21(1986), 7 vom: Juli, Seite 2581-2584 (DE-627)129546372 (DE-600)218324-9 (DE-576)014996774 0022-2461 nnns volume:21 year:1986 number:7 month:07 pages:2581-2584 https://doi.org/10.1007/BF01114311 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_11 GBV_ILN_20 GBV_ILN_23 GBV_ILN_30 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2006 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2057 GBV_ILN_2333 GBV_ILN_4082 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4319 GBV_ILN_4323 GBV_ILN_4700 AR 21 1986 7 07 2581-2584 |
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10.1007/BF01114311 doi (DE-627)OLC204614032X (DE-He213)BF01114311-p DE-627 ger DE-627 rakwb eng 670 VZ Sreedharan, O. M. verfasserin aut Standard Gibbs' energy of formation of $ LaFeO_{3} $ and comparison of stability of $ LaMO_{3} $ (M = Mn, Fe, Co or Ni) compounds 1986 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Chapman and Hall Ltd. 1986 Abstract The thermodynamic stability of $ LaFeO_{3} $ at high temperatures is of interest in materials technology. For evaluating the thermodynamic data of $ LaFeO_{3} $, the e.m.f. of the following galvanic cell was studied over the range 1094 to 1299 K: Pt, $ LaFeO_{3} $, Fe, $ La_{2} $$ O_{3} $/15 mol % CaO stabilized $ ZrO_{2} $/FeO, Fe, Pt. For the galvanic cell reaction 1/2 $ La_{2} $$ O_{3} $ + 3/2 FeO ⇌ 1/2Fe + $ LaFeO_{3} $, the standard Gibbs energy change, ΔGr0, was measured to be (ΔGr0±0.34) (kJ)=−22.67−0.011 55T (K) for the passage of 3 F of electricity. From this, the stability of $ LaFeO_{3} $ with respect to $ La_{2} $$ O_{3} $ and FeO as well as with $ La_{2} $$ O_{3} $ and $ Fe_{2} $$ O_{3} $ was computed and compared with other equilibrium measurements on $ LaFeO_{3} $ reported in the literature. In addition, a comparison was made on the stabilities of $ LaMO_{3} $ compounds (where M=Mn, Fe, Co or Ni) with respect to dissociation into $ La_{2} $$ O_{3} $ and MO making use of the published data on other compounds. Likewise a comparison of disproportionation of $ LaFeO_{3} $ and $ LaMO_{3} $ into their respective sesquioxides was also made. Polymer Fe2O3 Gibbs Energy Galvanic Cell Energy Change Chandrasekharaiah, M. S. aut Enthalten in Journal of materials science Kluwer Academic Publishers, 1966 21(1986), 7 vom: Juli, Seite 2581-2584 (DE-627)129546372 (DE-600)218324-9 (DE-576)014996774 0022-2461 nnns volume:21 year:1986 number:7 month:07 pages:2581-2584 https://doi.org/10.1007/BF01114311 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_11 GBV_ILN_20 GBV_ILN_23 GBV_ILN_30 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2006 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2057 GBV_ILN_2333 GBV_ILN_4082 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4319 GBV_ILN_4323 GBV_ILN_4700 AR 21 1986 7 07 2581-2584 |
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10.1007/BF01114311 doi (DE-627)OLC204614032X (DE-He213)BF01114311-p DE-627 ger DE-627 rakwb eng 670 VZ Sreedharan, O. M. verfasserin aut Standard Gibbs' energy of formation of $ LaFeO_{3} $ and comparison of stability of $ LaMO_{3} $ (M = Mn, Fe, Co or Ni) compounds 1986 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Chapman and Hall Ltd. 1986 Abstract The thermodynamic stability of $ LaFeO_{3} $ at high temperatures is of interest in materials technology. For evaluating the thermodynamic data of $ LaFeO_{3} $, the e.m.f. of the following galvanic cell was studied over the range 1094 to 1299 K: Pt, $ LaFeO_{3} $, Fe, $ La_{2} $$ O_{3} $/15 mol % CaO stabilized $ ZrO_{2} $/FeO, Fe, Pt. For the galvanic cell reaction 1/2 $ La_{2} $$ O_{3} $ + 3/2 FeO ⇌ 1/2Fe + $ LaFeO_{3} $, the standard Gibbs energy change, ΔGr0, was measured to be (ΔGr0±0.34) (kJ)=−22.67−0.011 55T (K) for the passage of 3 F of electricity. From this, the stability of $ LaFeO_{3} $ with respect to $ La_{2} $$ O_{3} $ and FeO as well as with $ La_{2} $$ O_{3} $ and $ Fe_{2} $$ O_{3} $ was computed and compared with other equilibrium measurements on $ LaFeO_{3} $ reported in the literature. In addition, a comparison was made on the stabilities of $ LaMO_{3} $ compounds (where M=Mn, Fe, Co or Ni) with respect to dissociation into $ La_{2} $$ O_{3} $ and MO making use of the published data on other compounds. Likewise a comparison of disproportionation of $ LaFeO_{3} $ and $ LaMO_{3} $ into their respective sesquioxides was also made. Polymer Fe2O3 Gibbs Energy Galvanic Cell Energy Change Chandrasekharaiah, M. S. aut Enthalten in Journal of materials science Kluwer Academic Publishers, 1966 21(1986), 7 vom: Juli, Seite 2581-2584 (DE-627)129546372 (DE-600)218324-9 (DE-576)014996774 0022-2461 nnns volume:21 year:1986 number:7 month:07 pages:2581-2584 https://doi.org/10.1007/BF01114311 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_11 GBV_ILN_20 GBV_ILN_23 GBV_ILN_30 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2006 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2057 GBV_ILN_2333 GBV_ILN_4082 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4319 GBV_ILN_4323 GBV_ILN_4700 AR 21 1986 7 07 2581-2584 |
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10.1007/BF01114311 doi (DE-627)OLC204614032X (DE-He213)BF01114311-p DE-627 ger DE-627 rakwb eng 670 VZ Sreedharan, O. M. verfasserin aut Standard Gibbs' energy of formation of $ LaFeO_{3} $ and comparison of stability of $ LaMO_{3} $ (M = Mn, Fe, Co or Ni) compounds 1986 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Chapman and Hall Ltd. 1986 Abstract The thermodynamic stability of $ LaFeO_{3} $ at high temperatures is of interest in materials technology. For evaluating the thermodynamic data of $ LaFeO_{3} $, the e.m.f. of the following galvanic cell was studied over the range 1094 to 1299 K: Pt, $ LaFeO_{3} $, Fe, $ La_{2} $$ O_{3} $/15 mol % CaO stabilized $ ZrO_{2} $/FeO, Fe, Pt. For the galvanic cell reaction 1/2 $ La_{2} $$ O_{3} $ + 3/2 FeO ⇌ 1/2Fe + $ LaFeO_{3} $, the standard Gibbs energy change, ΔGr0, was measured to be (ΔGr0±0.34) (kJ)=−22.67−0.011 55T (K) for the passage of 3 F of electricity. From this, the stability of $ LaFeO_{3} $ with respect to $ La_{2} $$ O_{3} $ and FeO as well as with $ La_{2} $$ O_{3} $ and $ Fe_{2} $$ O_{3} $ was computed and compared with other equilibrium measurements on $ LaFeO_{3} $ reported in the literature. In addition, a comparison was made on the stabilities of $ LaMO_{3} $ compounds (where M=Mn, Fe, Co or Ni) with respect to dissociation into $ La_{2} $$ O_{3} $ and MO making use of the published data on other compounds. Likewise a comparison of disproportionation of $ LaFeO_{3} $ and $ LaMO_{3} $ into their respective sesquioxides was also made. Polymer Fe2O3 Gibbs Energy Galvanic Cell Energy Change Chandrasekharaiah, M. S. aut Enthalten in Journal of materials science Kluwer Academic Publishers, 1966 21(1986), 7 vom: Juli, Seite 2581-2584 (DE-627)129546372 (DE-600)218324-9 (DE-576)014996774 0022-2461 nnns volume:21 year:1986 number:7 month:07 pages:2581-2584 https://doi.org/10.1007/BF01114311 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_11 GBV_ILN_20 GBV_ILN_23 GBV_ILN_30 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2006 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2057 GBV_ILN_2333 GBV_ILN_4082 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4319 GBV_ILN_4323 GBV_ILN_4700 AR 21 1986 7 07 2581-2584 |
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M.</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Standard Gibbs' energy of formation of $ LaFeO_{3} $ and comparison of stability of $ LaMO_{3} $ (M = Mn, Fe, Co or Ni) compounds</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">1986</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">ohne Hilfsmittel zu benutzen</subfield><subfield code="b">n</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Band</subfield><subfield code="b">nc</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="500" ind1=" " ind2=" "><subfield code="a">© Chapman and Hall Ltd. 1986</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Abstract The thermodynamic stability of $ LaFeO_{3} $ at high temperatures is of interest in materials technology. 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Sreedharan, O. M. ddc 670 misc Polymer misc Fe2O3 misc Gibbs Energy misc Galvanic Cell misc Energy Change Standard Gibbs' energy of formation of $ LaFeO_{3} $ and comparison of stability of $ LaMO_{3} $ (M = Mn, Fe, Co or Ni) compounds |
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670 VZ Standard Gibbs' energy of formation of $ LaFeO_{3} $ and comparison of stability of $ LaMO_{3} $ (M = Mn, Fe, Co or Ni) compounds Polymer Fe2O3 Gibbs Energy Galvanic Cell Energy Change |
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ddc 670 misc Polymer misc Fe2O3 misc Gibbs Energy misc Galvanic Cell misc Energy Change |
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ddc 670 misc Polymer misc Fe2O3 misc Gibbs Energy misc Galvanic Cell misc Energy Change |
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Standard Gibbs' energy of formation of $ LaFeO_{3} $ and comparison of stability of $ LaMO_{3} $ (M = Mn, Fe, Co or Ni) compounds |
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Standard Gibbs' energy of formation of $ LaFeO_{3} $ and comparison of stability of $ LaMO_{3} $ (M = Mn, Fe, Co or Ni) compounds |
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standard gibbs' energy of formation of $ lafeo_{3} $ and comparison of stability of $ lamo_{3} $ (m = mn, fe, co or ni) compounds |
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Standard Gibbs' energy of formation of $ LaFeO_{3} $ and comparison of stability of $ LaMO_{3} $ (M = Mn, Fe, Co or Ni) compounds |
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Abstract The thermodynamic stability of $ LaFeO_{3} $ at high temperatures is of interest in materials technology. For evaluating the thermodynamic data of $ LaFeO_{3} $, the e.m.f. of the following galvanic cell was studied over the range 1094 to 1299 K: Pt, $ LaFeO_{3} $, Fe, $ La_{2} $$ O_{3} $/15 mol % CaO stabilized $ ZrO_{2} $/FeO, Fe, Pt. For the galvanic cell reaction 1/2 $ La_{2} $$ O_{3} $ + 3/2 FeO ⇌ 1/2Fe + $ LaFeO_{3} $, the standard Gibbs energy change, ΔGr0, was measured to be (ΔGr0±0.34) (kJ)=−22.67−0.011 55T (K) for the passage of 3 F of electricity. From this, the stability of $ LaFeO_{3} $ with respect to $ La_{2} $$ O_{3} $ and FeO as well as with $ La_{2} $$ O_{3} $ and $ Fe_{2} $$ O_{3} $ was computed and compared with other equilibrium measurements on $ LaFeO_{3} $ reported in the literature. In addition, a comparison was made on the stabilities of $ LaMO_{3} $ compounds (where M=Mn, Fe, Co or Ni) with respect to dissociation into $ La_{2} $$ O_{3} $ and MO making use of the published data on other compounds. Likewise a comparison of disproportionation of $ LaFeO_{3} $ and $ LaMO_{3} $ into their respective sesquioxides was also made. © Chapman and Hall Ltd. 1986 |
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Abstract The thermodynamic stability of $ LaFeO_{3} $ at high temperatures is of interest in materials technology. For evaluating the thermodynamic data of $ LaFeO_{3} $, the e.m.f. of the following galvanic cell was studied over the range 1094 to 1299 K: Pt, $ LaFeO_{3} $, Fe, $ La_{2} $$ O_{3} $/15 mol % CaO stabilized $ ZrO_{2} $/FeO, Fe, Pt. For the galvanic cell reaction 1/2 $ La_{2} $$ O_{3} $ + 3/2 FeO ⇌ 1/2Fe + $ LaFeO_{3} $, the standard Gibbs energy change, ΔGr0, was measured to be (ΔGr0±0.34) (kJ)=−22.67−0.011 55T (K) for the passage of 3 F of electricity. From this, the stability of $ LaFeO_{3} $ with respect to $ La_{2} $$ O_{3} $ and FeO as well as with $ La_{2} $$ O_{3} $ and $ Fe_{2} $$ O_{3} $ was computed and compared with other equilibrium measurements on $ LaFeO_{3} $ reported in the literature. In addition, a comparison was made on the stabilities of $ LaMO_{3} $ compounds (where M=Mn, Fe, Co or Ni) with respect to dissociation into $ La_{2} $$ O_{3} $ and MO making use of the published data on other compounds. Likewise a comparison of disproportionation of $ LaFeO_{3} $ and $ LaMO_{3} $ into their respective sesquioxides was also made. © Chapman and Hall Ltd. 1986 |
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Abstract The thermodynamic stability of $ LaFeO_{3} $ at high temperatures is of interest in materials technology. For evaluating the thermodynamic data of $ LaFeO_{3} $, the e.m.f. of the following galvanic cell was studied over the range 1094 to 1299 K: Pt, $ LaFeO_{3} $, Fe, $ La_{2} $$ O_{3} $/15 mol % CaO stabilized $ ZrO_{2} $/FeO, Fe, Pt. For the galvanic cell reaction 1/2 $ La_{2} $$ O_{3} $ + 3/2 FeO ⇌ 1/2Fe + $ LaFeO_{3} $, the standard Gibbs energy change, ΔGr0, was measured to be (ΔGr0±0.34) (kJ)=−22.67−0.011 55T (K) for the passage of 3 F of electricity. From this, the stability of $ LaFeO_{3} $ with respect to $ La_{2} $$ O_{3} $ and FeO as well as with $ La_{2} $$ O_{3} $ and $ Fe_{2} $$ O_{3} $ was computed and compared with other equilibrium measurements on $ LaFeO_{3} $ reported in the literature. In addition, a comparison was made on the stabilities of $ LaMO_{3} $ compounds (where M=Mn, Fe, Co or Ni) with respect to dissociation into $ La_{2} $$ O_{3} $ and MO making use of the published data on other compounds. Likewise a comparison of disproportionation of $ LaFeO_{3} $ and $ LaMO_{3} $ into their respective sesquioxides was also made. © Chapman and Hall Ltd. 1986 |
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