Nonstoichiometry and reductive decomposition of CaMnO3-delta
The variation of the oxygen stoichiometry of CaMnO3-delta with the partial pressure of oxygen has been measured by coulometric titration at 1223, 1273 and 1373 K, and the technique used is described in some detail. CaMnO3-delta is not stable under reducing conditions; at 1273 K, CaMnO3-delta decompo...
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| Veröffentlicht in: | Solid state ionics 2005-01, Vol.176 (1-2), p.217-223 |
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| creator | Bakken, Egil Norby, Truls Stolen, Svein |
| description | The variation of the oxygen stoichiometry of CaMnO3-delta with the partial pressure of oxygen has been measured by coulometric titration at 1223, 1273 and 1373 K, and the technique used is described in some detail. CaMnO3-delta is not stable under reducing conditions; at 1273 K, CaMnO3-delta decomposes at log(pO2/pO2o)=-1.8 with (3-delta)2.84, under the formation of Ca2MnO4-delta and CaMn2O4. The partial molar enthalpy and entropy of oxidation of CaMnO3-delta are derived for 2.92 > (3-delta) > 2.86. The obtained partial molar enthalpy of oxidation is constant (HO-HOo=-163.5+/-7.5 kJ mol-1) within the estimated uncertainty (twice the standard deviation of the mean), whereas the partial molar entropy of oxidation appears to vary with the oxygen stoichiometry. |
| doi_str_mv | 10.1016/j.ssi.2004.07.001 |
| format | Article |
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CaMnO3-delta is not stable under reducing conditions; at 1273 K, CaMnO3-delta decomposes at log(pO2/pO2o)=-1.8 with (3-delta)2.84, under the formation of Ca2MnO4-delta and CaMn2O4. The partial molar enthalpy and entropy of oxidation of CaMnO3-delta are derived for 2.92 > (3-delta) > 2.86. The obtained partial molar enthalpy of oxidation is constant (HO-HOo=-163.5+/-7.5 kJ mol-1) within the estimated uncertainty (twice the standard deviation of the mean), whereas the partial molar entropy of oxidation appears to vary with the oxygen stoichiometry.</description><identifier>ISSN: 0167-2738</identifier><identifier>DOI: 10.1016/j.ssi.2004.07.001</identifier><language>eng</language><ispartof>Solid state ionics, 2005-01, Vol.176 (1-2), p.217-223</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,777,781,27905,27906</link.rule.ids></links><search><creatorcontrib>Bakken, Egil</creatorcontrib><creatorcontrib>Norby, Truls</creatorcontrib><creatorcontrib>Stolen, Svein</creatorcontrib><title>Nonstoichiometry and reductive decomposition of CaMnO3-delta</title><title>Solid state ionics</title><description>The variation of the oxygen stoichiometry of CaMnO3-delta with the partial pressure of oxygen has been measured by coulometric titration at 1223, 1273 and 1373 K, and the technique used is described in some detail. CaMnO3-delta is not stable under reducing conditions; at 1273 K, CaMnO3-delta decomposes at log(pO2/pO2o)=-1.8 with (3-delta)2.84, under the formation of Ca2MnO4-delta and CaMn2O4. The partial molar enthalpy and entropy of oxidation of CaMnO3-delta are derived for 2.92 > (3-delta) > 2.86. The obtained partial molar enthalpy of oxidation is constant (HO-HOo=-163.5+/-7.5 kJ mol-1) within the estimated uncertainty (twice the standard deviation of the mean), whereas the partial molar entropy of oxidation appears to vary with the oxygen stoichiometry.</description><issn>0167-2738</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><recordid>eNotjL1OwzAYAD2A1FL6AGyZ2Bw-_8R2JBYUAUUqdOleOfYX4SqJQ-wg8fZUgul0NxwhdwxKBkw9nMuUQskBZAm6BGBXZH3pmnItzIrcpHQGACWMWpPHjzimHIP7DHHAPP8UdvTFjH5xOXxj4dHFYYop5BDHInZFY9_Hg6Ae-2xvyXVn-4Tbf27I8eX52Ozo_vD61jzt6cSYyhRNyzm2wLzo2so5qzjjla1qx7RB4V3ValkZa60WXMhaS6P4xYRG47URG3L_t53m-LVgyqchJId9b0eMSzrxWspaKSV-AWL1Sl0</recordid><startdate>20050114</startdate><enddate>20050114</enddate><creator>Bakken, Egil</creator><creator>Norby, Truls</creator><creator>Stolen, Svein</creator><scope>7U5</scope><scope>8FD</scope><scope>L7M</scope></search><sort><creationdate>20050114</creationdate><title>Nonstoichiometry and reductive decomposition of CaMnO3-delta</title><author>Bakken, Egil ; Norby, Truls ; Stolen, Svein</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-p116t-e8b22eb01d3fb5cca62125a59c178e3dc5b7458aaa73234974862aaa37e8d783</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Bakken, Egil</creatorcontrib><creatorcontrib>Norby, Truls</creatorcontrib><creatorcontrib>Stolen, Svein</creatorcontrib><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Solid state ionics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bakken, Egil</au><au>Norby, Truls</au><au>Stolen, Svein</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Nonstoichiometry and reductive decomposition of CaMnO3-delta</atitle><jtitle>Solid state ionics</jtitle><date>2005-01-14</date><risdate>2005</risdate><volume>176</volume><issue>1-2</issue><spage>217</spage><epage>223</epage><pages>217-223</pages><issn>0167-2738</issn><abstract>The variation of the oxygen stoichiometry of CaMnO3-delta with the partial pressure of oxygen has been measured by coulometric titration at 1223, 1273 and 1373 K, and the technique used is described in some detail. CaMnO3-delta is not stable under reducing conditions; at 1273 K, CaMnO3-delta decomposes at log(pO2/pO2o)=-1.8 with (3-delta)2.84, under the formation of Ca2MnO4-delta and CaMn2O4. The partial molar enthalpy and entropy of oxidation of CaMnO3-delta are derived for 2.92 > (3-delta) > 2.86. The obtained partial molar enthalpy of oxidation is constant (HO-HOo=-163.5+/-7.5 kJ mol-1) within the estimated uncertainty (twice the standard deviation of the mean), whereas the partial molar entropy of oxidation appears to vary with the oxygen stoichiometry.</abstract><doi>10.1016/j.ssi.2004.07.001</doi><tpages>7</tpages></addata></record> |
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| title | Nonstoichiometry and reductive decomposition of CaMnO3-delta |
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