Study by thermogravimetry, electrical conductivity and IR spectrometry of the phase transition for manganese cation deficient spinels
Identifieur interne : 000D92 ( Istex/Corpus ); précédent : 000D91; suivant : 000D93Study by thermogravimetry, electrical conductivity and IR spectrometry of the phase transition for manganese cation deficient spinels
Auteurs : B. Gillot ; M. El Guendouzi ; M. Laarj ; P. Tailhades ; A. RoussetSource :
- Journal of Materials Science [ 0022-2461 ] ; 1988-09-01.
Abstract
Abstract: Thermogravimetry, electrical conductivity and IR spectrometry were used to study the crystal structure change of the metastable manganese cation deficient spinels that occur during the oxidation of manganese ions above 500° C. The kinetic of the transformation is found to be governed by a nucleation growth mechanism with an activation energy varying with the amount of Mn3+ ions. The nature of the inversion products depends on the manganese substitution extent. We observe for a substitution extent x<0.72 a phase with a corundum structure which is a solid solution of α-(MnFe)2O3 and for x>0.72 a mixture of two phases α-(MnFe)2O3 + Mn2O3 of orthorhombic structure.
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DOI: 10.1007/BF00551316
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The kinetic of the transformation is found to be governed by a nucleation growth mechanism with an activation energy varying with the amount of Mn3+ ions. The nature of the inversion products depends on the manganese substitution extent. We observe for a substitution extent x<0.72 a phase with a corundum structure which is a solid solution of α-(MnFe)2O3 and for x>0.72 a mixture of two phases α-(MnFe)2O3 + Mn2O3 of orthorhombic structure.</div></front></TEI><istex><corpusName>springer</corpusName><author><json:item><name>B. Gillot</name><affiliations><json:string>Faculté des Sciences Mirande, Laboratoire de Recherches sur la Réactivité des Solides, B.P. 138, 21004, Dijon Cedex, France</json:string></affiliations></json:item><json:item><name>M. El Guendouzi</name><affiliations><json:string>Faculté des Sciences Mirande, Laboratoire de Recherches sur la Réactivité des Solides, B.P. 138, 21004, Dijon Cedex, France</json:string></affiliations></json:item><json:item><name>M. 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We observe for a substitution extent x<0.72 a phase with a corundum structure which is a solid solution of α-(MnFe)2O3 and for x>0.72 a mixture of two phases α-(MnFe)2O3 + Mn2O3 of orthorhombic structure.</p></abstract><textClass><keywords scheme="Journal Subject"><list><head>Chemistry</head><item><term>Polymer Sciences</term></item><item><term>Industrial Chemistry/Chemical Engineering</term></item><item><term>Characterization and Evaluation Materials</term></item><item><term>Mechanics</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="1987-10-05">Created</change><change when="1988-09-01">Published</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2016-09-22">References 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Paul Sabatier</OrgName><OrgAddress><Street>Toulouse III, 118 route de Narbonne</Street><Postcode>31062</Postcode><City>Toulouse Cedex</City><Country>France</Country></OrgAddress></Affiliation></AuthorGroup><Abstract ID="Abs1" Language="En"><Heading>Abstract</Heading><Para>Thermogravimetry, electrical conductivity and IR spectrometry were used to study the crystal structure change of the metastable manganese cation deficient spinels that occur during the oxidation of manganese ions above 500° C. The kinetic of the transformation is found to be governed by a nucleation growth mechanism with an activation energy varying with the amount of Mn<Superscript>3+</Superscript> ions. The nature of the inversion products depends on the manganese substitution extent. We observe for a substitution extent <Emphasis Type="Italic">x</Emphasis><0.72 a phase with a corundum structure which is a solid solution of <Emphasis Type="Italic">α</Emphasis>-(MnFe)<Subscript>2</Subscript>O<Subscript>3</Subscript> and for <Emphasis Type="Italic">x</Emphasis>>0.72 a mixture of two phases <Emphasis Type="Italic">α</Emphasis>-(MnFe)<Subscript>2</Subscript>O<Subscript>3</Subscript> + Mn<Subscript>2</Subscript>O<Subscript>3</Subscript> of orthorhombic structure.</Para></Abstract></ArticleHeader><NoBody></NoBody></Article></Issue></Volume></Journal></Publisher></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Study by thermogravimetry, electrical conductivity and IR spectrometry of the phase transition for manganese cation deficient spinels</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Study by thermogravimetry, electrical conductivity and IR spectrometry of the phase transition for manganese cation deficient spinels</title></titleInfo><name type="personal"><namePart type="given">B.</namePart><namePart type="family">Gillot</namePart><affiliation>Faculté des Sciences Mirande, Laboratoire de Recherches sur la Réactivité des Solides, B.P. 138, 21004, Dijon Cedex, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">M.</namePart><namePart type="family">El Guendouzi</namePart><affiliation>Faculté des Sciences Mirande, Laboratoire de Recherches sur la Réactivité des Solides, B.P. 138, 21004, Dijon Cedex, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">M.</namePart><namePart type="family">Laarj</namePart><affiliation>Faculté des Sciences II, Université Hassan II, Casablanca, Morocco</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">P.</namePart><namePart type="family">Tailhades</namePart><affiliation>Laboratoire de Chimie des Matériaux Inorganiques, Université Paul Sabatier, Toulouse III, 118 route de Narbonne, 31062, Toulouse Cedex, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">A.</namePart><namePart type="family">Rousset</namePart><affiliation>Laboratoire de Chimie des Matériaux Inorganiques, Université Paul Sabatier, Toulouse III, 118 route de Narbonne, 31062, Toulouse Cedex, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="OriginalPaper"></genre><originInfo><publisher>Kluwer Academic Publishers</publisher><place><placeTerm type="text">Dordrecht</placeTerm></place><dateCreated encoding="w3cdtf">1987-10-05</dateCreated><dateIssued encoding="w3cdtf">1988-09-01</dateIssued><copyrightDate encoding="w3cdtf">1988</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">Abstract: Thermogravimetry, electrical conductivity and IR spectrometry were used to study the crystal structure change of the metastable manganese cation deficient spinels that occur during the oxidation of manganese ions above 500° C. The kinetic of the transformation is found to be governed by a nucleation growth mechanism with an activation energy varying with the amount of Mn3+ ions. The nature of the inversion products depends on the manganese substitution extent. We observe for a substitution extent x<0.72 a phase with a corundum structure which is a solid solution of α-(MnFe)2O3 and for x>0.72 a mixture of two phases α-(MnFe)2O3 + Mn2O3 of orthorhombic structure.</abstract><relatedItem type="host"><titleInfo><title>Journal of Materials Science</title></titleInfo><titleInfo type="abbreviated"><title>J Mater Sci</title></titleInfo><genre type="journal" displayLabel="Archive Journal"></genre><originInfo><dateIssued encoding="w3cdtf">1988-09-01</dateIssued><copyrightDate encoding="w3cdtf">1988</copyrightDate></originInfo><subject><genre>Chemistry</genre><topic>Polymer Sciences</topic><topic>Industrial Chemistry/Chemical Engineering</topic><topic>Characterization and Evaluation Materials</topic><topic>Mechanics</topic></subject><identifier type="ISSN">0022-2461</identifier><identifier type="eISSN">1573-4803</identifier><identifier type="JournalID">10853</identifier><identifier type="IssueArticleCount">58</identifier><identifier type="VolumeIssueCount">12</identifier><part><date>1988</date><detail type="volume"><number>23</number><caption>vol.</caption></detail><detail type="issue"><number>9</number><caption>no.</caption></detail><extent unit="pages"><start>3342</start><end>3347</end></extent></part><recordInfo><recordOrigin>Chapman and Hall Ltd., 1988</recordOrigin></recordInfo></relatedItem><identifier type="istex">58020309D601DBEB23FE497E54ACAC44B4663D4B</identifier><identifier type="DOI">10.1007/BF00551316</identifier><identifier type="ArticleID">BF00551316</identifier><identifier type="ArticleID">Art46</identifier><accessCondition type="use and reproduction" contentType="copyright">Chapman and Hall Ltd, 1988</accessCondition><recordInfo><recordContentSource>SPRINGER</recordContentSource><recordOrigin>Chapman and Hall Ltd, 1988</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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|texte= Study by thermogravimetry, electrical conductivity and IR spectrometry of the phase transition for manganese cation deficient spinels
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