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Structural transformation and thermochromic behavior of Co2+-doped Zn3(PO4)2.4H2O hopeites

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorROBERTSON, Lionel
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGAUDON, Manuel
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorPÉCHEV, Stanislav
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDEMOURGUES, Alain
dc.date.issued2012
dc.identifier.issn0959-9428
dc.description.abstractEnThe thermal history of Co2+-doped hopeite Zn3(PO4)2*4H2O was investigated combining thermogravimetric analyses, X-ray diffraction and UV-Visible spectroscopy. For the two dehydration steps, Zn3(PO4)2*4H2O → Zn3(PO4)2*2H2O → α + δ-Zn3(PO4)2, the temperatures increases linearly with the Co2+ doping rate (130-340 °C). The coexistence of α and δ phases formed after dehydration was explained considering a complex and unusual intergrowth phenomenon. Finally these phases transform into the high temperature stable phase, γ-Zn3(PO4)2, at a temperature also controlled via the Co2+ doping rate (350-900 °C). Both phase transformations are associated with variations of Zn2+/Co2+ local environments, from a distorted octahedral site in hopeite to a distorted tetrahedral site in Zn3(PO4)2*2H2O or α + δ-Zn3(PO4)2 and finally to distorted octahedral/trigonal bipyramid sites in γ-Zn3(PO4)2. The successive changes of the Co2+ coordination induce colour variation from pink (octahedral coordination) to blue (tetrahedral coordination), then violet (5 and 6-fold coordination). Co2+-doped hopeites can so be used as efficient over-heat temperature indicators.
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.subject.enInorganic compounds
dc.subject.enThermochromism
dc.subject.enCobalt
dc.subject.enCrystal strucutre
dc.title.enStructural transformation and thermochromic behavior of Co2+-doped Zn3(PO4)2.4H2O hopeites
dc.typeArticle de revue
dc.identifier.doi10.1039/C2JM14759A
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Materials Chemistry
bordeaux.page3585-3590
bordeaux.volume22
bordeaux.issue8
bordeaux.peerReviewedoui
hal.identifierhal-00667193
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00667193v1
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