Structural transformation and thermochromic behavior of Co2+-doped Zn3(PO4)2.4H2O hopeites
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | ROBERTSON, Lionel | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | GAUDON, Manuel | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | PÉCHEV, Stanislav | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | DEMOURGUES, Alain | |
| dc.date.issued | 2012 | |
| dc.identifier.issn | 0959-9428 | |
| dc.description.abstractEn | The 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.iso | en | |
| dc.publisher | Royal Society of Chemistry | |
| dc.subject.en | Inorganic compounds | |
| dc.subject.en | Thermochromism | |
| dc.subject.en | Cobalt | |
| dc.subject.en | Crystal strucutre | |
| dc.title.en | Structural transformation and thermochromic behavior of Co2+-doped Zn3(PO4)2.4H2O hopeites | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1039/C2JM14759A | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Journal of Materials Chemistry | |
| bordeaux.page | 3585-3590 | |
| bordeaux.volume | 22 | |
| bordeaux.issue | 8 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00667193 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00667193v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Materials%20Chemistry&rft.date=2012&rft.volume=22&rft.issue=8&rft.spage=3585-3590&rft.epage=3585-3590&rft.eissn=0959-9428&rft.issn=0959-9428&rft.au=ROBERTSON,%20Lionel&GAUDON,%20Manuel&P%C3%89CHEV,%20Stanislav&DEMOURGUES,%20Alain&rft.genre=article |
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