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The p-T phase diagram of ammonium hexafluoroaluminate

hal.structure.identifierL.V. Kirensky Institute of Physics
dc.contributor.authorGOREV, Mikhail V.
hal.structure.identifierL.V. Kirensky Institute of Physics
dc.contributor.authorFLEROV, Igor N.
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorTRESSAUD, Alain
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDURAND, Etienne
dc.date.issued2002
dc.identifier.issn0953-8984
dc.description.abstractEnThe heat capacity and the effect of hydrostatic pressure on structural phase transitions in ammonium hexafluoroaluminate, (NH4)3AlF6, have been studied. Two heat capacity anomalies have been found with maxima at T 1 = 218.5 ± 0.5 K and T 2 = 179 ± 2 K. Respective entropy changes of phase transitions are ΔS1 = 15.3 ± 0.5 J mol-1 K-1 and ΔS2 = 2.5 ± 0.5 J mol-1 K-1. It is shown that the p-T phase diagram of this compound is rather complex and contains a triple point (ptp = 0.12 GPa, Ttp = 221 K) and high-pressure phase. The mechanism of transformations and generalized p-T phase diagram for compounds of the (NH4)3MIIIF6 family are discussed within the framework of the rotational order-disorder model.
dc.language.isoen
dc.publisherIOP Publishing
dc.subject.enAmmonium hexafluoroaluminate
dc.subject.enPhase diagrams
dc.title.enThe p-T phase diagram of ammonium hexafluoroaluminate
dc.typeArticle de revue
dc.identifier.doi10.1088/0953-8984/14/25/312
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Physics: Condensed Matter
bordeaux.page6447-6453
bordeaux.volume14
bordeaux.issue25
bordeaux.peerReviewedoui
hal.identifierhal-00818777
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00818777v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Physics:%20Condensed%20Matter&rft.date=2002&rft.volume=14&rft.issue=25&rft.spage=6447-6453&rft.epage=6447-6453&rft.eissn=0953-8984&rft.issn=0953-8984&rft.au=GOREV,%20Mikhail%20V.&FLEROV,%20Igor%20N.&TRESSAUD,%20Alain&DURAND,%20Etienne&rft.genre=article


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