The p-T phase diagram of ammonium hexafluoroaluminate
| hal.structure.identifier | L.V. Kirensky Institute of Physics | |
| dc.contributor.author | GOREV, Mikhail V. | |
| hal.structure.identifier | L.V. Kirensky Institute of Physics | |
| dc.contributor.author | FLEROV, Igor N. | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | TRESSAUD, Alain | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | DURAND, Etienne | |
| dc.date.issued | 2002 | |
| dc.identifier.issn | 0953-8984 | |
| dc.description.abstractEn | The 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.iso | en | |
| dc.publisher | IOP Publishing | |
| dc.subject.en | Ammonium hexafluoroaluminate | |
| dc.subject.en | Phase diagrams | |
| dc.title.en | The p-T phase diagram of ammonium hexafluoroaluminate | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1088/0953-8984/14/25/312 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Journal of Physics: Condensed Matter | |
| bordeaux.page | 6447-6453 | |
| bordeaux.volume | 14 | |
| bordeaux.issue | 25 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00818777 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00818777v1 | |
| bordeaux.COinS | ctx_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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