P-V equation of State, thermal expansion, and P-T stability of synthetic zincochromite (ZnCr2O4 spinel). (Articolo in rivista)

Type
Label
  • P-V equation of State, thermal expansion, and P-T stability of synthetic zincochromite (ZnCr2O4 spinel). (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.2138/am.2005.1755 (literal)
Alternative label
  • Levy D.; Diella V.; Pavese A.; Dapiaggi M.; Sani A. (2005)
    P-V equation of State, thermal expansion, and P-T stability of synthetic zincochromite (ZnCr2O4 spinel).
    in The American mineralogist
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Levy D.; Diella V.; Pavese A.; Dapiaggi M.; Sani A. (literal)
Pagina inizio
  • 1162 (literal)
Pagina fine
  • 1182 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 90 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • Studio ad alta pressione e temperatura delle proprietà elastiche dello spinello sintetico di zinco e cromo. Tali proprietà sono state utilizzate per modellare il campo di stabilità dello spinello rispetto ai suoi ossidi. (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Levy D.- Dipartimento Scienze Mineralogiche e Petrologiche, Università degli Studi di Torino Diella V. - CNR Istituto per la dinamica dei processi ambientali Pavese A. - Dipartimento Scienze della Terra, Università degli Studi di Milano Dapiaggi M. -Dipartimento Scienze della Terra, Università degli Studi di Milano Sani A. - European Synchrotron Radiation Facility, ESRF-F 38043 Grenoble Cedex, France (literal)
Titolo
  • P-V equation of State, thermal expansion, and P-T stability of synthetic zincochromite (ZnCr2O4 spinel). (literal)
Abstract
  • The elastic properties and thermal behavior of synthetic zincochromite (ZnCr2O4) have been studied by combining room-temperature high-pressure (0.0001-21 GPa) synchrotron radiation powder diffraction data with high-temperature (298.1240 K) powder diffraction data. Elastic properties were obtained by fitting two Equations of State (EoS) to the P-V data. A third-order Birch-Murnaghan model, which provides results consistent with those from the Vinet EoS, yields: K0 = 183.1(±3.5) GPa, K' = 7.9(±0.6), K'' =-0.1278 GPa-1 (implied value), at V0 = 577.8221 Å3 (fixed). Zincochromite does not exhibit order-disorder reactions at high temperature in the thermal range explored, in agreement with previous studies. The volume thermal expansion was modeled with ?V = ?0 +?1T +?2/T-2, where only the first coefficient was found to be significant [?0 = 23.0(4) 10-6 K-1]. Above 23 GPa diffraction patterns hint at the onset of a phase transition; the high pressure phase is observed at approximately 30 GPa and exhibits orthorhombic symmetry. The elastic and thermal properties of zincochromite were then used to model by thermodynamic calculations the P-T stability field of ZnCr2O4 with respect to its oxide constituents (Cr2O3 and rocksalt-like ZnO). Spinel is expected to decompose into oxides at about 18 GPa and room temperature, in absence of sluggish kinetics. (literal)
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