Phase stability and thermo-elastic behavior of CsAlSiO4 (ABW): A potential nuclear waste disposal material (Articolo in rivista)

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  • Phase stability and thermo-elastic behavior of CsAlSiO4 (ABW): A potential nuclear waste disposal material (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.micromeso.2012.07.010 (literal)
Alternative label
  • G. Diego Gatta, Marco Merlini, Paolo Lotti, Andrea Lausi, Milan Rieder (2012)
    Phase stability and thermo-elastic behavior of CsAlSiO4 (ABW): A potential nuclear waste disposal material
    in Microporous and mesoporous materials (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • G. Diego Gatta, Marco Merlini, Paolo Lotti, Andrea Lausi, Milan Rieder (literal)
Pagina inizio
  • 147 (literal)
Pagina fine
  • 152 (literal)
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  • http://www.sciencedirect.com/science/article/pii/S138718111200426X (literal)
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  • 163 (literal)
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  • 6 (literal)
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  • Scopus (literal)
  • ISI Web of Science (WOS) (literal)
  • Google Scholar (literal)
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  • Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Botticelli 23, I-20133 Milano, Italy CNR-Istituto per la Dinamica dei Processi Ambientali, Milano, Italy Sincrotrone Trieste S.C.p.A. di Interesse Nazionale, Strada Statale 14 km 163.5, I-34149 Basovizza, Trieste, Italy Czech Geological Survey, Geologická 6, 15200 Praha 5, Czech Republic (literal)
Titolo
  • Phase stability and thermo-elastic behavior of CsAlSiO4 (ABW): A potential nuclear waste disposal material (literal)
Abstract
  • The thermo-elastic behavior and the P/T-induced structure evolution of a synthetic CsAlSiO4 [ABW framework type, with Pc21n space group and lattice parameters: a = 9.414(1), b = 5.435(1), c = 8.875(1) Å at room conditions] have been investigated up to 1000 °C (at 0.0001 GPa) and up to 10 GPa (at 20 °C) by means of in-situ synchrotron powder diffraction. No phase transition has been observed within the temperature- and pressure-range investigated. P-V data were fitted with a third-order Birch-Murnaghan Equation of State (BM-EoS), giving: V0 = 457.9(4) Å3, KT0 = 42(1) GPa and K? = 3.9(3) (with a second-order Birch-Murnaghan Equation of State: V0 = 458.1(2) Å3, KT0 = 41.3(3) GPa). The evolution of the \"Eulerian finite strain\" vs. \"normalized stress\" yields Fe(0) = 41.9(5)(1) GPa as intercept values, with an almost horizontal slope of the regression line. The evolution of the lattice parameters with pressure shows a remarkably anisotropic compressional pattern, along with subtle change in the axial elastic behavior along [1 0 0] and [0 1 0] at P > 4 GPa. The elastic parameters calculated with a \"linearized\" BM-EoS are: KT0(a) = 244(11) GPa for the a-axis (K(a)? = 4); KT0(b) = 181(3) GPa for the b-axis (K(b)? = 4), and KT0(c) = 14.5(5) GPa and K(c)? = 2.6(1) for the c-axis. The volume thermal expansion with T was described by the polynomial function: V(T)/V0 = 1 + ?0·T + ?1·T2 = 1 + 3.63(1) × 10-5·T - 3.8(1) × 10-9·T2. The structure reacts, in response to the applied T, by a negative thermal expansion along [1 0 0] (i.e. ?0(a) = -9.97(1) × 10-6 °C-1), almost no expansion along [0 1 0] (i.e. ?0(b) = 0.36(1) × 10-6 °C-1) and a pronounced positive expansion along [0 0 1] (i.e. ?0(c) = 47.46(6) × 10-6 °C-1). The main P/T-induced structure deformation mechanisms, at the atomic level, are discussed. (literal)
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