THE HIGH-TEMPERATURE P2/C1-C2/C PHASE TRANSITION IN FE-FREE CA-RICH P21/C CLINOPYROXENES
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dc.contributor.author | Tribaudino M. | |
dc.contributor.author | Nestola F. | |
dc.contributor.author | Meneghini C. | |
dc.contributor.author | Bromiley G.D. | |
dc.date.accessioned | 2022-02-13T04:46:09Z | |
dc.date.available | 2022-02-13T04:46:09Z | |
dc.date.issued | 2003 | |
dc.identifier | https://elibrary.ru/item.asp?id=5108141 | |
dc.identifier.citation | Physics and Chemistry of Minerals, 2003, 30, 9, 527-535 | |
dc.identifier.issn | 0342-1791 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/35279 | |
dc.description.abstract | An in situ, high-temperature, powder diffraction investigation was performed for iron-free clinopyroxenes with compositions Ca0.40Mg1.60Si2O6, Ca0.52Mg1.46Al0.05Si1.98O6, Ca0.59Mg1.41Si2O6 and Ca0.70Mg1.30Si2O6, up to 850 °C using synchrotron radiation (ESRF, Grenoble). In samples with compositions Ca0.52Mg1.46Al0.05Si1.98O6 and Ca0.59Mg1.41Si2O6, evidence of for the P21/c-C2/c displacive phase transition was seen in changes in lattice parameters at T ≈ 550 and 300 °C respectively. Landau modelling of the phase transition behaviour for the sample with composition Ca0.52Mg1.46Al0.05Si1.98O6 shows a tricritical behaviour [Tc=547(16)]. Comparison with the transition behaviour in other samples with lower Ca contents along the join diopside-enstatite indicates that a decrease in Tc, and a switch from first-order to tricritical behavior occurs with increasing Ca content. The change in the transition behaviour was related to an interaction with the antiphase domains at the nanoscale. | |
dc.subject | CLINOPYROXENE | |
dc.subject | IN SITU HT POWDER DIFFRACTION | |
dc.subject | SYNCHROTRON RADIATION | |
dc.subject | PHASE TRANSITION | |
dc.subject | THERMAL EXPANSION | |
dc.title | THE HIGH-TEMPERATURE P2/C1-C2/C PHASE TRANSITION IN FE-FREE CA-RICH P21/C CLINOPYROXENES | |
dc.type | Статья |
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