THE P21/M ↔ C2/M PHASE TRANSITION IN SYNTHETIC AMPHIBOLE NA NAMG MG5 SI8 O22 (OH)2: THERMODYNAMIC AND CRYSTAL-CHEMICAL EVALUATION
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dc.contributor.author | Cámara F. | |
dc.contributor.author | Oberti R. | |
dc.contributor.author | Iezzi G. | |
dc.contributor.author | Della Ventura G. | |
dc.date.accessioned | 2022-02-17T11:03:56Z | |
dc.date.available | 2022-02-17T11:03:56Z | |
dc.date.issued | 2003 | |
dc.identifier | https://elibrary.ru/item.asp?id=13764775 | |
dc.identifier.citation | Physics and Chemistry of Minerals, 2003, 30, 9, 570-581 | |
dc.identifier.issn | 0342-1791 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/35520 | |
dc.description.abstract | The P21/mC2/m displacive phase transition in the synthetic end-member amphibole Na NaMg Mg5 Si8 O22 (OH)2 has been studied by monitoring changes in unit-cell parameters and the intensities of superlattice reflections at 25–400 C. This amphibole allows investigation of the effects of compositional variations at the A- and B-group sites upon the transition. Polynomial fitting of a 24 Landau potential to the evolution of the order parameter with T yielded a T c of 257 3 C, and Landau coefficients compatible with a second-order transition. Structure refinement of single-crystal data collected at 25, 140, 270 and 370 C allowed modelling of the structural changes as a function of T and symmetry. Crystal-chemical analysis suggests that differences in T c in cummingtonites and in the crystal of this work depend mainly upon the relations between the aggregate ionic radii of the B- and C-group cations. | |
dc.subject | Amphibole | |
dc.subject | HT-XRD | |
dc.subject | Displacive phase transition | |
dc.subject | Synthesis | |
dc.title | THE P21/M ↔ C2/M PHASE TRANSITION IN SYNTHETIC AMPHIBOLE NA NAMG MG5 SI8 O22 (OH)2: THERMODYNAMIC AND CRYSTAL-CHEMICAL EVALUATION | |
dc.type | Статья |
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