NON-CONVERGENT ORDERING AND DISPLACIVE PHASE TRANSITION IN PIGEONITE: IN SITU HT XRD STUDY
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dc.contributor.author | Camara F. | |
dc.contributor.author | Carpenter M.A. | |
dc.contributor.author | Domeneghetti M.C. | |
dc.contributor.author | Tazzoli V. | |
dc.date.accessioned | 2021-06-03T06:25:18Z | |
dc.date.available | 2021-06-03T06:25:18Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=1357694 | |
dc.identifier.citation | Physics and Chemistry of Minerals, 2002, 29, 5, 331-340 | |
dc.identifier.issn | 0342-1791 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/28787 | |
dc.description.abstract | A natural Ca-rich pigeonite (En47Fs43Wo10), free of augite exsolution products, was studied by in situ high-temperature single-crystal X-ray diffraction. The sample, monoclinic P21/c (a=9.719(7) A, b=8.947(9) A, c=5.251(3) A, β=108.49(5), V=433.0(6) A3), was annealed up to 1000 °C to induce a phase transition from P21/c to C2/c symmetry. Complete single-crystal X-ray diffraction data collections were carried out in situ at 650, 750, 850 and 950 °C after the crystal had reached equilibrium for the Fe-Mg intracrystalline exchange reaction at each temperature. The variation, with increasing temperature, of lattice parameters, of intensity of hkl reflections with h + k=2n + 1 (which vanish at high temperature) and of some geometrical parameters from structure refinement, showed that the displacive phase transition P21/c ⇆ C2/c was continuous in character. This contrasts with the first-order character for the HT phase transition in pigeonite containing significantly less calcium. | |
dc.subject | PIGEONITE | |
dc.subject | IN SITU HT-XRD | |
dc.subject | PHASE TRANSITION | |
dc.subject | ORDER-DISORDER | |
dc.title | NON-CONVERGENT ORDERING AND DISPLACIVE PHASE TRANSITION IN PIGEONITE: IN SITU HT XRD STUDY | |
dc.type | Статья |
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