ISOTHERMAL EQUATION OF STATE AND COMPRESSIONAL BEHAVIOR OF TETRAGONAL EDINGTONITE
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dc.contributor.author | Gatta G.D. | |
dc.contributor.author | Ballaran T.B. | |
dc.contributor.author | Comodi P. | |
dc.contributor.author | Zanazzi P.F. | |
dc.date.accessioned | 2022-04-11T05:21:39Z | |
dc.date.available | 2022-04-11T05:21:39Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=14296670 | |
dc.identifier.citation | American Mineralogist, 2004, 89, 4, 633-639 | |
dc.identifier.issn | 0003-004X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/37051 | |
dc.description.abstract | The high-pressure (HP) structural evolution of a natural tetragonal edingtonite from Ice River, Canada, was investigated up to 5.1 GPa using in situ single-crystal X-ray diffraction and a diamondanvil cell. The isothermal equation of state was determined. The values of V0, KT0, and K′ refined with a third-order Birch-Murnaghan equation of state (BM-EoS) are V0 = 601.6(3) Å3, KT0 = 59(2) GPa, and K′ = 3.4(8). Under high-pressure conditions the main deformation mechanisms can be described by rotation/kinking of “rigid units,” represented by the 4 = 1 secondary building unit (SBU), due to the tetrahedra tilting. The angle between the SBUs (ϕ) increased from 17.15(8)° at 0.0001 GPa to 20.03(9)° at 4.61 GPa. The bulk structural compression results from the combination of the “soft” behavior of the not fully occupied channels [KT0 = 19(1) GPa for [100]-channels; KT0 = 21(1) GPa for [110]-channels] and of the rigid behavior of the tetrahedral framework. The extra-framework cations do not increase in coordination number within the pressure range investigated. The barium occupancy factors for the Ba1 and Ba2 sites change with increasing pressure. For P > 2.3 GPa the Ba2 site is completely empty, and only the position Ba1 is occupied. | |
dc.subject | edingtonite | |
dc.title | ISOTHERMAL EQUATION OF STATE AND COMPRESSIONAL BEHAVIOR OF TETRAGONAL EDINGTONITE | |
dc.type | Статья |
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