SINGLE-CRYSTAL X-RAY DIFFRACTION STUDY OF CATION DISTRIBUTION IN MGAL2O4-MGFE2O4 SPINEL SOLID SOLUTION
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dc.contributor.author | Nakatsuka A. | |
dc.contributor.author | Ueno H. | |
dc.contributor.author | Nakayama N. | |
dc.contributor.author | Mizota T. | |
dc.contributor.author | Maekawa H. | |
dc.date.accessioned | 2022-11-07T07:47:47Z | |
dc.date.available | 2022-11-07T07:47:47Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13845004 | |
dc.identifier.citation | Physics and Chemistry of Minerals, 2004, 31, 5, 278-287 | |
dc.identifier.issn | 0342-1791 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/39583 | |
dc.description.abstract | Synthesis experiments in the system MgAl2O4–MgFe2O4 [MgAl2−x Fex O4 (0 ≤ x ≤ 2)] were carried out using a PbF2 flux. The crystalline products synthesized in the compositional range of 0.6 <x ≤ 1.2 consisted of two spinel phases, whereas those synthesized in the compositional ranges of 0.0 ≤ x ≤ 0.6 and 1.2 < x ≤ 2.0 crystallized as single spinel phases. Structure refinements of the spinel single crystals, which grew in the ranges of 0.0 ≤ x ≤ 0.6 and 1.2 < x ≤ 2.0, show that the degree of randomness of cation distribution between A and B sites increases as x approaches the two-phase region. This means that the degree of the size mismatch among Mg2+, Fe3+ and Al3+occupying each equivalent mixing site increases as x approaches the two-phase region. Consequently, if the coexistence of two spinels observed in the intermediate compositions reveals the existence of a miscibility gap at low temperatures, this increase in the degree of the size mismatch among the three cations is suggested as a factor of energetic destabilization to form the miscibility gap. | |
dc.subject | Spinel | |
dc.subject | Solid solution | |
dc.subject | Cation distribution | |
dc.subject | Miscibility gap | |
dc.subject | Single-crystal X-ray diffraction | |
dc.title | SINGLE-CRYSTAL X-RAY DIFFRACTION STUDY OF CATION DISTRIBUTION IN MGAL2O4-MGFE2O4 SPINEL SOLID SOLUTION | |
dc.type | Статья |
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