Тип публикации: статья из журнала

Год издания: 2024

Идентификатор DOI: 10.1134/S0022476624060064

Ключевые слова: tashelgite, mössbauer spectroscopy, optical spectroscopy, spinel, crystal chemistry, XRD.

Аннотация: Rerefinement of the crystal structure of the mineral tashelgite with the idealized formula CaMgFe²⁺Al₉O₁₆(OH) (orthorhombic <i>Pbam</i> space group; <i>a</i> = 17.1823(1), <i>b</i> = 23.5718(4), <i>c</i> = 5.6973(5) Å) is performed using the earlier obtained diffraction data. Fine crystal structure details and distribution features of cation positions are retrieved from precision Mössbauer and optical spectroscopy data. It is shown that the main motif and the pattern of cation distribution over octahedral and tetrahedral positions are preserved, despite the symmetry increase. However, due to a smaller number of independent positions, the distribution in the <i>Pbam</i> model becomes less ordered than in the <i>Pc</i> model. The appearance of tashelgite, having a complex structure based on spinel modules, agrees well with the presence of associated minerals such as spinel-like magnetite and hercynite, as well as hibonite, also containing spinel modules in its structure. A comparative crystal chemical and modular analysis of natural and synthetic compounds containing spinel modules is performed.<img src="/get_item_image.asp?id=68537975&img=10947_2024_2838_Figa_HTML.png" class="img_big">

Журнал: Journal of Structural Chemistry

Выпуск журнала: Т.65, №6

Номера страниц: 1129-1148

ISSN журнала: 00224766

Место издания: Moscow

Издатель: Pleiades Publishing, Ltd.

• Zarubina E.S. (Laboratory of Arctic Mineralogy and Materials Science, Kola Science Centre, Russian Academy of Sciences)
• Rastsvetaeva R.K. (National Research Center “Kurchatov Institute”)
• Rusakov V.S. (Faculty of Physics, Lomonosov Moscow State University)
• Nikolaev A.G. (Institute of Geology and Petroleum Technologies, Kazan Federal University)
• Vagizov F.G. (Institute of Physics, Kazan Federal University)
• Bakhtin A.I. (Institute of Geology and Petroleum Technologies, Kazan Federal University)
• Varlamov D.A. (Institute of Experimental Mineralogy, Russian Academy of Sciences)
• Chukanov N.V. (Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences)
• Ananyev S.A. (Institute of Non-Ferrous Metals and Materials Science , Siberian Federal University)
• Aksenov S.M. (Geological Institute, Kola Science Center, Russian Academy of Sciences)

• Ядро РИНЦ (eLIBRARY.RU)