Refinement of the mangan-neptunite crystal structure

Результат исследований: Научные публикации в периодических изданияхстатья

1 Цитирования (Scopus)

Аннотация

The crystal structure of mangan-neptunite, a manganese analogue of neptunite, has been refined in two space groups (Cc and C2/c). The mineral is monoclinic, with the correct space group Cc; the unit-cell dimensions are: a = 16.4821(6), b = 12.5195(4), c = 10.0292(3) Å, β = 115.474(1)°, and V = 1868.31 Å3. The crystal structure has been refined to R1 = 0.0307 (wR2 = 0.0901) on the basis of 4892 observed reflections with Fhkl ≥ 4σ Fhkl . The most plausible acentric model is caused by the Ti- and (Fe, Mn, Mg)-ordering in the structure. Ti-octahedrons are strongly distorted and consist of short bond Ti-O (1.7 Å), one long bond (2.2 ̊), and four equal bonds (2.0 ̊). Fe-octahedrons are regularly shaped, with all Fe-O bonds being approximately identical.

Язык оригиналаанглийский
Страницы (с-по)835-838
Число страниц4
ЖурналGeology of Ore Deposits
Том49
Номер выпуска8
DOI
СостояниеОпубликовано - дек 2007

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Предметные области Scopus

  • Геология
  • Геохимия и петрология

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