A closer look into close packing: pentacoordinated silicon in a high-pressure polymorph of danburite

Anna Pakhomova, Elena Bykova, Maxim Bykov, Konstantin Glazyrin, Biliana Gasharova, Hanns-Peter Liermann, Mohamed Mezouar, Liudmila Gorelova, Sergey Krivovichev, Leonid Dubrovinsky

Результат исследований: Научные публикации в периодических изданияхстатьярецензирование

17 Цитирования (Scopus)

Аннотация

Due to their high technological and geological relevance, silicates are one of the most studied classes of inorganic compounds. Under ambient conditions, the silicon in silicates is almost exclusively coordinated by four oxygen atoms, while high-pressure treatment normally results in an increase in the coordination from four-to sixfold. Reported here is a high-pressure single-crystal X-ray diffraction study of danburite, CaB2Si2O8, the first compound showing a step-wise transition of Si coordination from tetrahedral to octahedral through a trigonal bipyramid. Along the compression, the Si2O7 groups of danburite first transform into chains of vertice-sharing SiO5 trigonal bipyramids (danburite-II) and later into chains of edge-sharing SiO6 octahedra (danburite-III). It is suggested that the unusual formation of an SiO5 configuration is a consequence of filling up the pentacoordinated voids in the distorted hexagonal close packing of danburite-II.

Язык оригиналаАнглийский
Страницы (с-по)671-677
Число страниц7
ЖурналIUCrJ
Том4
DOI
СостояниеОпубликовано - сен 2017

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