Crystallography Reports
Volume 54, Number 1, 6-12, DOI: 10.1134/S1063774509010027

Structure of Inorganic Compounds

Synthetic Na,Sr-carbonatoborate with a new type of pentaborate layer: The OD nature of the structure and its correlation with volkovskite, veatchites, and hilgardites

E. L. Belokoneva, O. V. Dimitrova and N. N. Mochenova

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Abstract

A new carbonate borate, Sr(Na0.4Sr0.1)Na2[B5O8(OH)2] · (CO3)1 − x , space group B2/b, is synthesized under hydrothermal conditions. A new layered anionic boron-oxygen radical based on the 5[3T + 2Δ] block, which is a component of the framework of the subgroup of triclinic hilgardites, is found in the structure. The structure of the new carbonatoborate is compared with the structures of veatchites, volkovskite, and other layered borates that are based on the 5[2T + 3Δ] block. The OD nature of their structure is shown. The regions responsible for the slight acentricity and disorder along the baxis are revealed in the centrosymmetric model of the new borate.

PACS numbers  61.10.Nz - 61.66.Fn

Original Russian Text © E.L. Belokoneva, O.V. Dimitrova, N.N. Mochenova, 2009, published in Kristallografiya, 2009, Vol. 54, No. 1, pp. 13

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