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New framework hydrous silicate K 3 Sc[Si 3 O 9 ] · H 2 O related to the high-temperature anhydrous silicate K 3 Ho[Si 3 O 9 ] and symmetry analysis of a phase transition with prediction of structures

New framework hydrous silicate K 3 Sc[Si 3 O 9 ] · H 2 O related to the high-temperature... Abstract Crystals of a new framework silicate K3Sc[Si3O9] · H2O, space group Pm21 n (nonstandard setting of space group Pmn21 = C 2v 7), are obtained under hydrothermal conditions. The structure is determined without preliminary knowledge of the chemical formula. The absolute configuration is determined. The structure is close to that of the high-temperature K3Ho[Si3O9] phase, which was obtained upon the heating of K3HoSi3O8(OH)2. This structural similarity is due to the specific conditions of synthesis and an analogous formula, where holmium is replaced by scandium. A symmetry analysis shows that the high local symmetry of a block (rod) is responsible for the first-order phase transition of both the order-disorder (OD) and displacement type. The number of structures in which the simplest and high-symmetry layers are multiplied by different symmetry elements are predicted. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crystallography Reports Springer Journals

New framework hydrous silicate K 3 Sc[Si 3 O 9 ] · H 2 O related to the high-temperature anhydrous silicate K 3 Ho[Si 3 O 9 ] and symmetry analysis of a phase transition with prediction of structures

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References (9)

Publisher
Springer Journals
Copyright
2013 Pleiades Publishing, Ltd.
ISSN
1063-7745
eISSN
1562-689X
DOI
10.1134/S1063774513040056
Publisher site
See Article on Publisher Site

Abstract

Abstract Crystals of a new framework silicate K3Sc[Si3O9] · H2O, space group Pm21 n (nonstandard setting of space group Pmn21 = C 2v 7), are obtained under hydrothermal conditions. The structure is determined without preliminary knowledge of the chemical formula. The absolute configuration is determined. The structure is close to that of the high-temperature K3Ho[Si3O9] phase, which was obtained upon the heating of K3HoSi3O8(OH)2. This structural similarity is due to the specific conditions of synthesis and an analogous formula, where holmium is replaced by scandium. A symmetry analysis shows that the high local symmetry of a block (rod) is responsible for the first-order phase transition of both the order-disorder (OD) and displacement type. The number of structures in which the simplest and high-symmetry layers are multiplied by different symmetry elements are predicted.

Journal

Crystallography Reports – Springer Journals

Published: Jul 1, 2013

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