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BaYb (sub 6) (Si (sub 2) O (sub 7) ) (sub 2) (Si (sub 3) O (sub 10) ); the first silicate containing both Si (sub 2) O (sub 7) and Si (sub 3) O (sub 10) groups; synthesis, crystal chemistry and topology

Maria Wierzbicka-Wieczorek and Uwe Kolitsch
BaYb (sub 6) (Si (sub 2) O (sub 7) ) (sub 2) (Si (sub 3) O (sub 10) ); the first silicate containing both Si (sub 2) O (sub 7) and Si (sub 3) O (sub 10) groups; synthesis, crystal chemistry and topology (in European mineralogical conference 2012, Gerhard Brey (prefacer) and Heidi Hoefer (prefacer))
European Journal of Mineralogy (December 2013) 25 (4): 509-517

Abstract

Colourless crystals of the novel compound BaYb (sub 6) (Si (sub 2) O (sub 7) ) (sub 2) (Si (sub 3) O (sub 10) ) were prepared using a high-temperature flux-growth technique in air. The crystal structure was solved and refined to R(F) = 2.50 % using single-crystal X-ray diffraction data collected at room temperature. The silicate is monoclinic, space group P2 (sub 1) /m (Z = 2), with a = 5.5173(11), b = 27.260(6), c = 6.8150(14) Aa, beta = 106.73(3) degrees , V = 981.6(3) Aa (super 3) . BaYb (sub 6) (Si (sub 2) O (sub 7) ) (sub 2) (Si (sub 3) O (sub 10) ) represents the first silicate containing both (Si (sub 2) O (sub 7) ) and (Si (sub 3) O (sub 10) ) groups in the ratio 2:1 and is isotypic with (NH (sub 4) )Cd (sub 6) (P (sub 2) O (sub 7) ) (sub 2) (P (sub 3) O (sub 10) ). Its framework topology is characterised by one horseshoe-shaped trisilicate (Si (sub 3) O (sub 10) ) group, two symmetrically equivalent (Si (sub 2) O (sub 7) ) groups with the Si-O-Si angle of 165.3 degrees and staggered conformation, and zigzag chains of edge-sharing distorted YbO (sub 6) octahedra (<Yb-O = 2.24 Aa>). The Ba atoms occupy narrow channels extending parallel to [100]. The topological features of BaYb (sub 6) (Si (sub 2) O (sub 7) ) (sub 2) (Si (sub 3) O (sub 10) ) are compared to those of other compounds containing mixed groups (M (sub 2) O (sub 7) ) and (M (sub 3) O (sub 10) ). A similarity to BaY (sub 4) (Si (sub 2) O (sub 7) )(Si (sub 3) O (sub 10) ) is pointed out.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 25
Serial Issue: 4
Title: BaYb (sub 6) (Si (sub 2) O (sub 7) ) (sub 2) (Si (sub 3) O (sub 10) ); the first silicate containing both Si (sub 2) O (sub 7) and Si (sub 3) O (sub 10) groups; synthesis, crystal chemistry and topology
Title: European mineralogical conference 2012
Author(s): Wierzbicka-Wieczorek, MariaKolitsch, Uwe
Author(s): Brey, Gerhardprefacer
Author(s): Hoefer, Heidiprefacer
Affiliation: Friedrich-Schiller-Universitaet Jena, Institut fuer Geowissenschaften, Jena, Germany
Pages: 509-517
Published: 201312
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
Meeting name: European mineralogical conference 2012
Meeting location: Frankfurt, DEU, Germany
Meeting date: 20120902Sept. 2-6, 2012
References: 55
Accession Number: 2014-002388
Categories: Mineralogy of silicates
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
Secondary Affiliation: Naturhistorisches Museum, AUT, Austria
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201403
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