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In situ high‐temperature X‐ray diffraction study of the Rb 2 O‐B 2 O 3 glass forming system
Author(s) -
Bubnova R. S.,
Krzhizhanovskaya M. G.,
Polyakova I. G.,
Filatov S. K.
Publication year - 2005
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200410309
Subject(s) - metastability , diffraction , phase diagram , powder diffraction , x ray crystallography , annealing (glass) , crystallography , crystallization , phase (matter) , chemistry , crystal structure , x ray , materials science , analytical chemistry (journal) , physics , optics , metallurgy , organic chemistry , chromatography
The results of X‐ray structural analysis, in situ powder high temperature X‐ray diffraction (HTXRD), DTA and annealing studies are summarized to refine the phase equilibria in the Rb 2 O‐B 2 O 3 system in air. Samples were prepared by solid state reaction as well as by the crystallisation of glasses. Investigations show that, in the latter case, high‐temperature metastable phases crystallise first, and it takes some months to reach phase equilibria. The recent determination of crystal structures of Rb 2 B 4 O 7 , Rb 3 B 7 O 12 , Rb 5 B 19 O 31 , α,β‐RbB 3 O 5 and β‐RbB 5 O 8 along with the HTXRD and DTA study led to substantial revising of the Rb 2 O‐B 2 O 3 phase diagram between the 5‐50 mol. % Rb 2 O compositions. New compounds Rb 3 B 7 O 12 and Rb 5 B 19 O 31 and new phase relations in this connection are presented. The low (α) and high temperature (β) modifications of RbB 3 O 5 were discovered and α⟷β transition is studied in details by powder HTXRD. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)