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BaO−B 2 O 3 system and its mysterious member Ba 3 B 2 O 6
Author(s) -
Bekker Tatyana B.,
Rashchenko Sergey V.,
Seryotkin Yurii V.,
Kokh Alexander E.,
Davydov Aleksey V.,
Fedorov Pavel P.
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15194
Subject(s) - x ray crystallography , mineralogy , materials science , crystallography , physics , chemistry , optics , diffraction
The first systematic study of the BaO–B 2 O 3 system and barium orthoborate Ba 3 B 2 O 6 (3BaO·B 2 O 3 ) was reported in 1949. Thereafter, the system was repeatedly refined but the structure of Ba 3 B 2 O 6 compound has not been adequately studied yet. In our study we have, for the first time, obtained the crystalline samples of Ba 3 B 2 O 6 . The solved structure ( Pbam , a = 13.5923(4) Å, b = 13.6702(4) Å, c = 14.8894(3) Å) belongs to the class of ‘anti‐zeolite’ borates with a pseudotetragonal [Ba 12 ( BO 3 ) 6 ] 6+ cation pattern which contains channels along the c axis filled with anionic clusters. The Ba 3 B 2 O 6 compound may be regarded as a fluorine‐free end‐member of the Ba 3 ( BO 3 ) 2– x F 3 x solid solution. The BaO–B 2 O 3 phase diagram presented in our study is based on our research and literature data.