A new mechanism of anionic substitution in fluoride borates | Zendy

Rashchenko Sergey V. | Zendy; Bekker Tatyana B. | Zendy; Bakakin Vladimir V. | Zendy; Seryotkin Yurii V. | Zendy; Kokh Alexander E. | Zendy; Gille Peter | Zendy; Popov Arthur I. | Zendy; Fedorov Pavel P. | Zendy

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A new mechanism of anionic substitution in fluoride borates

Author(s) -

Rashchenko Sergey V.,

Bekker Tatyana B.,

Bakakin Vladimir V.,

Seryotkin Yurii V.,

Kokh Alexander E.,

Gille Peter,

Popov Arthur I.,

Fedorov Pavel P.

Publication year - 2013

Publication title -

journal of applied crystallography

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.429

H-Index - 162

ISSN - 1600-5767

DOI - 10.1107/s0021889813015756

Subject(s) - boron , fluoride , crystallography , substitution (logic) , chemistry , crystal structure , phase diagram , phase (matter) , stereochemistry , inorganic chemistry , organic chemistry , computer science , programming language

A comprehensive study of the BaF 2 –Ba 3 (BO 3 ) 2 phase diagram has revealed a significant difference between the two intermediate phases Ba 5 (BO 3 ) 3 F and Ba 7 (BO 3 ) 4− y F 2+3 y . The latter exhibited (BO 3 ) 3− ↔ 3F − anionic substitution which, unusually, strongly influences the solidus temperature. A comparison of the Ba 5 (BO 3 ) 3 F and Ba 7 (BO 3 ) 4− y F 2+3 y crystal structures, along with consideration of other compounds demonstrating (BO 3 ) 3− ↔ 3F − isomorphism, allows for the disclosure of the mechanism of (BO 3 ) 3− ↔ 3F − heterovalent anionic substitution in fluoride borates via [(BO 3 )F] 4− tetrahedral groups being replaced by four fluoride anions. No exception to this mechanism has been discovered among all known phases with (BO 3 ) 3− ↔ 3F − substitution.

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