Synthesis and Crystal Structure of Fluoride K2(Ta0.9I0.1)F7 with the Micro-Isomorphic Substitution in the Ta Cationic Position
Fluoride crystals K 2 (Ta 0.9 I 0.1 )F 7 (sp. gr. Р 2 1 / c ) complementary to the K 2 TaF 7 and K 2 NbF 7 fluoride family have been obtained by hydrothermal synthesis. Their structure contains isolated (TaF 7 ) 2‒ polyhedral blocks, the charge of which is compensated by K + cations located between...
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Published in | Crystallography reports Vol. 67; no. 7; pp. 1122 - 1126 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Moscow
Pleiades Publishing
01.12.2022
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Fluoride crystals K
2
(Ta
0.9
I
0.1
)F
7
(sp. gr.
Р
2
1
/
c
) complementary to the K
2
TaF
7
and K
2
NbF
7
fluoride family have been obtained by hydrothermal synthesis. Their structure contains isolated (TaF
7
)
2‒
polyhedral blocks, the charge of which is compensated by K
+
cations located between them. A small amount of the I
5+
impurity has been found in the Та
5+
site, which is atypical of this pair of elements. An example of such isomorphism is the occurrence of I
5+
in the Ge
4+
site in the K
4
[Ge
0.85
I
0.12
0.03
]Ge
5
O
20
germanate octahedron. The synthesis conditions have led to the separation of the initial components into two phases, fluoride K
2
(Ta
0.9
I
0.1
)F
7
and iodate KIO
3
, without formation of the expected iodate fluorides. |
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ISSN: | 1063-7745 1562-689X |
DOI: | 10.1134/S1063774522070264 |