THE ROLE OF FLUORIDE IONS IN REDUCTION OXIDATION EQUILIBRIA IN CSCL-KCL-NACL-K2NBF7 MELTS

被引：18

作者：

ALIMOVA, Z

POLYAKOV, E

POLYAKOVA, L

KREMENETSKIY, V

机构：

[1] Institute of Chemistry, Kola Scientific Centre, the Russian Academy of Sciences, Apatity

来源：

JOURNAL OF FLUORINE CHEMISTRY | 1992年 / 59卷 / 02期

关键词：

D O I：

10.1016/S0022-1139(00)82411-2

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The spontaneous reduction of Nb(V) hepta-coordinated fluoro complexes in a n-mixed ligand electrolyte at 973-1073 K has been studied by linear voltammetry (which is highly sensitive to the variation of various oxidation states of Nb in the melt) and also by chemical analysis and ER spectroscopy. As the reaction Nb(V) --> Nb(IV) proceeds, a decrease in the F/Nb mole ratio from the starting value of 7:1 to a final value of 6:1 is observed, the latter corresponding to the presence of only Nb(IV) in the melt. The rate of the Nb(V) --> Nb(IV) reduction process at constant temperature was independent of the initial K2NbF7 concentration and was independent of time. The concentration of fluoride ions present in the system has a considerable influence on this rate.

引用

页码：203 / 210

页数：8

共 10 条

[1]

AGULYANSKIY AI, 1987, 8TH ALL UN S FLUOR C, P25

[2]

ALIMOVA ZA, 1990, ZH PRIKL KHIM, V63, P992

[3] INFRARED-REFLECTION SPECTRA OF MOLTEN FLUORIDE SOLUTIONS - NB (V) IN KF - LIF [J].