Premium
Tellurium‐Tantalum Oxides
Author(s) -
Bart J. C. J.,
Petrini G.
Publication year - 1980
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19804650106
Subject(s) - isostructural , tantalum , tellurium , oxide , crystallography , materials science , chemistry , metallurgy , crystal structure
The rather complex mixed oxide system TeO 2 Ta 2 O 5 has been studied by means of x‐ray powder diffraction, at room temperature, using samples prepared in the interval of 500 to 900°C. Four whitish coloured stable mixed oxide phases have been found, corresponding to the formulas 3TeO 2 · Ta 2 O 5 , 7TeO 2 · 3Ta 2 O 5 and 2TeO 2 · Ta 2 O 5 ( in a low and high temperature form). The latter compound is not isostructural with 2TeO 2 V 2 O 5 . Approximate stability ranges are: up to 850°C, 3TeO 2 · Ta 2 O 5 ; 700–900°C, 7TeO 2 · 3Ta 2 O 5 ; 850°C and higher, 2TeO 2 · Ta 2 O 5 ( H ); 700–800°C, 2TeO 2 Ta 2 O 5 ( L ).