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Solid‐state equilibrium relations in the Ternary Systems TeO 2 MoO 3 MoO 2 and TeO 2 MoO 3 Te
Author(s) -
Bart J. C. J.,
Petrini G.,
Giordano N.
Publication year - 1975
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.19754130213
Subject(s) - ternary operation , crystallography , molybdenum , materials science , ternary compound , ternary numeral system , solid solution , chemistry , inorganic chemistry , metallurgy , computer science , programming language
In a study of the solid‐state reactions in the ternary systems TeO 2 MoO 3 MoO 2 and TeO 2 MoO 3 Te, approximately 70 selected compositions were sintered at 550°C to attain equilibrium conditions, and solid‐state equilibrium relations were characterized by x‐ray diffraction. In a large composition range, the interaction of TeO 2 and MoO 3 with the reducing agents MoO 2 or Te leads to the reduced ternary oxide TeMo 4 O 13 (m. p. 748°C), in addition to Te 2 MoO 7 , Te and (intermediate) molybdenum oxides. The compatibility relations for the binary systems TeO 2 MoO 2 and MoO 3 Te are presented for the first time. In the TeO 2 MoO 2 system, three‐phase regions are found: (Te 2 MoO 7 TeO 2 Te) on the TeO 2 and (TeMo 4 O 13 MoO 2 Te) on the MoO 2 ‐rich sides with (TeMo 4 O 13 Te 2 MoO 7 Te) in the intermediate region. In the MoO 3 Te system, three‐phase regions (TeMo 4 O 13 MoO 2 Te), (TeMo 4 O 13 Mo 4 O 11 MoO 2 ) and (TeMo 4 O 13 MoO 3 Mo 4 O 11 ) were detected. TeMo 4 O 13 presents two allotropic forms (α′ for T < 450°C, α for T > 450°C). Both structures have been characterized by I.R. and optical reflectance spectroscopy. Unit cell dimensions are also given.