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Phase equilibrium in The TeO 2 Cu 2 O System
Author(s) -
Kozhukharov V.,
Marinov M.,
Pavlova J.
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.19804600122
Subject(s) - differential thermal analysis , monoclinic crystal system , diffraction , powder diffraction , phase (matter) , analytical chemistry (journal) , hexagonal crystal system , optical microscope , materials science , atmospheric pressure , crystallography , mineralogy , chemistry , crystal structure , scanning electron microscope , optics , geology , physics , oceanography , organic chemistry , chromatography , composite material
Phase equilibrium in the TeO 2 Cu 2 O system was determined in air at atmospheric pressure. Differential thermal analysis (DTA), X‐ray powder diffraction and optical microscopy were used to identify the phase transitions. Two congruently melting compounds Te 3 Cu 2 O 7 and TeCu 2 O 3 were obtained. They possess monoclinic and hexagonal symmetry respectively. The morphology, optical properties and indexed powder pattern up to 1.3 Å are submitted for these compounds. Experiments realized by the DTA indicated the existence of an oxidation process with beginning and rate dependent on the composition. The glass formation limits determined for 2 g and 10 g tellurite glass melts correlate with the invariant points in the system.