Open AccessSYNTHESIS AND CRYSTALLIZATION OF A NEW COMPOUND K2Te4O9·3H2O IN THE TeO2-K3PO4-H2O SYSTEM UNDER HYDROTHERMAL CONDITIONS
Author(s) -
Jia Shouquan,
Jiang Pei-zhi,
Fan Xian-he,
Hongda Niu,
Li De-zhen
Publication year - 1983
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.32.791
Subject(s) - crystallization , hydrothermal circulation , phase (matter) , materials science , crystal (programming language) , hydrothermal synthesis , trigonal crystal system , diffraction , crystal growth , crystallography , analytical chemistry (journal) , crystal structure , chemical engineering , chemistry , thermodynamics , physics , optics , chromatography , organic chemistry , computer science , engineering , programming language
We investigated preliminarilly the synthesis and crystallization in the system TeO2-K3PO4-H2O under hydrothermal conditions. It was found that in addition to the crystals of TeO2, crystals of a new phase which we called γ could be obtained in the given range of constituent and growth conditions. The γ crystal belongs to trigonal system with α= b=10.734 ?, c=21.041?, α=β=90°, γ=120°. The formula of γ is K2Te4O9·3H2O. Furthermore,it was shown that the crystallized product in the crystallization zone depends mainly on the molar ratio of starting materials k=TeO2/K3PO4 in the system. When k≤1.90, the crystallized phase only consists of γ crystals, k≥2.22, only TeO2 crystals appears, while 1.902 are present together.Finally, the DTA curve and the relative intensities and corresponding d-values of X-ray powder diffraction pattern of γ-phase are also given.