TITLE

Crystallization of TeO2--Nb2O5 glasses and their network structural evolution

AUTHOR(S)
LIN, J.; HUANG, W.; MA, L.; BIAN, Q.; QIN, S.; WEI, H.; CHEN, J.
PUB. DATE
June 2009
SOURCE
Materials Science (0137-1339);2009, Vol. 27 Issue 2, p329
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
TeO2-Nb2O5 glass is a kind of heavy metal oxide glass with a chain-like network structure, in which Nb5+ ions connect the Te-O chains and adjust the types of [TeOx] (x = 3, 4) coordination polyhedra to stabilize the glass network. (100 - y)TeO2-yNb2O5 (y = 3-20 mol %) glasses were prepared, the crystallization behaviour and their network structural evolution were studied by means of differential thermal analysis (DTA), X-ray diffraction (XRD) and Fourier transform infrared spectra (FT-IR). The results show that the stabilization of the TeO2-Nb2O5 glass network is greatly influenced by the constitution of Te-O chains and their linkage. The glass structure with lower Nb5+ content is inhomogeneous, it is composed of edge sharing Te-O chains, partly edge sharing chains connected by Nb5+ ions, apical sharing chains and apical sharing chains connected by Nb5+ ions. Crystalline phases of β-TeO2, Nb2Te4O13, α-TeO2 and Te3Nb2O11 will be formed in turn when the treatment temperature of the glass is increased. When the concentration of Nb 5+ ions is sufficient to well connect Te-O chains, the glass network will tend to homogenize, only one crystalline phase, Nb2Te4O13, will be formed. A suitable preheat treatment will also help to homogenize the glass structure and make the glass more stable.
ACCESSION #
44962438

 

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