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Lee, Jae Sung
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  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Thermal stabilities, physical and optical properties of (KO)-O-2-(NaO)-O-2-(NbO5)-O-2-TeO2 glasses

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Title
Thermal stabilities, physical and optical properties of (KO)-O-2-(NaO)-O-2-(NbO5)-O-2-TeO2 glasses
Other Titles
Thermal stabilities, physical and optical properties of (KO)-O-2-(NaO)-O-2-(NbO5)-O-2-TeO2 glasses
Author
Jeong, Euh DuckHa, Myoung GyuPak, Hyuk KyuRyu, Bong KiBorse, Pramod H.Lee, Jae SungKomatsu, TakayukiKim, Hae JinKim, Hyun Gyu
Keywords
TeO2 glasses; refractive index; molar volume; thermal stability; activation energy
Issue Date
2006-11
Publisher
ELSEVIER SCIENCE INC
Citation
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, v.12, no.6, pp.926 - 931
Abstract
The thermal stabilities, physical and optical properties of xK(2)O-(14-x)Na2O-14Nb(2)O(5)-72TeO(2) (x = 0 similar to 12 mol%) glasses have been studied. The glasses consisting of ca. 10 mol% K2O show high thermal stabilities with values of Delta T = Tx - Tg = ca. 105 degrees C against crystallization, where Tg and Tx are the glass transition and crystallization onset temperatures, respectively. The activation energy of grain growth of a cubic crystalline phase in the 10K(2)O-4Na(2)O-14Nb(2)O(5)-72TeO(2) glass was 7.92 kJ/mol. The energy required for the phase transformation from the 10K(2)O-4Na(2)O-14Nb(2)O(5)-72TeO(2) glass to the cubic crystalline phase was 190.74 kJ/mol. The optical and physical properties of the K2O-Na2O-Nb2O5-TeO2 glasses were obtained: refractive index, n = 1.88-1.97; rho = 4.22-4.64 g/cm(3); optical energy band of the transmission cut-off wavelength, Eg (eV) = 3.17-3.14; relative permittivity, epsilon(r,) = 28-29. The values of R-M and alpha(m) for K2O-Na2O-Nb2O5-TeO2 glasses were much larger than those of Na2O-Nb2O5-TeO2 glasses
URI
https://scholarworks.unist.ac.kr/handle/201301/13143
ISSN
1226-086X
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ECHE_Journal Papers
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