Studies of the effect of paramagnetic impurity in the structure of sodium disilicate glass
UNSPECIFIED. (2000) Studies of the effect of paramagnetic impurity in the structure of sodium disilicate glass. JOURNAL OF MATERIALS SCIENCE, 35 (11). pp. 2829-2832. ISSN 0022-2461Full text not available from this repository.
Magic angle spinning nuclear magnetic resonance (MAS NMR) is used to measure the Si-29 chemical shift and full width at half maximum in Na2O . 2SiO(2). xMnO for 0.0 less than or equal to x less than or equal to 0.8 glasses. The large space varying magnetic field of the paramagnetic centers increases the line width and moves the chemical shift to a lower frequency, i.e. more shielded, with the increase of Mn++. The T-1 relaxation time falls rapidly and the relaxation rate is shown to be proportional with the concentration of MnO. The differential thermal analysis (DTA) results show that the glass transition temperature, T-g, crystallization temperature, T-x, and liquidus temperature T-L do not change due to addition of MnO. This suggests that Mn++ does not form chemical bond with the network. However, the Mn++ acts as nucleating agent and enhances the crystallization and the rate of crystallization can be tailored by judicious choice of the amount of MnO. (C) 2000 Kluwer Academic Publishers.
|Item Type:||Journal Article|
|Subjects:||T Technology > TA Engineering (General). Civil engineering (General)|
|Journal or Publication Title:||JOURNAL OF MATERIALS SCIENCE|
|Publisher:||KLUWER ACADEMIC PUBL|
|Number of Pages:||4|
|Page Range:||pp. 2829-2832|
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