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Properties of Na2O–Al2O3–B2O3 glasses by H. Doweidar; Y.M. Moustafa; S. Abd El-Maksoud; H. Silim is a Engineering article available to read on EtoBox.

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The density and transformation temperature of (30 -y)Na 2 O•yAl 2 O 3 •70B 2 O 3 glasses show a minimum at Al 2 O 3 /Na 2 O:1. The molar volume increases with increasing Al 2 O 3 concentration and it seems to be constant for Al 2 O 3 /Na 2 O] 1. There is a slight increase in the thermal expansion coefficient up to Al 2 O 3 /Na 2 O: 0.9 followed by a fast decrease. It is assumed that up to Al 2 O 3 /Na 2 O=1, Na 2 O associates preferentially with Al 2 O 3 to form AlO 4 tetrahedra. Infrared spectra are consistent with this assumption. There is a linear dependence between the electric resistivity and the activation energy. Both of these quantities increase with increasing Al 2 O 3 content. It is concluded that the conduction parameters are determined by the Na + -Na + distance.

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Author

H. Doweidar; Y.M. Moustafa; S. Abd El-Maksoud; H. Silim

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0921-5093)

Published

2001

Language

EN

Field

Engineering (Physical Sciences)