NDLI: Effect of alumina concentration on thermal and structural properties of mas glass and glass-ceramics

Content Provider	Springer Nature Link
Author	Goswami, M. Sarkar, A. Sharma, B I. Shrikhande, V. K. Kothiyal, G. P.
Copyright Year	2004
Abstract	Magnesium aluminum silicate (MAS) glass samples with different concentrations of alumina (7.58 to 14.71 mol%) were prepared by melt and quench-technique. Total Mg content in the form of MgF$_{2}$+MgO was kept constant at 25 mol%. MAS glass was converted into glass-ceramics by controlled heat treatment at around 950°C. Crystalline phases present in different samples were identified by powder X-ray diffraction technique. Dilatometry technique was used to measure the thermal expansion coefficient and glass transition temperature. Scanning electron microscopy (SEM) was employed to study the microstructure of the glass-ceramic sample. It is seen from X-ray diffraction studies that at low Al$_{2}$O$_{3}$ concentrations (up to 10.5 mol%) both MgSiO$_{3}$ and fluorophlogopite phases are present and at higher Al$_{2}$O$_{3}$ concentrations of 12.3 and 14.7 mol%, fluorophlogopite and magnesium silicate (Mg$_{2}$SiO$_{4}$), respectively are found as major crystalline phases. The average thermal expansion co-efficient (α$_{avg}$) of the glass samples decreases systematically from 9.8 to 5.5·10$^{−6}$ °C$^{−1}$ and the glass transition temperature (T g) increases from 610.1 to 675°C with increase in alumina content. However, in glass-ceramic samples the α$_{avg}$ varies in somewhat complex manner from 6.8 to 7.9·10$^{−6}$ °C$^{−1}$ with variation of Al$_{2}$O$_{3}$ content. This was thought to be due to the presence of different crystalline phases, their relative concentration and microstructure.
Starting Page	699
Ending Page	705
Page Count	7
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	78
Issue Number	3
e-ISSN	15728943
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	glass-ceramics glass transition temperature magnesium aluminum silicate thermal expansion coefficient Inorganic Chemistry Physical Chemistry Polymer Sciences Measurement Science, Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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