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Fabrication of magnesium aluminum silicate glass ceramics by sintering route

Durrani S. K., Hussain M. A., Hussain S. Z., Hussain S. Z., Akhtar J., Saeed A., Hussain N., Ahmed N.

Materials Science Poland

2010

Vol. 28, No. 2

459--466

Magnesium aluminum silicate (MAS) glass ceramic material was prepared by the sintering route. A three-stage heat treatment, consisting of calcination, nucleation and crystallization, was developed with MgF2 as a nucleating agent. The effect of the percentage chemical composition and the sintering temperature on the density of the compacted material was also studied. The thermal stability of MAS was measured by thermogravimetry (TG), differential thermal analysis (DTA). TG/DTA studies revealed that the powder exists as MgO-Al2O3-SiO2-H2O in solid state, and then transforms to MgO-Al2O3-SiO2 via some metastable intermediates above 300 °C. The microstructure and phases were analyzed by X-ray diffractometry (XRD). XRD analysis revealed the formation of various phases such as magnesium silicate, fluorophlogopite, nobergite, siliminite etc. at various processing temperatures.

Noncommuting maps and invariant approximations

Hussain N., Latif A., Al-Mezel S.

Demonstratio Mathematica

2007

Vol. 40, nr 4

895-905

We obtain common fixed point results for generalized I-nonexpansive compatible as well as weakly compatible maps. As applications, various best approximation results for this class of maps are derived in the setup of certain metrizable topological vector spaces.

Common fixed point and invariant approximation results

Hussain N.

Demonstratio Mathematica

2006

Vol. 39, nr 2

389-400

We extend the concept of R-subweakly commuting maps due to Shahzad [21] to the case of non-starshaped domain and obtain common fixed point results for this class of maps on non-starshaped domain in the setup of p-normed spaces. As applications, we establish Brosowski-Meinardus type approximation theorems. Our results unify and extend the results of Al-Thagafi, Dotson, Habiniak, Jungck and Sessa, Sahab, Khan and Sessa, Singh and Shahzad.

Coincidence points for multivalued maps on non-starsharped domain

Hussain N.

Demonstratio Mathematica

2006

Vol. 39, nr 3

579-584

We improve recent results of Shahzad [Demonstratio Math. 36 (2003), 427-431].

Common fixed points and best approximation in p-normed spaces

Hussain N., Khan A. R.

Demonstratio Mathematica

2003

Vol. 36, nr 3

675--681

A general common fixed point result is obtained for commuting maps on non-starshaped domain in a p-normed space. As applications, we obtain Brosowski-Meinardus type approximation theorems in p-normed spaces which are not necessarily locally convex. Recent approximation results of a number of authors follow as a consequence of our results.