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Structural and Textural Modifications of Ternary Phosphate Glasses by Thermal Treatment
Author(s) -
Samickannian Aravindan,
Venkatachalam Rajendran,
Nallaiyan Rajendran,
Abubakkar Nishara Begum
Publication year - 2011
Publication title -
international journal of applied glass science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 34
eISSN - 2041-1294
pISSN - 2041-1286
DOI - 10.1111/j.2041-1294.2011.00053.x
Subject(s) - materials science , crystallization , amorphous solid , glass transition , thermal treatment , thermal stability , porous glass , mineralogy , scanning electron microscope , differential thermal analysis , ternary operation , analytical chemistry (journal) , ceramic , glass ceramic , thermal analysis , composite material , chemical engineering , thermal , porosity , crystallography , diffraction , thermodynamics , chemistry , optics , programming language , physics , chromatography , computer science , engineering , polymer
Phosphate‐based glasses of composition x Na 2 O −(45+(10− x )) CaO −45 P 2 O 5 with different Na 2 O , CaO ( x = 1, 5, 10, 15, and 20 mol%), and invariable P 2 O 5 (45 mol%) contents were prepared using the rapid melt quench technique. The obtained thermal data from differential thermal analysis revealed a decline in glass transition ( T g ) and crystallization ( T c ) temperatures of glasses against the compositional changes. The inclusion of Na 2 O at the cost of CaO in the glass network led to a reduction in its thermal stability. The thermal treatment carried out on glasses helped to derive their glass‐ceramic counterparts. The amorphous and crystalline features of samples were characterized using X ‐ray diffraction patterns. The crystalline species that emerged out of the calcium phosphate phases confirmed the dominance of Q 1 and Q 2 structural distributions in the investigated glass‐ceramics. The obtained scanning electron micrographs and atomic force microscopic images confirmed the surface crystallization and textural modification of the samples after thermal treatment. The N 2 ‐adsorption–desorption studies explored the reduction of porous structures due to thermal treatment on the melt‐driven glass surface. The measured elastic moduli and V icker's hardness values of the glasses showed an increase after thermal treatment, which were reduced against the inclusion of alkali content in both glass and glass‐ceramics.