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Effect of TiO 2 Addition on the Optical, Thermo‐Physical, and Structural Aspects of Sodium Alumino‐Phosphate Glasses
Author(s) -
Tiwari Babita,
Sudarsan V.,
Dixit Anupum,
Kothiyal Govind P.
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.04292.x
Subject(s) - materials science , phosphate glass , glass transition , depolymerization , thermal expansion , ternary operation , analytical chemistry (journal) , phosphate , mineralogy , chemistry , composite material , polymer , organic chemistry , computer science , polymer chemistry , programming language
Transparent bubble free phosphate glasses having a composition 40Na 2 O–10Al 2 O 3 – x TiO 2 –(50− x )P 2 O 5 ( x =0–20 mol%) were prepared by melt quench method and characterized for their optical, thermo‐physical and structural aspects. Substitution of TiO 2 for P 2 O 5 up to 10 mol% in the ternary 40Na 2 O–10Al 2 O 3 –50P 2 O 5 glass increases the density, glass transition temperature ( T g ), microhardness (MH), and decreases the molar volume, thermal expansion coefficient, and optical gap ( E optical ). Further substitution of TiO 2 results in the decrease of density, T g , and MH. Based on the 31 P magic angle spinning nuclear magnetic resonance and Fourier transform infrared spectroscopy, it is established that up to 10 mol% TiO 2 incorporation in the glass, the network undergoes only a slow depolymerization while forming P–O–Al and P–O–Ti linkages. Variation in optical properties like E optical and wavelength corresponding to emission maxima indicates that up to 10 mol% incorporation, TiO 2 acts as a network modifier and above that it forms a network of Ti–O–Ti linkages connected with discrete PO 4 structural units. Thus, the variation in the thermo‐physical and optical properties has been explained by the composition‐dependent structural changes brought about by TiO 2 in the glass matrix.