Abstract
The xSrTiO 3 -(1−x)NaPO 3 (x = 0−0.20 mol%) glasses were prepared by the conventional melt-quenching method. The amorphous state of the samples was verified by X-ray diffraction. The glass-ceramic materials were obtained by the well known thermal controlled crystallization process. It is found that several physical properties such as the density, molar volume, and the glass transition temperature depend strongly on the chemical composition. Vickers test on the glasses showed that the micro-hardness increases with the SrTiO 3 content. The structural approach of the glasses was realized by IR spectroscopy. This technique has highlighted the co-existence of different phosphate and titanium structural units in the glassy-matrix. Crystallization of the glasses was enhanced by heat treatments and followed by X-ray diffraction. A mechanism for this glass crystallization was proposed.
Highlights
Phosphate glasses are used in various applications such as bone transplantation, glass to metal seals, confining radioactive wastes, fast ion conductors, laser host materials, etc. . . [1].Strontium titanate SrTiO3 is considered a promising material for tunable microwave applications due to its high dielectric constant, high dependence of dielectric constant on the applied field, and low losses [2].In the present work, our interest is focused on studying phosphate glasses inside the NaPO3-SrTiO3 system for the first time
Crystallization of the glasses was enhanced by heat treatments and followed by X-ray diffraction
The width of the glassy region inside the system NaPO3SrTiO3 was checked by X-ray diffraction analysis and the transparency of the samples
Summary
Phosphate glasses are used in various applications such as bone transplantation, glass to metal seals, confining radioactive wastes, fast ion conductors, laser host materials, etc. . . [1]. Phosphate glasses are used in various applications such as bone transplantation, glass to metal seals, confining radioactive wastes, fast ion conductors, laser host materials, etc. Strontium titanate SrTiO3 is considered a promising material for tunable microwave applications due to its high dielectric constant, high dependence of dielectric constant on the applied field, and low losses [2]. Our interest is focused on studying phosphate glasses inside the NaPO3-SrTiO3 system for the first time. The experimental requirements for the synthesis were determined and the characterization by density measurements, thermal analysis, Vickers test and infrared spectroscopy were realized
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