Buscar
Mostrando ítems 51-60 de 315
Glass formation and the structural study of the Sb2O3-SbPO4-WO3 system
(2017-01-01)
Glasses in the ternary system (Sb2O3)(0.6-x)(SbPO4)(0.4)(WO3)(x), with composition 0.1 ≤ x ≤ 0.5 (in mol %) were studied. The structural changes due to the replacement of Sb2O3 by WO3 have been investigated. It was found ...
Test of the Anderson Stuart model and correlation between free volume and the `universal conductivity in potassium silicate glasses
(2007)
Following recent finding it is shown that using conductivity and molar volume in binary potassium silicate glasses there is a common cubic scaling relation between them due to increase in alkali content. Emphasis is placed ...
Tailoring the refractive index of Ge-S based glass for 3D embedded waveguides operating in the mid-IR region
(2014)
The photosensitivity of GeSx binary glasses in response to irradiation to femtosecond pulses at 800 nm is investigated. Samples with three different molecular compositions were irradiated under different exposure conditions. ...
Structural investigations of tungsten silver phosphate glasses by solid state NMR, vibrational and X-ray absorption near edge spectroscopies
(Elsevier B.V., 2011-05-01)
Glasses were prepared in the pseudo-binary system (1 - x)AgPO(3)-xWO(3) (0 <= x <= 0.6 mol%). The structural evolution of the vitreous network was studied as a function of composition by thermal analysis, Fourier Transform ...
Structural investigations of tungsten silver phosphate glasses by solid state NMR, vibrational and X-ray absorption near edge spectroscopies
(Elsevier B.V., 2011-05-01)
Glasses were prepared in the pseudo-binary system (1 - x)AgPO(3)-xWO(3) (0 <= x <= 0.6 mol%). The structural evolution of the vitreous network was studied as a function of composition by thermal analysis, Fourier Transform ...
Crystallisation behaviour and glass-forming ability in Al-La-Ni system
(ELSEVIER SCIENCE SA, 2010)
The crystallisation behaviour for alloys in the Al-rich corner in the Al-La-Ni system is reported in this paper Alloys were selected based on the topological instability criterion (lambda criterion) calculated from the ...
Crystallization study of molybdate phosphate glasses by thermal analysis
(Elsevier B.V., 2009-11-01)
Vitreous samples were prepared in the binary system NaPO(3)-MoO(3) and their characteristic temperatures were determined by Differential Scanning Calorimetry. Glasses with high amounts of MoO(3) (>45 mol%) exhibit an intense ...
Structural study of thin films prepared from tungstate glass matrix by Raman and X-ray absorption spectroscopy
(Elsevier B.V., 2008-06-30)
Thin films were prepared using glass precursors obtained in the ternary system NaPO(3)-BaF(2)-WO(3) and the binary system NaPO(3)-WO(3) with high concentrations of WO(3) (above 40% molar). Vitreous samples have been used ...
Thermal, structural and optical properties of new tungsten lead-pyrophosphate glasses
(Elsevier B.V., 2011-10-01)
Crystalline lead-pyrophosphate precursor was prepared in aqueous solution from lead nitrate and phosphoric acid and characterized by X-ray diffraction, thermogravimetry and Raman scattering. This crystalline lead-phosphate ...
Stabilization of fluoroindate glasses by magnesium fluoride and other heavy metal fluorides
(Sociedade Brasileira de Química, 1998-06-01)
Their extended transparency in the IR makes them attractive for use as optical fibers for CO laser power delivery and optical amplification. This paper firstly describes the spectacular stabilizing effect of MgF2 on the ...