Keerati Kirdsiri

Properties of CoO doped in Glasses Prepared from Rice Hush Fly Ash in Thailand

In this work, properties of glass from local rice husk ash (RHA) in Thailand have been investigated. RHA was sintered in different temperature. Compositions and phases of RHA were analyzed by energy dispersive x-ray fluorescence spectrometer (EDXRF) and X-ray diffractometer (XRD). The glasses were melt from RHA in formula 20 Na2O : 1.0 Al2O3 : 13 B2O3 : 6.3 CaO : 0.2 Sb2O3 : 4.5 BaO : 55SiO2 (using RHA as a SiO2 source) The density values of all RHA glasses are comparable and larger than glass from pure SiO2 under same glass formula and preparing condition. These results are corresponding with refractive index values. The RHA glasses showing colorless with absorption edge in ultraviolet region were obtained. The dark blue color glasses were melted from RHA with different CoO concentration. From this part, not found to be the relation of density and refractive index of glass with CoO concentration in glass matrix. From absorption spectra, the absorption peak were appeared around 600 nm, and peak intensity are increased, with increase CoO, correspond to 4A2(4F) → 4T1(4P) state of Co2+ in tetrahedral symmetry.

Photon Interaction in Borate Glass System Containing Bi2O3, PbO and BaO at 60 keV: Theoretical Calculation

Mass attenuation coefficients and partial photon interactions have been calculated theoretically at photon energy 60 keV for Bi2O3, PbO and BaO in xRmOn:(100-x)B2O3 glass system, when 30  x  70 (by %weight) using WinXCom. The values of these parameters have been found to significantly change with increasing of RmOn concentration. The variations of mass attenuation coefficients, photoelectric absorption, and coherent scattering were increased, whereas Compton scattering decreased along with increasing composition of glass samples. Those variations are due to photoelectric effect is the dominant interaction in low photon energy region. The use of mass attenuation coefficients to determine effective atomic numbers are also discuss, which found to be increase with the concentration of glass samples. This result reflecting the possibility to use bismuth and barium replaces lead for development of lead-free radiation protecting glass at appropriated photon energy, for leave non-toxically impact to our environment.

A Study of the Physical and Optical Properties of Ho3+ in Soda-Lime-Silicate Glass Systems

Soda-lime-silicate glasses in the compositions of (65-x)SiO2-25Na2O-10CaO-xHo2O3 (where x = 0.0, 0.50, 1.00, 1.50, 2.00 and 2.50 mol % ) were prepared by melt-quenching technique and characterized. The results show that, the absorption spectra of Ho3+ doped in soda-lime-silicate glass correspond with several bands, which are assigned from the ground state, 5I8 to 3H6 (360 nm), 5G4 (380 nm), 5G5 (417 nm), 5G6 (453 nm), 5F3 (479 nm), 5F4 (538 nm), 5F5 (639 nm), and 5I5 (880 nm). The refractive index and density of glasses were increase with increasing of Ho2O3 concentration. The color of glass samples is light amber with doped Ho2O3 in glass matrix.

Investigations of Physical and Optical Properties on Glass from Rice Husk Ash Doped with MnO2

In this research work, physical and optical properties on glass prepared from rice husk ash (RHA) doped with MnO2 glasses were in investigated. RHA was sintered at 1,000 °C and use as a silica source for glass production. The glass sample were prepared and doped with different concentrations of MnO2 ranging from 0.0 to 1.0 mol%. The results are shown that the colors of glass samples were altered from colorless to brown with increasing of MnO2 concentration. Refractive index and density were increased with increasing MnO2 concentration. The absorption peaks at 440 nm were obtained for all Mn doped glasses.

Effect of Addition TiO2 on Bi2O3-TiO2-B2O3 Glasses

Bismuth titanium borate glasses in compositions xTiO2 : (30-x)Bi2O3 : 70B2O3 (with x is in mol%, varying from 0% to 10%) were fabricated by the conventional melt quenching technique. The effect of TiO2 on the physical and spectroscopic properties of bismuth borate glasses have been carried out by means of density and UV-Visible spectroscopy measurement techniques. The density and molar volume of all glasses are found to change depend on TiO2 substitution. The fundamental absorption edges for all glasses have been identified using the theory proposed by Davis and Mott. The optical band gap (Eg) is found to decrease with increase in TiO2 content.

Optical and Physics Investigation of Fe2O3 Doped in Soda-Lime Silicate Glass at Different Melting Temperature

In this work, the effects of melting temperature (1200, 1300, 1400 and 1500 °C) on glass properties, prepared in the composition 64.4SiO2: 10.0CaO: 25.0Na2O: 0.6Fe2O3 have been investigated. The Fe2O3 doped glass shown green color due to the homogeneous distribution of Fe3+ and Fe2+ ions in the glass matrices. Refractive index, dielectric constant, optical dielectric constant and the reflection loss increases when the melting temperature is increased. The absorption bands are observed in the all spectra with the peaks around 380 and 435 nm are attributed to Fe3+ and board peak around 1,050 nm due to Fe2+. The Fe2+ peaks are increased with increasing of melting temperature, correspond with glass color.

A Novel Radiation Shielding Material for Gamma-Ray: The Development of Lutetium Lithium Borate Glasses

This work, gamma-ray shielding properties of the lutetium lithium borate glasses in the system Lu2O3 - Li2O - B2O3 have been evaluated as a shielding material at 662 keV photon energy. While the experimental mass attenuation coefficients (μm) have been determined by using the narrow beam transmission method, the theoretical data were calculated using WinXCom program. The good agreements between experimental and theoretical values have been obtained. Both experimental and computational mass attenuation coefficients data were used to obtain the effective atomic number (Zeff), and the effective electron density (Nel). Based on the obtained data, the Lu-based glasses have good shielding properties, the improved glasses could be used as gamma-rays shielding material.

NIR Luminescence and Spectroscopic Studies of Nd3+ Doped Lutetium Calcium Silico Borate Glasses

Lutetuim calcium silico borates (LuCaSiB) glasses doped with Nd3+ ions with molar composition of Lu2O3-CaO-SiO2-B2O3-Nd2O3 have been prepared by conventional melt quenching technique. Their properties have been evaluated throughout the density, refractive index, absorption and emission measurements. The density, molar volume and refractive index increase with increasing Nd2O3 concentration. The optical absorption spectra show twelve bands in visible and near infrared regions. The luminescence spectra exhibit three emission bands were observed at 900, 1072 and 1341 nm corresponding to 4F3/2 → 4I9/2, 4I11/2 and 4I13/2 transition respectively.

Influence of NiO on Physical and Optical Properties of Zinc Bismuth Borate Glasses

The objectives of this work are to prepare and to study some properties of zinc bismuth borate glasses containing NiO in chemical formula 10ZnO : 30Bi2O3 : (60-x)B2O3 : xNiO, with x is the concentration of NiO, ranges from 0.00 to 0.05 mol%. The results found that the density of glasses increase with increasing of NiO concentration, whereas the molar volumes decrease. Absorption spectra were performed using UV-VIS-NIR spectrophotometer in the region of ultraviolet to near infrared, the absorption peak was not found. Moreover, the color in CIE L*a*b* of all glass samples were also investigated.

Investigation some Properties of Bismuth Borate Glasses Containing Al2O3

The glass samples in bismuth borate glass matrix containing Al2O3, with the composition of xAl2O3 : 30Bi2O3 : (70-x)B2O3 where x are Al2O3 concentration varying from 0.0, 2.0, 4.0, 6.0, 8.0 and 10.0 mol%, have been prepared. The obtained glasses were investigated some physical and optical properties. The results showed that the densities increased with increasing of Al2O3 concentration, whereas the molar volumes decreased. For the absorption spectra, no peak in the UV to NIR regions has been observed. Moreover the energy band gap and the refractive index for all samples have been calculated.