Papers by Keyword: Glasses

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Authors: Punsak Glumglomchit, Juniastel Rajagukguk, Jakrapong Kaewkhao, Keerati Kirdsiri
Abstract: 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.
246
Authors: Karl Michael Weitzel
Abstract: The recently developed bombardment induced ion transport (BIIT) technique is reviewed. BIIT is based on shining an energy-selected alkali ion beam at the surface of a sample of interest. Attachment of these ions leads to the build-up of a surface potential and a surface particle density. This in turn generates the corresponding gradients which induce ion transport towards a single metal electrode connected to the backside of the sample where it is detected as a neutralization current. Two different versions of BIIT are presented, i.) the native ion BIIT and ii.) the foreign ion BIIT. The former is demonstrated to provide access to absolute ionic conductivities and activation energies, the latter leads to the generation of electrodiffusion profiles. Theoretical modelling of these concentration profiles by means of the Nernst-Planck-Poisson theory allows to deduce the concentration dependence of diffusion coefficients.
107
Authors: Margit Fábián, Csaba Araczki
Abstract: Understanding of the incorporation of actinides in borosilicate matrix used for nuclear waste storage is of a great importance for radioactive waste immobilization. This study carried out on matrix glasses doped respectively with 30wt% UO3 and CeO2, Nd2O3 used for chemical modelling of the actinides. Neutron and X-ray diffraction measurements and Reverse Monte Carlo (RMC) simulations were performed. For several glasses, it was found that the basic network structure consists of tetrahedral SiO4 units and of mixed trigonal BO3 and tetrahedral BO4. The BO3 and BO4 units are linked to SiO4, forming mixed [4]Si-O-[3]B and [4]Si-O-[4]B bond-linkages. From significant second neighbour atomic pair correlations have been revealed that U, Ce, Nd accommodates in both silicate and borate site.
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Authors: P.K. Diwan, Hardev Singh Virk
Abstract: Range of heavy ion is one of the important parameters and understanding of this parameter is highly essential in almost all those experiments where heavy ions are used. The present review deals with the range measurements of different heavy ions through solid state nuclear track detectors (SSNTDs) technique. The importance of SSNTD technique as compared to other techniques is highlighted and different methods/models proposed for range measurements are described. An attempt has been made to compile the measured range values for heavy ions from H4 to U238 in different classes of SSNTD materials viz. polymers, glasses and minerals, from the available literature. An inter-comparison between the measured range values of different laboratories and through different range measurement methods has been made. Further, the reliability and validity of most commonly used theoretical and semi-empirical/empirical range formulations, through comparison with the measured range, are highlighted. Furthermore, the isotropic and anisotropic behaviour in polymers and minerals through range measurements has been described.Contents of Paper
174
Authors: Natthakridta Chanthima, Thanapong Sareein, Yaowaluk Tariwong, Jakrapong Kaewkhao, Narong Sangwaranatee
Abstract: Bismuth borophosphate glasses containing different doping cerium oxide have been synthesized at 1200 °C by melt-quenching technique. The doping concentration of the Ce3+ was varied from 0.05 mol% to 2.0 mol%. The glass samples were characterized through optical absorption and luminescence spectral measurements. UV-visible and near infrared absorption spectra of glass samples were not observed nevertheless the absorption edge was shift to the longer wavelength. The photoluminescence and radioluminescence spectra show emission bands around 367 nm under 317 nm excitation wavelength. Also, the highest emission intensity was found at 0.5 mol% CeF3 dopant for both of photoluminescence and radioluminescence.
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Authors: Suchart Kothan, Montree Tungjai, Sunisa Sarachai, Siriprapa Kaewjaeng, Suparat Tuscharoen, Pruittipol Limkitjaroenporn, Jakrapong Kaewkhao
Abstract: The mass attenuation coefficients and partial interactions of BaO-ZnO-B2O3 glasses have been investigated using WinXCom program at difference photon energy. BaO-ZnO-B2O3 glasses were prepared in composition xBaO: 20ZnO: (80-x)B2O3 (where x = 15 and 20 mol %) by melt quenching technique under normal atmosphere. The densities of glasses are 3.0052 and 3.1022 g/cm3, respectively. The mass attenuation coefficients at 20% mol are higher than 15% mol of BaO in all energy range. The optical spectra were measured and good transparent behavior was obtained. Half value layer (HVL) of glasses are also report and compared with same standard shielding materials and show better shielding than ordinary concrete.
438
Authors: Keerati Kirdsiri, Jakrapong Kaewkhao
Abstract: 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 4F3/24I9/2, 4I11/2 and 4I13/2 transition respectively.
137
Authors: Nuanthip Wantana, Onanong Chamlek, Natthakridta Chanthima, C.K. Jayasankar, Hong Joo Kim, Mitra Djamal, Jakrapong Kaewkhao
Abstract: Dysprosium doped lithium lanthanum borate glasses (LiLaB:Dy3+) were prepared by the melt quenching technique, varying the Dy2O3 doped concentration from 0.00 to 1.50 mol%. The absorption spectra showed that LiLaB:Dy3+ glass absorbed photon in visible light and near infrared region. From the excitation of 388 nm, this glass emitted the photon with 483, 575, 664 and 753 nm wavelength. The intensity of emission increased with increasing of Dy2O3 concentration until 1.0 mol%, after that it decreased. The Judd-Ofelt (J-O) analysis was applied to 1.0 mol% doped glass to investigate the J-O parameter, radiative transition possibility and stimulated emission cross section. These values were interpreted to the ability of laser gain medium.
389
Authors: Jesús Ma Rincón
Abstract: Since last decades both processes for the production of glass and ceramic materials (known by the generic name of "vitrification") and the processing of the usual ceramic materials ("sintering") are being investigated as a possible way to isolate, inmobilize and even recycling of industrial wastes as a source of "secondary raw materials". Starting from this point of view, the basis for the processing of some of wastes investigated by the author in the last decades are exposed, namely: metallurgy (muds or sludges...), residues from the production of energy (generation power plants, incinerators, nuclear power plants ...) wastes coming from the treatment of minerals and rocks (dumps, mine tailings, muds and machining of natural stone ...), as well as electrical wastes, demolition wastes and finally biomass residues which have been investigated in the recent years. This type of waste and mixtures give rise to synthetic materials with wide uses in construction and public works. Indeed, these are the only industries able to management of high volumes which may be suitable for absorbing a new range of glass, ceramic and glass-ceramic materials from all type of wastes. Experimental results obtained in last decades allow to conclude that both sintering processes as well as vitrification can be considered as an actual and useful, at least partially, for solving the environmental problems generated by all type of wastes.
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