scholarly journals Ta2O5 Nanocrystals Strengthened Mechanical, Magnetic, and Radiation Shielding Properties of Heavy Metal Oxide Glass

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4494
Author(s):  
Xinhai Zhang ◽  
Qiuling Chen ◽  
Shouhua Zhang
Keyword(s):  
Heavy Metal ◽  
Metal Oxide ◽  
Network Connectivity ◽  
Radiation Shielding ◽  
Oxide Glass ◽  
Oxide Glasses ◽  
X Ray Diffraction ◽  
Network Modifier ◽  
Doped Glasses ◽  
Doped Glass

In this study, for the first time, diamagnetic 5d0 Ta5+ ions and Ta2O5 nanocrystals were utilized to enhance the structural, mechanical, magnetic, and radiation shielding of heavy metal oxide glasses. Transparent Ta2O5 nanocrystal-doped heavy metal oxide glasses were obtained, and the embedded Ta2O5 nanocrystals had sizes ranging from 20 to 30 nm. The structural analysis of the Ta2O5 nanocrystal displays the transformation from hexagonal to orthorhombic Ta2O5. Structures of doped glasses were studied through X-ray diffraction and infrared and Raman spectra, which reveal that Ta2O5 exists in highly doped glass as TaO6 octahedral units, acting as a network modifier. Ta5+ ions strengthened the network connectivity of 1–5% Ta2O5-doped glasses, but Ta5+ acted as a network modifier in a 10% doped sample and changed the frame coordination units of the glass. All Ta2O5-doped glasses exhibited improved Vicker’s hardness, magnetization (9.53 × 10−6 emu/mol), and radiation shielding behaviors (RPE% = 96–98.8%, MAC = 32.012 cm2/g, MFP = 5.02 cm, HVL = 0.0035–3.322 cm, and Zeff = 30.5) due to the increase in density and polarizability of the Ta2O5 nanocrystals.

scholarly journals Up-conversion luminescence in low phonon heavy metal oxide glass co-doped with Er3+/Ho3+

2018 ◽  
Vol 10 (1) ◽  
pp. 2 ◽  
Author(s):  
T. Ragiń ◽  
A. Baranowska ◽  
M. Sołtys ◽  
A. Górny ◽  
J. Zmojda ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Energy Transfer ◽  
Metal Oxide ◽  
Upconversion Luminescence ◽  
Bismuth Germanate ◽  
Oxide Glass ◽  
Oxide Glasses ◽  
Mid Infrared ◽  
Co Doped ◽  
Germanate Glasses

In this paper, heavy metal oxide glasses co-doped with erbium and holmium ions have been synthesized. Glass composition, based on the bismuth and germanium oxides, has been selected in terms of high thermal stability (delta T = 125 °C), high refractive index (n = 2.19) and low maximum phonon energy (hvmax = 724 cm-1). Up-conversion luminescence spectra under the 980 nm laser diode excitation have been observed as a result of radiative transitions within the quantum energy level structures of Er3+ and Ho3+ ions. Optimization of rare earth ions content has been conducted, the highest emission intensity in the visible wavelength range has been observed in glass co-doped with molar concentration 0.5 Er2O3 / 0.5 Ho2O3. Full Text: PDF ReferencesF. Zhang, Z. Bi, A. Huang, Z. Xiao, "Visible luminescence properties of Er3+?Pr3+ codoped fluorotellurite glasses", Opt. Materials 41, 112 (2014). CrossRef S. Li, S. Ye, T. Liu, H. Wang, D. Wang, "Enhanced up-conversion emissions in ZnO-LiYbO2:RE3+ (RE = Er or Ho) hybrid phosphors through surface modification", J. All. Comp. 658, 85 (2016). CrossRef J. Fu, X. Zhang, Z. Chao, Z. Li, J. Liao, D. Hou, H. Wen, X. Lu, X. Xie, "Enhanced upconversion luminescence of NaYF4:Yb, Er microprisms via La3+ doping", Opt. Laser Tech. 88, 280 (2017). CrossRef Y. Tian, R. Xu, L. Hu, J. Zhang, "2.7 ?m fluorescence radiative dynamics and energy transfer between Er3+ and Tm3+ ions in fluoride glass under 800 nm and 980 nm excitation", J. Quant. Spec. Rad. Tra. 113, 87 (2012). CrossRef M. Zhang, A. Yang, Y. Peng, B. Zhang, H. Ren, W. Guo, Y. Yang, C. Zhai, Y. Wang, Z. Yang, D. Tang, "Dy3+-doped Ga?Sb?S chalcogenide glasses for mid-infrared lasers", Mat. Res. Bul. 70, 55 (2015). CrossRef G. Yang, T. Li, "Broadband 1.53 ?m emission in Er3+-doped Ga-Bi-Pb-Ge heavy metal oxide glasses", J. Rare Earths 26, 924 (2008). CrossRef Y. Guo, Y. Tian, L. Zhang, L. Hu, J. Zhang, "Erbium doped heavy metal oxide glasses for mid-infrared laser materials", J. Non-Cryst. Solids 377, 119 (2013). CrossRef Z. Hou, Z. Xue, F. Li, M. Wang, X. Hu, S. Wang, "Luminescence and up-conversion mechanism of Er3+/Ho3+ co-doped oxyfluoride tellurite glasses and glass?ceramics", J. All. Comp. 577, 523 (2013). CrossRef X. Li, Q. Nie, S. Dai, T. Xu, L. Lu, X. Zhang, "Energy transfer and frequency upconversion in Ho3+/Yb3+ co-doped bismuth-germanate glasses", J. All. Comp. 454, 510 (2008). CrossRef S.S. Rojas, J.E. De Souza, M.R.B. Andreeta, A.C. Hernandes, "Influence of ceria addition on thermal properties and local structure of bismuth germanate glasses", J. Non-Cryst. Solids 356, 2942 (2010). CrossRef M.S. Ebrahim, Irina, Mid-infrared coherent sources and applications, Springer (2008). CrossRef T. Ragin, J. Zmojda, M. Kochanowicz, P. Miluski, P. Jelen, M. Sitarz, D. Dorosz, "Enhanced mid-infrared 2.7 ?m luminescence in low hydroxide bismuth-germanate glass and optical fiber co-doped with Er3 +/Yb3 + ions", J. Non-Cryst. Solids 457, 169 (2017). CrossRef K. Biswas, A.D. Sontakke, R. Sen, K. Annapurna, "Enhanced 2 ?m broad-band emission and NIR to visible frequency up-conversion from Ho3+/Yb3+ co-doped Bi2O3?GeO2?ZnO glasses", Spectr. Acta. Part A, Mol. Biomol. Spectr. 112, 301-308 (2013). CrossRef R.S. Romaniuk, D. Dorosz, J. Żmojda, M. Kochanowicz, W. Mazerski, "Upconversion luminescence in tellurite glass codoped with Yb3+/Ho3+ ions", Proc. of SPIE 8903, 890307 (2013). CrossRef

Structural Changes in Two Different Types of Oxide Glass Melts: Borates and Metaphosphates

1998 ◽  
Vol 53 (10-11) ◽  
pp. 874-882 ◽  
Author(s):  
G. Herms ◽  
J. Sakowski ◽  
W. Gerike ◽  
Dörte Stachel
Keyword(s):  
Structural Changes ◽  
Oxide Glass ◽  
Oxide Glasses ◽  
X Ray Diffraction ◽  
Glass Melts ◽  
Network Modifier ◽  
Different Types ◽  
The One ◽  
Molten Oxide ◽  
Solid Glass

Abstract X-ray diffraction experiments of molten oxide glasses, which give new insights into the structure of melts, were carried out. Using modern means (synchrotron radiation, image plates, container-less high-temperature technique) it could be shown that the short range order of melt and solid glass is often qualitatively different. If vitreous B2O3 or binary borate glasses with low content of network modifier are heated up above Tg , the network topology begins to alter. With rising temperature more and more of the boroxol groups are replaced by independent B0 3 groups. While melting a metaphosphate glass, how-ever, structural changes of another kind take place. In solid glass the environment of the network modifier ions is similar to the one found in crystalline modifications, and their distances to the surrounding PO4 tetrahedra have narrow distributions. In the melt, however, these distances scarcely become evident, probably owing to the increased thermal motion of the modifier ions.

scholarly journals Development of Dispersion-Optimized Photonic Crystal Fibers Based on Heavy Metal Oxide Glasses for Broadband Infrared Supercontinuum Generation with Fiber Lasers

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4127 ◽  
Author(s):  
Grzegorz Stępniewski ◽  
Jacek Pniewski ◽  
Dariusz Pysz ◽  
Jarosław Cimek ◽  
Ryszard Stępień ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Photonic Crystal ◽  
Metal Oxide ◽  
Near Infrared ◽  
Average Power ◽  
Supercontinuum Generation ◽  
Oxide Glass ◽  
Geometrical Parameters ◽  
Oxide Glasses ◽  
Crystal Fibers

In this work a photonic crystal fiber made of a heavy metal oxide glass with optimized dispersion profile is proposed for supercontinuum generation in a broad range of wavelengths in the near-infrared, when pumped by a mode-locked fiber-based laser. The fiber is modelled and optimal geometrical parameters are selected to achieve flat and low dispersion in the anomalous regime. Supercontinuum generation in the range of 0.76–2.40 µm, within the dynamics of 30 dB, when pumped at 1.56 µm with 400 fs–long pulses and an average power 660 mW is possible. The applicability of such fibers is also discussed.

scholarly journals A Closer Look on Nuclear Radiation Shielding Properties of Eu3+ Doped Heavy Metal Oxide Glasses: Impact of Al2O3/PbO Substitution

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5334
Author(s):  
Ghada ALMisned ◽  
Huseyin O. Tekin ◽  
Antoaneta Ene ◽  
Shams A. M. Issa ◽  
Gokhan Kilic ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Oxide ◽  
Maximum Level ◽  
Radiation Shielding ◽  
Nuclear Radiation ◽  
Fast Neutrons ◽  
Nominal Composition ◽  
Oxide Glasses ◽  
Wide Range ◽  
Shielding Properties

In this study, a group of heavy metal oxide glasses with a nominal composition of 55B2O3 + 19.5TeO2 + 10K2O + (15−x) PbO + xAl2O3 + 0.5Eu2O3 (where x = 0, 2.5, 5, 7.5, 10, 12.5, and 15 in wt.%) were investigated in terms of their nuclear radiation shielding properties. These glasses containing lanthanide-doped heavy metal oxide were envisioned to yield valuable results in respect to radiation shielding, and thus a detailed investigation was carried out; the obtained results were compared with traditional and new generation shields. Advanced simulation and theoretical methods have been utilized in a wide range of energy regions. Our results showed that the AL0.0 sample with the highest PbO contribution had superior shielding properties in the entire energy range. The effective removal of cross-sections for fast neutrons (ΣR) was also examined. The results indicated that AL5.0 had the greatest value. While increasing the concentration of Al2O3 in samples had a negative effect on the radiation shielding characteristics, it can be concluded that using PbO in the Eu3+ doped heavy metal oxide glasses could be a useful tool to keep gamma-ray shielding properties at a maximum level.

Evaluation of Spectroscopic Properties of Yb 3+ in Silicate-Based Heavy Metal Oxide Glasses

2003 ◽  
Vol 20 (3) ◽  
pp. 408-410 ◽  
Author(s):  
Dai Neng-Li ◽  
Hu Li-Li ◽  
Dai Shi-Xun ◽  
Yang Jian-Hu ◽  
Lin Ao-Xiang
Keyword(s):  
Heavy Metal ◽  
Metal Oxide ◽  
Spectroscopic Properties ◽  
Oxide Glasses

scholarly journals Gamma, Fast Neutron, Proton, and Alpha Shielding Properties of Borate Glasses: A Closer Look on Lead (II) Oxide and Bismuth (III) Oxide Reinforcement

2021 ◽  
Vol 11 (15) ◽  
pp. 6837
Author(s):  
Ghada ALMisned ◽  
Huseyin O. Tekin ◽  
Esra Kavaz ◽  
Ghaida Bilal ◽  
Shams A.M. Issa ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Oxide ◽  
Gamma Radiation ◽  
Fast Neutron ◽  
Effective Atomic Number ◽  
Mean Free Path ◽  
Oxide Glass ◽  
Borate Glasses ◽  
Radiation Attenuation ◽  
Shielding Properties

The purpose of this research was to investigate the shielding characteristics of high-amount heavy metal oxide and Eu3+-activated borate glasses based on 10La2O3–50HMO–(40–x) B2O3–xEu2O3 (x = 0, 0.5, 1, 2, and HMO = PbO, Bi2O3). Critical gamma radiation attenuation characteristics, particularly mass attenuation coefficients of investigated heavy metal oxide glass samples, were determined using Monte Carlo simulations and the Phy-x/PSD software. Following that, we looked at the half-value layer, mean free path, effective atomic number, and build-up factors across a broad energy range (0.015–15 MeV). According to the study’s results, the addition of Eu2O3 enhanced the mass attenuation coefficient and effective atomic number, while reducing the half-value layer, mean free path, and accumulation factors. In terms of gamma radiation attenuation, the LBi50BEu glass system surpassed the LPb50BEu glass system in terms of overall shielding properties against nuclear radiation. Additionally, the heavy metal oxide glass’ efficacy as a neutron shield was determined using fast neutron removal cross-sections (ΣR). LBi50BEu2 glass was shown to be more effective in preventing the penetration of charged particle radiation.

scholarly journals Quench-free enhanced emission in cluster-free Er-doped heavy metal oxide glasses

2019 ◽  
Vol 9 (3) ◽  
pp. 1072 ◽  
Author(s):  
Kristina Lipinska ◽  
Francesca Cavallo ◽  
A. Jean-Luc Ayitou ◽  
Carlo U. Segre
Keyword(s):  
Heavy Metal ◽  
Metal Oxide ◽  
Oxide Glasses ◽  
Er Doped

Crystallization kinetics of new heavy metal oxide glasses within the Sb2O3-Na2O-WO3-PbO system

2017 ◽  
Vol 43 (1) ◽  
pp. 491-497 ◽  
Author(s):  
M. Çelikbilek Ersundu ◽  
A.E. Ersundu ◽  
M.T. Soltani ◽  
M. Baazouzi
Keyword(s):  
Heavy Metal ◽  
Metal Oxide ◽  
Crystallization Kinetics ◽  
Oxide Glasses ◽  
Kinetics Of

Influence of the melting conditions of heavy metal oxide glasses containing bismuth oxide on their optical absorption

2006 ◽  
Vol 352 (8) ◽  
pp. 761-768 ◽  
Author(s):  
O. Sanz ◽  
E. Haro-Poniatowski ◽  
J. Gonzalo ◽  
J.M. Fernández Navarro
Keyword(s):  
Heavy Metal ◽  
Optical Absorption ◽  
Metal Oxide ◽  
Bismuth Oxide ◽  
Oxide Glasses ◽  
Melting Conditions
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