Preparation of Lithium tetraborate nanocrystals by melt-quenching method and their characterization

2020 ◽  
Author(s):  
Neetu Rathore ◽  
Asita Kulshreshtha ◽  
R. K. Shukla
Keyword(s):  
Lithium Tetraborate ◽  
Melt Quenching ◽  
Quenching Method

scholarly journals Morphology and Magnetic Properties of Ferriferous Two-Phase Sodium Borosilicate Glasses

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Alexander Naberezhnov ◽  
Nadezda Porechnaya ◽  
Viktor Nizhankovskii ◽  
Alexey Filimonov ◽  
Bernard Nacke
Keyword(s):  
Magnetic Properties ◽  
Iron Oxides ◽  
Channel Structure ◽  
Borosilicate Glasses ◽  
Melt Quenching ◽  
Two Phase ◽  
Furnace Charge ◽  
Self Assembling ◽  
Quenching Method ◽  
Drop Structure

This contribution is devoted to the study of morphology and magnetic properties of sodium borosilicate glasses with different concentrations (15, 20, and 25 wt.%) ofα-Fe2O3in an initial furnace charge. These glasses were prepared by a melt-quenching method. For all glasses a coexistence of drop-like and two-phase interpenetrative structures is observed. The most part of a drop structure is formed by self-assembling iron oxides particles. All types of glasses demonstrate the magnetic properties and can be used for preparation of porous magnetic matrices with nanometer through dendrite channel structure.

scholarly journals Up- and Downconversion Luminescence Properties of Nd3+Ions Doped in Bi2O3–BaO–B2O3Glass System

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
R. Ruamnikhom ◽  
P. Limsuwan ◽  
M. Horprathum ◽  
N. Chanthima ◽  
H. J. Kim ◽  
...  
Keyword(s):  
Radiative Decay ◽  
Excited State Absorption ◽  
Upconversion Emission ◽  
Luminescence Properties ◽  
Barium Borate ◽  
Melt Quenching ◽  
Strong Fluorescence ◽  
Nir Emission ◽  
Quenching Method ◽  
Barium Borate Glass

Physical, optical, and luminescence properties of Nd3+ions in bismuth barium borate glass system were studied. The glasses prepared by a melt quenching method were doped at various Nd2O3concentrations in compositions (40-x)B2O3 : 40Bi2O3 : 20BaO : xNd2O3(wherex= 0.00, 0.50, 1.00, 1.50, 2.00, and 2.50 in mol%). Luminescence properties of the glasses were studied under two excitations of 585 and 750 nm for downconversion. From both excitations, the results show emission bands in NIR region corresponding to the transitions between4F3/2 → 4I9/2(900 nm),4F3/2 → 4I11/2(1,060 nm), and4F3/2 → 4I13/2(1,345 nm). The luminescence intensity obtained with 585 nm excitation was stronger than 750 nm, with the strongest NIR emission at 1,060 nm. The upconversion emission spectrum exhibits strong fluorescence bands in the UV region at 394 nm (λex=591 nm). The processes are associated with excited state absorption (ESA) from4F3/2level to4D3/2level and it is the radiative decay from the4D3/2to ground levels (4D3/2 → 4I13/2) which are responsible for the emission at 394 nm.

Structural Studies of Lead Sodium Borate Glasses

2010 ◽  
Vol 93-94 ◽  
pp. 439-442
Author(s):  
Pruittipol Limkitjaroenporn ◽  
Jakrapong Kaewkhao ◽  
Suparat Tuscharoen ◽  
Pichet Limsuwan ◽  
Weerapong Chewpraditkul
Keyword(s):  
Molar Volume ◽  
Glass Network ◽  
Sodium Borate ◽  
Borate Glasses ◽  
Structural Studies ◽  
Melt Quenching ◽  
Network Modifier ◽  
Ir Analysis ◽  
Quenching Method ◽  
Glass Compositions

Glass compositions xPbO : 20Na2O : (80-x)B2O3 (x = 5,10,15,20,25,30,35,40,45,50 and 55 %mol) have been prepared using melt-quenching method. The density and molar volume of these glass samples have been found to be compositional dependent. The results indicate that PbO acts on the glass structures were different between the range 0≤ x ≤ 20 %mol and beyond x = 20 %mol (with inflection at x = 20 %mol). These due to the PbO can enter the glass network both as a network modifier and also as a network former. This role depends on the type of bond between lead and oxide. These results are interpreted in term of IR analysis.

scholarly journals A Study of Fluoride-Containing Bioglass System for Dental Materials Derived from Clam Shell and Soda Lime Silica Glass

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Rohaniah Abdul Jalil ◽  
Khamirul Amin Matori ◽  
Mohd Hafiz Mohd Zaid ◽  
Norhazlin Zainuddin ◽  
Mohammad Zulhasif Ahmad Khiri ◽  
...  
Keyword(s):  
Silicon Dioxide ◽  
Dental Materials ◽  
Soda Lime ◽  
Medical Procedures ◽  
Chemical Bonds ◽  
Melt Quenching ◽  
Clam Shell ◽  
Alumino Silicate ◽  
Soda Lime Silica Glass ◽  
Quenching Method

The alumino-silicate-fluoride (ASF) bioglass system with empirical formula [(45-x)SiO2-xCaF2-20P2O5-20Al2O3-15CaO] where x = 5, 10, 15, and 20 (wt.%) has been synthesised by using conventional melt-quenching method. In this study, soda lime silica (SLS) glass and clam shell (CS) vitreous waste were utilized as a source of silicon dioxide (SiO2) and calcium oxide (CaO), respectively. The different physical behaviors of ASF bioglass were closely related to the CaF2 content in each composition. The structural analysis shows the presence of various chemical bonds showing the formation of ASF bioglass. The ASF bioglass has many applications in dental field and efforts to improve its formulation can promise a better future in medical procedures.

Effect of Mg Addition on Superconducting Properties of Ba-Y-Cu-O Ceramics Prepared by the Melt Quenching Method

1988 ◽  
Vol 27 (Part 2, No. 11) ◽  
pp. L2063-L2066 ◽  
Author(s):  
Takayuki Komatsu ◽  
Hideki Meguro ◽  
Ryuji Sato ◽  
Osamu Tanaka ◽  
Kazumasa Matusita ◽  
...  
Keyword(s):  
Superconducting Properties ◽  
Melt Quenching ◽  
Mg Addition ◽  
Quenching Method

Preparation of High-TcSuperconducting Bi-Ca-Sr-Cu-O Ceramics by the Melt Quenching Method

1988 ◽  
Vol 27 (Part 2, No. 4) ◽  
pp. L533-L535 ◽  
Author(s):  
Takayuki Komatsu ◽  
Kouji Imai ◽  
Ryuji Sato ◽  
Kazumasa Matusita ◽  
Tsutomu Yamashita
Keyword(s):  
Melt Quenching ◽  
Quenching Method

Plasma Enhanced Chemical Vapor Deposition of Silicon Sulfide and Phosphorus Sulfide thin Films

1994 ◽  
Vol 346 ◽  
Author(s):  
R.K. Shibao ◽  
V.I. Srdanov ◽  
M. Hay ◽  
H. Eckert
Keyword(s):  
Thin Films ◽  
Nuclear Magnetic Resonance ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Rate Ratio ◽  
Chemical Vapor ◽  
Flow Rate Ratio ◽  
Structural Studies ◽  
Melt Quenching ◽  
Quenching Method

ABSTRACTAmorphous SiSx:H (x ∼ 2) films have been synthesized from H2S and SiH4 precursors using a remote plasma enhanced chemical vapor deposition apparatus. Structural studies by solid state nuclear magnetic resonance (NMR) and Raman scattering reveal that the atomic environments in these materials are similar to those observed in melt-quenched silicon sulfide glasses, and are characterized by corner- and edge-shared SiS4/2 tetrahedra. Compared to these glasses, however, the films show consistently higher fractions of corner-sharing S1S4/2 tetrahedra. The ratio of corner- to edge sharing tetrahedra and the Si:S ratio can be influenced by the H2S/S1H4 flow rate ratio during deposition. Thus, PECVD opens up wider opportunities for structural tailoring of amorphous silicon sulfide materials than currently possible by means of the melt-quenching method. Preliminary data for the PECVD synthesis of phosphorus sulfide is also presented.

scholarly journals Europium-doped boro-bismuth-tellurite glasses for multicolor phosphor applications

2016 ◽  
Vol 94 (2) ◽  
pp. 188-191 ◽  
Author(s):  
K. Keshavamurthy ◽  
B. Eraiah
Keyword(s):  
Band Gap ◽  
Molar Volume ◽  
Urbach Energy ◽  
Glass System ◽  
Band Gaps ◽  
Tellurite Glasses ◽  
Melt Quenching ◽  
Yellow Orange ◽  
Quenching Method ◽  
Indirect Band Gap

The glass system (50–x)B2O3–30Bi2O3–20TeO2–xEu2O3 (x = 0, 0.1, 0.5, 1.0, 1.5, and 2.0 mol%) having been prepared using the conventional melt quenching method, is investigated in terms of physical, optical, and luminescence properties. The density of these glasses is measured and the corresponding molar volume is also calculated. The (αhν)1/n versus hν graph was plotted and it is well fitted to both direct (n = 1/2) and indirect (n = 2) band gaps. The direct and indirect band gap values range from 2.57 to 2.94 eV and 1.74 to 2.58 eV, respectively. The Urbach energy of the glass system was calculated to have values ranging from 0.29 to 0.62 eV. Yellow, orange, and red emissions have been observed through photoluminescence (PL) spectroscopy excited at 464 nm and the obtained multicolor emissions have been demonstrated according to the Commission International de l’Eclairage de France 1931 standards. The results of PL studies indicated the possibility towards the development of multicolor phosphor applications.

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