Investigation of the Role of Nucleating Agents in MgO−SiO2−Al2O3−SiO2−TiO2Glasses and Glass-Ceramics: A XANES Study at the Ti K- and L2,3-Edges

2011 ◽  
Vol 11 (1) ◽  
pp. 311-319 ◽  
Author(s):  
L. Cormier ◽  
O. Dargaud ◽  
N. Menguy ◽  
G. S. Henderson ◽  
M. Guignard ◽  
...  
Keyword(s):  
Glass Ceramics ◽  
Nucleating Agents

Magnetic Properties of xCeO2•(50 − x) PbO•50B2O3 Glasses and Glass Ceramics

2017 ◽  
Vol 13 (1) ◽  
pp. 4486-4494 ◽  
Author(s):  
G.El Damrawi ◽  
F. Gharghar
Keyword(s):  
Magnetic Properties ◽  
Large Scale ◽  
Glass Ceramics ◽  
Magnetic Behavior ◽  
Crystal Formation ◽  
Dual Roles ◽  
Effective Agent ◽  
Ordered Structures ◽  
Essential Change

Cerium oxide in borate glasses of composition xCeO2·(50 − x)PbO·50B2O3 plays an important role in changing both microstructure and magnetic behaviors of the system. The structural role of CeO2 as an effective agent for cluster and crystal formation in borate network is clearly evidenced by XRD technique. Both structure and size of well-formed cerium separated clusters have an effective influence on the structural properties. The cluster aggregations are documented to be found in different range ordered structures, intermediate and long range orders are the most structures in which cerium phases are involved. The nano-sized crystallized cerium species in lead borate phase are evidenced to have magnetic behavior.  The criteria of building new specific borate phase enriched with cerium as ferrimagnetism has been found to keep the magnetization in large scale even at extremely high temperature. Treating the glass thermally or exposing it to an effective dose of ionized radiation is evidenced to have an essential change in magnetic properties. Thermal heat treatment for some of investigated materials is observed to play dual roles in the glass matrix. It can not only enhance alignment processes of the magnetic moment but also increases the capacity of the crystallite species in the magnetic phases. On the other hand, reverse processes are remarked under the effect of irradiation. The magnetization was found to be lowered, since several types of the trap centers which are regarded as defective states can be produced by effect of ionized radiation. 

Assessment of role of iron ions on the physical and spectroscopic properties of multi-component Na2O−PbO−Bi2O3−SiO2 glass ceramics

2017 ◽  
Vol 91 (1) ◽  
pp. 92-107 ◽  
Author(s):  
M. V. Sambasiva Rao ◽  
A. Suneel Kumar ◽  
G. Chinna Ram ◽  
Ch. Tirupataiah ◽  
D. Krishna Rao
Keyword(s):  
Glass Ceramics ◽  
Spectroscopic Properties ◽  
Iron Ions ◽  
Sio2 Glass

Structural role of chromium sulfate in modified borate glasses and glass ceramics

Materialia ◽  
2021 ◽  
pp. 101095
Author(s):  
G. El-Damrawi ◽  
A.M. Abdelghany ◽  
M.I. Abdelghany ◽  
M.A. Madshal
Keyword(s):  
Glass Ceramics ◽  
Borate Glasses ◽  
Structural Role ◽  
Chromium Sulfate

Role of valence state of vanadium ions on structural and spectroscopic properties of sodium lead bismuth silicate glass ceramics

2018 ◽  
Author(s):  
M. V. Sambasiva Rao ◽  
Ch. Tirupataiah ◽  
A. Suneel Kumar ◽  
T. Narendrudu ◽  
S. Suresh ◽  
...  
Keyword(s):  
Silicate Glass ◽  
Valence State ◽  
Glass Ceramics ◽  
Spectroscopic Properties ◽  
Bismuth Silicate ◽  
Vanadium Ions

scholarly journals Development and Characterization of Glass-Ceramics from Combinations of Slag, Fly Ash, and Glass Cullet without Adding Nucleating Agents

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2032 ◽  
Author(s):  
Diana M. Ayala Valderrama ◽  
Jairo A. Gómez Cuaspud ◽  
Judith A. Roether ◽  
Aldo R. Boccaccini
Keyword(s):  
Thermal Analysis ◽  
Fly Ash ◽  
Structural Characteristics ◽  
Glass Ceramics ◽  
Industrial Applications ◽  
Industrial Wastes ◽  
Nucleating Agents ◽  
Glass Cullet ◽  
X Ray ◽  
Structural Applications

Developments in the field of materials science are contributing to providing solutions for the recycling of industrial residues to develop new materials. Such approaches generate new products and provide optimal alternatives to the final disposal of different types of industrial wastes. This research focused on identifying and characterizing slag, fly ash, and glass cullet from the Boyacá region in Colombia as raw materials for producing glass-ceramics, with the innovative aspect of the use of these three residues without the addition of nucleating agents to produce the glass-ceramics. To characterize the starting materials, X-ray diffraction (XRD), X-ray fluorescence (XRF), and Scanning Electron Microscopy (SEM) techniques were used. The results were used to evaluate the best conditions to produce mixtures of the three waste components and to determine the specific compositions of glass-ceramics to achieve products with attractive technical properties for potential industrial applications. The proposed mixtures were based on three compositions: Mixture 1, 2, and 3. The materials were obtained through thermal treatment at 1200 °C in a tubular furnace in accordance with the results of a comprehensive characterization using thermal analysis. The microstructure, thermal stability, and structural characteristics of the samples were examined through SEM, differential thermal analysis (DTA), and XRD analyses, which showed that the main crystalline phases were diopside and anorthite, with a small amount of enstatite and gehlenite. The obtained glass-ceramics showed properties of technical significance for structural applications.

Role of titanium ions on the physical and structural properties of calcium zinc bismuth phosphate glass ceramics

2016 ◽  
Vol 434 ◽  
pp. 62-70 ◽  
Author(s):  
A. Suneel Kumar ◽  
T. Narendrudu ◽  
S. Suresh ◽  
M.V. Sambasiva Rao ◽  
G. Chinna Ram ◽  
...  
Keyword(s):  
Structural Properties ◽  
Phosphate Glass ◽  
Glass Ceramics ◽  
Bismuth Phosphate

scholarly journals Role of MgF2 on properties of glass–ceramics

2012 ◽  
Vol 35 (5) ◽  
pp. 853-858 ◽  
Author(s):  
M GHASEMZADEH ◽  
A NEMATI
Keyword(s):  
Glass Ceramics
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