In situ evolution of Ni environment in magnesium aluminosilicate glasses and glass–ceramics–Influence of ZrO2 and TiO2 nucleating agents

2015 ◽  
Vol 78 ◽  
pp. 137-146 ◽  
Author(s):  
A. Dugué ◽  
O. Dymshits ◽  
L. Cormier ◽  
B. Cochain ◽  
G. Lelong ◽  
...  
Keyword(s):  
Glass Ceramics ◽  
Nucleating Agents ◽  
Aluminosilicate Glasses

In Situ X-Ray Diffraction Studies of Crystallization Growth Behavior in ZnO-Bi2O3-B2O3 Glass as a Route to Functional Optical Devices

MRS Advances ◽  
2018 ◽  
Vol 3 (11) ◽  
pp. 563-567 ◽  
Author(s):  
Quentin Altemose ◽  
Katrina Raichle ◽  
Brittani Schnable ◽  
Casey Schwarz ◽  
Myungkoo Kang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Glass Ceramics ◽  
Treatment Temperature ◽  
Crystal Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
In Situ Xrd ◽  
Dsc Measurements ◽  
Transmission Window

ABSTRACTTransparent optical ZnO–Bi2O3–B2O3 (ZBB) glass-ceramics were created by the melt quenching technique. In this work, a melt of the glass containing stoichiometric ratios of Zn/Bi/B and As was studied. Differential scanning calorimeter (DSC) measurements was used to measure the thermal behavior. VIS/NIR transmission measurements were used to determine the transmission window. X-ray diffraction (XRD) was used to determine crystal phase. In this study, we explore new techniques and report a detailed study of in-situ XRD of the ZBB composition in order to correlate nucleation temperature, heat treatment temperature, and heat treatment duration with induced crystal phase.

Effects of Glass Elements on the Structural Evolution ofin situGrown Ferroelectric Perovskite Crystals in Sol-gel Derived Glass-ceramics

1997 ◽  
Vol 12 (4) ◽  
pp. 1131-1140 ◽  
Author(s):  
Kui Yao ◽  
Weiguang Zhu ◽  
Liangying Zhang ◽  
Xi Yao
Keyword(s):  
Crystallization Process ◽  
Sol Gel ◽  
Glass Ceramics ◽  
Structural Evolution ◽  
Dielectric Measurements ◽  
X Ray Diffraction ◽  
Process Change ◽  
X Ray ◽  
Ferroelectric Perovskite

Several ABO3perovskite ferroelectric crystals, PbTiO3, Pb(Zr, Ti)O3, and BaTiO3have beenin situgrown from amorphous gels with glass elements, and the structural evolution has been systematically investigated using x-ray diffraction (XRD), infrared spectra (IR), differential thermal analysis (DTA), thermogravimetric analysis (TGA), and dielectric measurements. It is found that in the Si-contained glass-ceramic systems, Si and B glass elements are incorporated into the crystalline structures, resulting in the variation of the crystallization process, change of lattice constant, and dielectric properties. Some metastable phases expressed by a general formula AxByGzOw(A = Pb and Ba; B = Zr and Ti; G for glass elements, especially for Si) have been observed and discussed.

A study on the preparation of CMAS glass–ceramics by in situ crystallization

2006 ◽  
Vol 431 (1-2) ◽  
pp. 191-195 ◽  
Author(s):  
Hanning Xiao ◽  
Yin Cheng ◽  
Liping Yu ◽  
Huabin Liu
Keyword(s):  
Glass Ceramics ◽  
In Situ Crystallization

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.

Nucleation and Growth of Nanocrystals in Glass-Ceramics: An In Situ SANS Perspective

2012 ◽  
Vol 95 (4) ◽  
pp. 1304-1312 ◽  
Author(s):  
Cristina Fernandez-Martin ◽  
Giovanni Bruno ◽  
Anne Crochet ◽  
Delavand Ovono Ovono ◽  
Monique Comte ◽  
...  
Keyword(s):  
Glass Ceramics ◽  
Nucleation And Growth

scholarly journals Characterisation and Properties of Lithium Disilicate Glass Ceramics in the SiO2-Li2O-K2O-Al2O3System for Dental Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Naruporn Monmaturapoj ◽  
Pornchanok Lawita ◽  
Witoon Thepsuwan
Keyword(s):  
Glass Composition ◽  
Glass Ceramics ◽  
Lithium Disilicate ◽  
Nucleating Agents ◽  
Fine Grained ◽  
Melting Glass ◽  
Heterogenous Nucleation ◽  
Dental Applications ◽  
Slight Amount ◽  
Glass Compositions

This work proposes four different glass formulas derived from the SiO2-Li2O-K2O-Al2O3system to investigate the effect of glass composition on their crystal formations and properties. Glass LD1 was SiO2-Li2O-K2O-Al2O3system with the addition of P2O5and CaF2as nucleating agents. In Glass LD2, a slight amount of MgO was mixed in order to increase the viscosity of the melting glass. Finally, the important factor of Si : Li ratio was increased in Glasses LD3 and LD4 with compositions otherwise the same as LD1 and LD2. The results found that P2O5and CaF2served as a nucleating site for lithium phosphate and fluorapatite to encourage heterogenous nucleation and produce a fine-grained interlocking microstructure of lithium disilicate glass ceramics. MgO content in this system seemed to increase the viscosity of the melting glass and thermal expansion coefficient including the chemical solubility. Increasing the Si : Li ratio in glass compositions resulted in the change of the microstructure of Li2Si2O5crystals.

Bioactive Apatite-Mullite Glass-Ceramic Coatings on Titanium Substrates

2006 ◽  
Vol 45 ◽  
pp. 1275-1280 ◽  
Author(s):  
Kenneth T. Stanton ◽  
Jean François Vanhumbeeck
Keyword(s):  
Glass Ceramic ◽  
Glassy State ◽  
Glass Ceramics ◽  
Ceramic Coatings ◽  
Ex Situ ◽  
Interfacial Region ◽  
Initial Application ◽  
Electron Microscopical ◽  
Titanium Substrates

Fluorapatite-mullite glass-ceramics have been shown to be bioactive in the cerammed state and the present study examines how they may be deposited on biomedical-grade titanium alloy substrates for orthopaedic applications. A simple deposition route was used for initial application of the material in the glassy state and it was then cerammed in-situ. This cheap and non-line-of-sight route produces well adherent coatings by virtue of a reaction between the coating and substrate during the ceramming step. Several characterization techniques including DSC and XRD have been used to determine the crystallization behaviour of the glass-ceramic ex-situ and electron microscopical techniques have been used to characterize glass-ceramic microstructures and the nature of the coating-substrate interfacial region.

Non-Isothermal Devitrification Study of Wollastonite-Tricalcium Phosphate Bioeutectic® Glass

2008 ◽  
Vol 396-398 ◽  
pp. 127-130 ◽  
Author(s):  
M. Magallanes-Perdomo ◽  
R. García Carrodeguas ◽  
P. Pena ◽  
P.N. De Aza ◽  
S. De Aza ◽  
...  
Keyword(s):  
Tricalcium Phosphate ◽  
Eutectic Composition ◽  
Rietveld Method ◽  
Glass Ceramics ◽  
Ambient Atmosphere ◽  
X Ray ◽  
Amorphous Content ◽  
Wide Range ◽  
Devitrification Process

This document describes and discusses the non-isothermal devitrification process of the wollastonite-tricalcium phosphate (W-TCP) eutectic glass. This eutectic glass has been studied in situ, from room temperature up to 1375 °C, by Neutron Diffractometry (ND) in vacuum. The data obtained were complemented and compared with those performed on ambient atmosphere by Differential Thermal Analysis (DTA) and with those of samples fired in air, at selected temperatures, and then cooled down and subsequently studied by laboratory X-ray Powder Diffraction (LXRD) and Field Emission Scanning Electron Microscopy (FE-SEM) fitted with Energy X-Ray Dispersive Spectroscopy (EDS). Selected samples have been investigated by quantitative full-phase analysis (including the amorphous content) using the Rietveld method. The experimental evidence indicates that the devitrification of W-TCP eutectic glass, begins at ~870°C, with the crystallization of a Ca-deficient apatite phase (Ca9.92(P5.85O23.54)(OH)2.03 (H2O)2.194) followed by wollastonite-2M (-CaSiO3) crystallization at 1006°C. At 1375°C the bio glassceramic is comprised of quasi-rounded colonies formed by a homogeneous mixture of pseudowollastonite (-CaSiO3) and -tricalcium phosphate (-Ca3(PO4)2). This microstructure corresponds to irregular eutectic structures and is similar to that of Bioeutectic® W-TCP material obtained previously, via controlled slow solidification of the eutectic composition, by some of the present authors. It has also been found that from the eutectic composition of the wollastonite – tricalcium phosphate binary system is possible to obtain a wide range of bio glass-ceramics through appropriate design of thermal treatments.

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