Crystallization Behavior of a New Transparent Glass-Ceramics

2010 ◽  
Vol 105-106 ◽  
pp. 597-599 ◽  
Author(s):  
Shu Ming Wang ◽  
Feng Hua Kuang ◽  
Qing Zhi Yan ◽  
Qing Chun Zhang ◽  
Chang Chun Ge
Keyword(s):  
Glass Matrix ◽  
Crystallization Behavior ◽  
Glass Ceramics ◽  
Treatment Schedule ◽  
Transparent Glass ◽  
High Transparency ◽  
Optimum Heat ◽  
Heat Treatment Schedule ◽  
Simultaneous Variation ◽  
Optimum Heat Treatment

In this article we present a new kind of large grain transparent glass-ceramics obtained by the method of crystal growth from a homogenous glass, the simultaneous variation of the glass matrix and crystalline compositions during the crystallization results in the high transparency of this kind of large grain, high crystalline volume glass-ceramics, which have suitable refractive indexes between respective phases. The nucleation and crystallization behaviors of this kind of glass-ceramics have been investigated. The optimum heat treatment schedule for the glass was determined by means of DSC, XRD and SEM. The desirable optical property, such as laser characteristics etc, of this new kind of glass-ceramics can be further developed by doping with transition metals or rare-earths.

Nucleation and Crystallization of Glass-Ceramics from Coal Fly Ash

2007 ◽  
Vol 280-283 ◽  
pp. 1651-1654 ◽  
Author(s):  
Fei Peng ◽  
Kai Ming Liang ◽  
Hua Shao ◽  
An Min Hu ◽  
Feng Zhou
Keyword(s):  
Activation Energy ◽  
Fly Ash ◽  
Coal Fly Ash ◽  
Glass Ceramics ◽  
Treatment Schedule ◽  
Nucleation Agent ◽  
Optimum Heat ◽  
Heat Treatment Schedule ◽  
Kinetics Of ◽  
Optimum Heat Treatment

The nucleation and crystallization kinetics of glass obtained by melting coal fly ash with additives at 1550°C have been investigated. The optimum heat treatment schedule for the glass was nucleation at 825°C for 60min before crystallization at 962°C for 4h. The activation energy for crystallization of the glass-ceramics, obtained by the DDTA result, was 280.03 kJ/mol, lower than that of glass-ceramics obtained from pure reagents. The low activation energy is caused by impurities in fly ash, serving as nucleation agent. The results of XRD and SEM show that glass-ceramics developed nano-sized spherical wollastonite.

Preparation and Characterization of Sm3+ Doped CBS Transparent Glass-Ceramics

2011 ◽  
Vol 418-420 ◽  
pp. 796-799
Author(s):  
Yi Min Wang ◽  
Hong Bo Zhang ◽  
Chun Hui Su ◽  
Dong Dong Fan
Keyword(s):  
Room Temperature ◽  
Glass Ceramics ◽  
Treatment Schedule ◽  
Laser Material ◽  
Transparent Glass ◽  
Melting Method ◽  
Strong Luminescence ◽  
Heat Treatment Schedule ◽  
Precursor Glass

Sm3+ doped transparent glass-ceramics of CaO-B2O3-SiO2 (CBS) system were prepared and characterized.The precursor glass was prepared by melting method and annealed at 450°C for 2h and cooled to room temperature at a speed of 5°C/min.The appropriate heat treatment schedule to precursor glass was determined to be 2h at 600°C for nucleation and 3h at 810°C for crystallizition.The transmittion of glass-ceramics at the range of visable light is 68% in average. Five main emission bands of Sm3+ are centered around 564nm,605nm,646nm,679nm and 789nm,which correspond to the 4G 5/2→6H 5/2,4G 5/2→6H 7/2,4G 5/2→6H 9/2,4G 5/2→6H 11/2 and 4G 5/2→6H 13/2 transitions.Very strong luminescence at around 599nm is observed in glass-ceramics,This indicates glass-ceramics to be a better host for Sm3+ than precursor glass and a hopeful laser material.

Formation and Passive Q-Switch Performance of Glass-Ceramics Containing Co2+-Doped Spinel Nanocrystals

2008 ◽  
Vol 39-40 ◽  
pp. 219-224 ◽  
Author(s):  
Olga Dymshits ◽  
Alexander Shashkin ◽  
Alexander A. Zhilin ◽  
Yury Volk ◽  
Alexander Malyarevich ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Cross Sections ◽  
Near Infrared ◽  
Glass Ceramics ◽  
Excited State Absorption ◽  
Output Pulse ◽  
Treatment Schedule ◽  
Transparent Glass ◽  
Treatment Conditions ◽  
Heat Treatment Schedule

Compositions and heat treatment conditions were determined at which absorption and luminescence properties of aluminosilicate transparent glass-ceramics are defined mainly by tetrahedrally coordinated Co2+ ions located in spinel nanocrystals. Optical properties of cobaltdoped aluminosilicate transparent glass-ceramics have been studied in visible – near infrared (IR) spectral range. It was demonstrated that the concentration of tetrahedrally coordinated Co2+ ions in the spinel nanocrystals is determined by the CoO content in the initial glass and is independent of the heat-treatment schedule. Absorption saturation and bleaching relaxation under excitation of the 4A2→4T1(4F) transition of tetrahedrally coordinated Co2+ ions were studied. The value of groundstate and excited state absorption cross-sections of tetrahedrally coordinated Co2+ ions was estimated. Comparative study of output pulse parameters of Q-switched Er:glass laser using cobaltdoped glass-ceramics and Co2+:MgAl2O4 single crystal is presented.

scholarly journals Crystallization behavior of new transparent glass-ceramics based on barium borate glasses

2008 ◽  
Vol 116 (1353) ◽  
pp. 624-631 ◽  
Author(s):  
Fatma Hassan MARGHA ◽  
Salwa Abdel-Hameed Mohamed ABDEL-HAMEED ◽  
Nagwa Abd El-Shafy GHONIM ◽  
Shigeo SATOKAWA ◽  
Toshinori KOJIMA
Keyword(s):  
Crystallization Behavior ◽  
Glass Ceramics ◽  
Borate Glasses ◽  
Barium Borate ◽  
Transparent Glass

scholarly journals Study of PbTiO3-Based Glass Ceramics Containing SiO2

ISRN Ceramics ◽  
2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
V. K. Deshpande ◽  
V. U. Rahangdale
Keyword(s):  
Dielectric Constant ◽  
Glass Ceramic ◽  
Lead Titanate ◽  
Glass Ceramics ◽  
Treatment Schedule ◽  
Glass Ceramic Sample ◽  
Practical Applications ◽  
Ceramic Samples ◽  
Heat Treatment Schedule ◽  
Stage Heat Treatment

Glass samples with composition 50PbO : 25TiO2 : (25-X) B2O3 : XSiO2 (with X = 0, 1.5, 2.5, 3.5, and 5 mol%) were prepared by conventional quenching technique. These glass samples were converted to glass ceramics by the two-stage heat treatment schedule. Formation of ferroelectric lead titanate phase in the glass ceramics was confirmed from the XRD. The density, CTE, and dielectric constant of the glass and glass-ceramic samples were measured. The glass-ceramic sample containing 2.5 mol% SiO2 exhibited the highest dielectric constant. The SEMs of glass-ceramic samples were studied. The P-E hysteresis loop studies also revealed the highest remnant polarization for this sample, which has a potential for being developed for practical applications.

Phase Evolutionary Process of CaO-Al2O3-SiO2 System Glass and Glass-Ceramic

2010 ◽  
Vol 168-170 ◽  
pp. 1947-1952
Author(s):  
Feng He ◽  
Cai Ming Ping ◽  
Jin Shu Cheng
Keyword(s):  
Heat Treatment ◽  
Glass Ceramic ◽  
Bending Strength ◽  
Glass Ceramics ◽  
Evolutionary Process ◽  
Treatment Schedule ◽  
Nucleation Agent ◽  
Transmission Electron ◽  
New Type ◽  
Heat Treatment Schedule

Sintering glass-ceramics, a new type material for architectural decoration, belong to CaO-Al2O3-SiO2system (CAS) without nucleation agent. Combined by Differential thermal analysis (DTA), X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Transmission electron microscope (TEM), phase evolutionary process of CaO-Al2O3-SiO2system glass and glass-ceramic was investigated. According the relation between heat treatment schedule and microstructure, the glass system has a very wide temperature range of crystallization. The crystalline phase is β-CaSiO3(β-wollastonite) and there is no other crystalline phases precipitated in these glass-ceramics. The influences of various heat treatment systems on the structure and properties of the glass-ceramics were investigated simultaneously. The optimal heat treatment schedule, microstructure and bending strength of the CAS glass ceramic were gained.

Transparent glass-ceramics based on Co2+-doped γ-GaxAl2−xO3 spinel nanocrystals for passive Q-switching of Er lasers

2021 ◽  
Vol 234 ◽  
pp. 117993
Author(s):  
Olga Dymshits ◽  
Vladimir Vitkin ◽  
Irina Alekseeva ◽  
Alexander Khubetsov ◽  
Marina Tsenter ◽  
...  
Keyword(s):  
Glass Ceramics ◽  
Transparent Glass ◽  
Q Switching
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