Structural evolution of Ni environment in lithium, magnesium and zinc aluminosilicate glasses and glass-ceramics

2015 ◽  
Vol 413 ◽  
pp. 24-33 ◽  
Author(s):  
A. Dugué ◽  
O. Dymshits ◽  
L. Cormier ◽  
B. Cochain ◽  
G. Lelong ◽  
...  
Keyword(s):  
Glass Ceramics ◽  
Structural Evolution ◽  
Aluminosilicate Glasses

Structural evolution of luminescence nanoparticles with rare-earth ions in the oxyfluoride glass ceramics

2019 ◽  
Vol 237 ◽  
pp. 121830 ◽  
Author(s):  
S.E. Kichanov ◽  
Yu.E. Gorshkova ◽  
G.E. Rachkovskaya ◽  
D.P. Kozlenko ◽  
G.B. Zakharevich ◽  
...  
Keyword(s):  
Rare Earth ◽  
Glass Ceramics ◽  
Structural Evolution ◽  
Rare Earth Ions ◽  
Oxyfluoride Glass

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.

scholarly journals Investigation on Structural and Optical Properties of Willemite Doped Mn2+Based Glass-Ceramics Prepared by Conventional Solid-State Method

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Nur Farhana Samsudin ◽  
Khamirul Amin Matori ◽  
Josephine Ying Chi Liew ◽  
Yap Wing Fen ◽  
Mohd Hafiz Mohd Zaid ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
Glass Ceramics ◽  
Structural Evolution ◽  
Emission Spectra ◽  
Soda Lime ◽  
X Ray Diffraction ◽  
Glass Waste ◽  
Solid State Method ◽  
Ceramic Samples ◽  
Zno Crystal

Mn-doped willemite (Zn2SiO4:Mn2+) glass-ceramics derived from ZnO-SLS glass system were prepared by a conventional melt-quenching technique followed by a controlled crystallization step employing the heat treatment process. Soda lime silica (SLS) glass waste, ZnO, and MnO were used as sources of silicon, zinc, and manganese, respectively. The obtained glass-ceramic samples were characterized using the X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Fourier Transform Infrared (FTIR), UV-Visible (UV-Vis), and photoluminescence (PL) spectroscopy. The results of XRD revealed that ZnO crystal and willemite (β-Zn2SiO4) were presented as major embedded crystalline phases. This observation was consistent with the result of FESEM which showed the presence of irregularity in shape and size of willemite crystallites. FTIR spectroscopy exhibits the structural evolution of willemite based glass-ceramics. The optical band gap shows a decreasing trend as the Mn-doping content increased. Photoluminescent technique was applied to characterize the role of Mn2+ions when entering the willemite glass-ceramic structure. By measuring the excitation and emission spectra, the main emission peak of the glass-ceramic samples located at a wavelength of 585 nm after subjecting to 260 nm excitations. The following results indicate that the obtained glass-ceramics can be applied as phosphor materials.

Chemical Route to Aluminosilicate Gels, Glasses and Ceramics

1986 ◽  
Vol 73 ◽  
Author(s):  
J. C. Pouxviel ◽  
J. P. Boilot ◽  
A. Dauger ◽  
L. Huber
Keyword(s):  
Thermal Treatment ◽  
Glass Ceramics ◽  
Silica Matrix ◽  
Chemical Route ◽  
Transparent Glass ◽  
Aluminosilicate Glasses ◽  
Optically Transparent ◽  
Metal Organic ◽  
Organic Precursors ◽  
Homogeneous Crystallization

ABSTRACTChemically ultra-homogeneous gels have been prepared, in the SiO2-Al2O3 system, using new metal-organic precursors with Al-O-Si linkages. By thermal treatment at 900°C, transparent monolithic gels lead to aluminosilicate glasses and above 1000°C, to optically transparent glass-ceramics (for instance by homogeneous crystallization of mullite in an amorphous silica matrix).

scholarly journals Fabrication and Crystallization of ZnO-SLS Glass Derived Willemite Glass-Ceramics as a Potential Material for Optics Applications

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Mohd Hafiz Mohd Zaid ◽  
Khamirul Amin Matori ◽  
Sidek Hj. Abdul Aziz ◽  
Halimah Mohamed Kamari ◽  
Wan Mahmood Mat Yunus ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
Structural Evolution ◽  
Linear Shrinkage ◽  
Treatment Temperature ◽  
Isothermal Heat Treatment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zinc Orthosilicate

Willemite glass-ceramics were successfully derived from conventional melt-quench ZnO-SLS precursor glass by an isothermal heat treatment process. The effect of heat treatment temperatures on the physical properties was investigated by Archimedes principle and linear shrinkage. The generation of willemite crystal phase and morphology with increase in heat treatment temperature was examined by X-ray diffraction (XRD), Fourier transform infrared (FTIR), and field emission scanning electron microscopy (FESEM) techniques. X-ray diffraction revealed that the metastableβ-Zn2SiO4and thermodynamically stable zinc orthosilicateα-Zn2SiO4phases can be observed at temperatures above 700°C. The experimental results indicated that the density and shrinkage of the glass-ceramic vary with increasing the sintering temperature. FTIR studies showed that the structure of glass-ceramic consists of SiO2and ZnO4units and exhibits the structural evolution of willemite glass-ceramics. The characteristic of strong vibrational bands can be related to theSiO44-tetrahedron corresponding to reference spectra of willemite.

Eu 3+ and Ce 3+ co-doped aluminosilicate glasses and transparent glass-ceramics containing gahnite nanocrystals

2017 ◽  
Vol 69 ◽  
pp. 372-377 ◽  
Author(s):  
M. Reza Dousti ◽  
Atiar R. Molla ◽  
Ana Candida M. Rodrigues ◽  
Andrea S.S. de Camargo
Keyword(s):  
Glass Ceramics ◽  
Transparent Glass ◽  
Aluminosilicate Glasses ◽  
Co Doped

Microcrystal Growth in Heat-Treating Process for Europium Ions Doped Aluminosilicate Glasses

2012 ◽  
Vol 193-194 ◽  
pp. 462-465
Author(s):  
Wan Guo ◽  
Xin Zhao ◽  
Shu Wen Jiang ◽  
Zhi Qiang Wang ◽  
Li Zheng ◽  
...  
Keyword(s):  
Single Phase ◽  
Secondary Particle ◽  
Glass Ceramics ◽  
Blue Emission ◽  
Heat Treating ◽  
Blue Emission Band ◽  
Aluminosilicate Glasses ◽  
Internal Network ◽  
Sem Micrograph ◽  
Narrow Emission

Eu doped YAG glass ceramics containing single phase of YAG micro-cryatals have been obtained by heat-treating the aluminosilicate precursor glasses. The primary crystallite size of YAG phase is calculated to be ~46 nm and the crystal grains grow with preffered orientation (444) in the internal network. The average secondary particle size is estimated to be ~8μm and the larger grain size is due to the particle aggregation. The pilotaxitic texture of YAG glass ceramics presented in SEM micrograph, can increase yield strength and tensile strength of the sample effectively. The emission spectrum of Eu doped YAG glass ceramics consists of a broad blue emission band and several narrow emission bands, indicating the coexistence of Eu3+ and Eu2+ ions in YAG glass ceramics.

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