scholarly journals Synthesis and characterization of monophase CaO-TiO2-SiO2 (sphene) based glass-ceramics

2020 ◽  
Vol 52 (1) ◽  
pp. 41-52
Author(s):  
Jelena Maletaskic ◽  
Bratislav Todorovic ◽  
Martina Gilic ◽  
Milena Marinovic-Cincovic ◽  
Katsumi Yoshida ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Thermal Analyses ◽  
Glass Ceramics ◽  
Ceramic Materials ◽  
Host Lattice ◽  
Powder Morphology ◽  
Waste Immobilization ◽  
Ft Ir ◽  
Nuclear Waste Immobilization

Sphene based glass-ceramics (CaTiSiO5), an excellent candidate for a host lattice of ceramic materials and for nuclear waste immobilization, has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibro-milling for homogenization. Starting powders were melted at 1400?C for 2 h, cooled to room temperature, grounded again, then crystallized by thermal treatment yielding a sphene glass-ceramic. The evolution of the phase composition during thermal treatment was investigated by X-ray powder diffraction (XRPD), FT-IR, Raman and thermal analyses (TG-DTA). Pure synthetic single phase sphene was formed at 800?C for 4 h, even it is very hard to obtain monophase powder at such low temperature. Powder morphology was analyzed by scanning electron microscopy (SEM).

scholarly journals An Interdisciplinary View of Interfaces: Perspectives Regarding Emergent Phase Formation

2017 ◽  
Vol 15 (1) ◽  
Author(s):  
Kyle S. Brinkman
Keyword(s):  
Phase Formation ◽  
Imaging Techniques ◽  
Three Dimensional ◽  
Interdisciplinary Approach ◽  
Solution Calorimetry ◽  
Waste Immobilization ◽  
Multiphase Systems ◽  
Diverse Application ◽  
Nuclear Waste Immobilization

A perspective on emergent phase formation is presented using an interdisciplinary approach gained by working at the “interface” between diverse application areas, including solid oxide fuel cells (SOFCs) and ionic membrane systems, solid state lithium batteries, and ceramics for nuclear waste immobilization. The grain boundary interfacial characteristics of model single-phase materials in these application areas, including (i) CeO2, (ii) Li7La3Zr2O12 (LLZO), and (iii) hollandite of the form BaxCsyGa2x+yTi8-2x-yO16, as well as the potential for emergent phase formation in composite systems, are discussed. The potential physical properties resulting from emergent phase structure and distribution are discussed, including an overview of existing three-dimensional (3D) imaging techniques recently used for characterization. Finally, an approach for thermodynamic characterization of emergent phases based on melt solution calorimetry is outlined, which may be used to predict the energy landscape including phase formation and stability of complex multiphase systems.

scholarly journals Glass-ceramics for nuclear-waste immobilization

MRS Bulletin ◽  
2017 ◽  
Vol 42 (03) ◽  
pp. 233-240 ◽  
Author(s):  
John S. McCloy ◽  
Ashutosh Goel
Keyword(s):  
Nuclear Waste ◽  
Glass Ceramics ◽  
Waste Immobilization ◽  
Nuclear Waste Immobilization ◽  
Image Position

Abstract

Sol-Gel Processing of Glasses and Glass-Ceramics for Microelectronic Packaging

1991 ◽  
Vol 249 ◽  
Author(s):  
M.A. Sriram ◽  
P.N. Kumta
Keyword(s):  
Dielectric Constant ◽  
Thermal Analyses ◽  
Sol Gel ◽  
Glass Ceramics ◽  
Signal Propagation ◽  
Ceramic Materials ◽  
X Ray Diffraction ◽  
Low Dielectric ◽  
Heat Treated ◽  
Gel Processing

In recent years considerable progress has been made in electronic packaging substrate technology. The future need of miniaturization of devices to increase the signal processing speeds calls for an increase in the device density requiring the substrates to be designed for better thermal, mechanical and electrical efficiency.Fast signal propagation with minimum delay requires the substrate to possess very low dielectric constant. Several glasses and glass-ceramic materials have been identified over the years which show good promise as candidate substrate materials. Among these borophosphate and borophosphosilicate glass-ceramics have been recently identified to have the lowest dielectric constant (3.8). Sol-gel processing has been used to synthesize borosilicate, borophosphosilicate and borophosphate glasses and glass-ceramics using inexpensive boron oxide and phosphorus pentoxide precursors. Preliminary results of the processing of these gels and the effect of volatility of boron alkoxide and its modification on the gel structure are described. X-ray diffraction, Differential thermal analyses and FTIR have been used to characterize the as-prepared and heat treated gels.

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