Effect of phase transformation in higher iron silicide on the electrical conductivity of the multiphase system iron silicide-glass. I. Conductivity mechanisms in a composite, prepared on the basis of iron silicides and barium-borosilicate glass

1992 ◽  
Vol 31 (8) ◽  
pp. 693-696
Author(s):  
S. I. Vecherskii ◽  
F. A. Sidorenko
Keyword(s):  
Electrical Conductivity ◽  
Phase Transformation ◽  
Borosilicate Glass ◽  
Iron Silicide ◽  
Multiphase System ◽  
Iron Silicides ◽  
Barium Borosilicate Glass

scholarly journals Pressure-Induced Structural Phase Transition and Metallization in Ga2Se3 up to 40.2 GPa under Non-Hydrostatic and Hydrostatic Environments

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 746
Author(s):  
Meiling Hong ◽  
Lidong Dai ◽  
Haiying Hu ◽  
Xinyu Zhang
Keyword(s):  
Phase Transition ◽  
Electrical Conductivity ◽  
High Pressure ◽  
Phase Transformation ◽  
Transport Properties ◽  
Electrical Transport ◽  
Structural Phase ◽  
Structure Evolution ◽  
Systematic Research ◽  
Electrical Transport Properties

A series of investigations on the structural, vibrational, and electrical transport characterizations for Ga2Se3 were conducted up to 40.2 GPa under different hydrostatic environments by virtue of Raman scattering, electrical conductivity, high-resolution transmission electron microscopy, and atomic force microscopy. Upon compression, Ga2Se3 underwent a phase transformation from the zinc-blende to NaCl-type structure at 10.6 GPa under non-hydrostatic conditions, which was manifested by the disappearance of an A mode and the noticeable discontinuities in the pressure-dependent Raman full width at half maximum (FWHMs) and electrical conductivity. Further increasing the pressure to 18.8 GPa, the semiconductor-to-metal phase transition occurred in Ga2Se3, which was evidenced by the high-pressure variable-temperature electrical conductivity measurements. However, the higher structural transition pressure point of 13.2 GPa was detected for Ga2Se3 under hydrostatic conditions, which was possibly related to the protective influence of the pressure medium. Upon decompression, the phase transformation and metallization were found to be reversible but existed in the large pressure hysteresis effect under different hydrostatic environments. Systematic research on the high-pressure structural and electrical transport properties for Ga2Se3 would be helpful to further explore the crystal structure evolution and electrical transport properties for other A2B3-type compounds.

The Use of Hot-Isostatic Pressing to Process Nuclear Waste Forms

2009 ◽  
Author(s):  
Martin W. A. Stewart ◽  
Sam A. Moricca ◽  
Tina Eddowes ◽  
Yingjie Zhang ◽  
Eric R. Vance ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Nuclear Waste ◽  
Borosilicate Glass ◽  
Hot Isostatic Pressing ◽  
Processing Technology ◽  
Nuclear Wastes ◽  
Isostatic Pressing ◽  
Waste Forms ◽  
Nuclear Waste Forms ◽  
Glass Viscosity

ANSTO has developed a combination of tailored nuclear waste form chemistries coupled with the use of flexible hot-isostatic pressing processing technology to enable the successful incorporation of problematic nuclear wastes into dense, durable monoliths. This combined package also enables the design of waste forms with waste loadings well in excess of those achievable via baseline melting routes using borosilicate glass, as hot-isostatic pressing is not constrained by factors such as glass viscosity, crystallisation and electrical conductivity. In this paper we will discuss some of our experiences with problematic wastes, namely plutonium wastes, sludges and HLW such as the Idaho calcines.

scholarly journals The Application of Fluorinated Aromatic Dimethacrylates to Experimental Light-cured Radiopaque Composite Resin, Containing Barium-Borosilicate Glass Filler

1993 ◽  
Vol 12 (1) ◽  
pp. 1-11,89 ◽  
Author(s):  
Jiro TANAKA ◽  
Kohichi INOUE ◽  
Hiroyuki MASAMURA ◽  
Kazuyoshi MATSUMURA ◽  
Hiroyuki NAKAI ◽  
...  
Keyword(s):  
Borosilicate Glass ◽  
Composite Resin ◽  
Barium Borosilicate Glass ◽  
Glass Filler

The incorporation of Li2SO4 into barium borosilicate glass for nuclear waste immobilisation

2021 ◽  
pp. 162746
Author(s):  
Rifat Farzana ◽  
Pranesh Dayal ◽  
Inna Karatchevtseva ◽  
Zaynab Aly ◽  
Daniel J. Gregg
Keyword(s):  
Nuclear Waste ◽  
Borosilicate Glass ◽  
Barium Borosilicate Glass

Barium (Zinc) Borosilicate Sealing Glass and Joining Interface with YSZ Electrolyte and Crofer22APU Interconnect in SOFCs

2018 ◽  
Vol 283 ◽  
pp. 72-77
Author(s):  
Namthip Kingnoi ◽  
Jiratchaya Ayawanna ◽  
Nattapol Laorodphan
Keyword(s):  
Borosilicate Glass ◽  
Glass Ceramic ◽  
Joint Interface ◽  
Negative Effect ◽  
Ceramic Electrolytes ◽  
Formation Of Cracks ◽  
Barium Borosilicate Glass ◽  
Metallic Interconnects ◽  
Ysz Electrolyte ◽  
Zinc Borosilicate

This work describes the performance of two glass-ceramic compositions, BaO-SiO2-B2O3 (Barium borosilicate glass: BaBS) and BaO-ZnO-SiO2-B2O3 (Barium zinc borosilicate glass: BaBS−Zn), used for joining YSZ ceramic electrolytes and Crofer22APU metallic interconnects in solid oxide fuel cells (SOFCs) working at 800°C for 50 h. ZnO had a negative effect on the thermal expansion coefficient (TEC) value of the BaBS-Zn glass-ceramic. XRD and SEM results revealed the formation of rod-shaped barium zinc silicate crystalline phases in the BaBS-Zn glass, which was accompanied by cracks and poor adherence at the YSZ/BaBS-Zn joint interface after working at 800°C for 50 h. The formation of cracks parallel to the interface between the Crofer22APU interconnect and the BaBS-Zn glass-ceramic sealant was observed due to the severe TEC mismatch. The BaBS glass–ceramic adhered well to the YSZ electrolyte as well as the pre-oxidized Crofer22APU without cracks. Chromium oxide scale developed between the pre-oxidized Crofer22APU/BaBS glass-ceramic joint interface with increasing the pre-oxidation temperature. This study shows that BaBS glass-ceramic is more effective than BaBS-Zn as a sealant for joining YSZ electrolytes and Crofer22APU metallic interconnects in SOFCs working at 800°C for 50 h.

Dynamics of Phase Transformation of Cu-Ni-Si-Zr-Cr Alloy during Aging Precipitation

2012 ◽  
Vol 490-495 ◽  
pp. 3109-3113
Author(s):  
Xiang Peng Xiao ◽  
Bai Qing Xiong ◽  
Qiang Song Wang ◽  
Guo Liang Xie ◽  
Li Jun Peng
Keyword(s):  
Electrical Conductivity ◽  
Phase Transformation ◽  
Volume Fraction ◽  
Solution Treatment ◽  
Avrami Equation ◽  
Transformation Kinetics ◽  
Transformation Ratio ◽  
Aging Precipitation ◽  
Effects Of Aging ◽  
New Phase

The effects of aging temperature and aging time on properties of Cu-2.1Ni-0.5Si -0.2Zr-0.05Cr (wt.%) alloy were studied. The transformation ratio of new phase in Cu-2.1Ni-0.5Si-0.2Zr-0.05Cr alloy was calculated when aging at 400°C, 450°C and 500°C by measuring electrical conductivity, the relation between the electrical conductivity and the quantity of new phase. The Avrami-equation of phase transformation kinetics and the Avrami-equation of electrical conductivity during aging were established for Cu-2.1Ni-0.5Si-0.2Zr-0.05Cr alloy, on the basis of linear relationship between the electric conductivity and the volume fraction of precipitates. The calculated values of electrical conductivity well consistent with those of experiment can provide reference on the alloy of production process. The characteristics of precipitates in the alloy after solution treatment and cold rolling were established, and the results show the precipitate was δ-Ni2Si phase.

EPR in a barium borosilicate glass containing titanium ions

1979 ◽  
Vol 14 (9) ◽  
pp. 2215-2224 ◽  
Author(s):  
B. S. Rawal ◽  
J. T. Warden
Keyword(s):  
Borosilicate Glass ◽  
Barium Borosilicate Glass
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