Microwave Melting of Ion-Conducting Glasses

1996 ◽  
Vol 430 ◽  
Author(s):  
D. J. Duval ◽  
M. J. E. Terjak ◽  
S. H. Risbud ◽  
B. L. Phillips
Keyword(s):  
Ternary System ◽  
Microwave Heating ◽  
Color Difference ◽  
Microwave Processing ◽  
Glass Forming ◽  
Rapid Melting ◽  
Ion Conducting ◽  
Multi Mode ◽  
Better Than ◽  
Glass Compositions

AbstractGlasses of the system AgI-Ag2O-(0.95B2O3:0.05SiO2) have been formed by microwave processing using a domestic multi-mode oven operating at 900 watts and 2.45 GHz. Microwave heating resulted in rapid melting times with homogeneity in the quenched glasses equivalent to or better than conventional melting at 730°C. The glass forming region in this pseudo-ternary system is compared with the conventionally melted glass forming region in the system AgI-Ag2O-B2O3. A reversible color difference has been observed between glasses conventionally melted and those melted by microwave for all glass compositions in our system.

scholarly journals Transparent Glasses and Glass-Ceramics in the Ternary System TeO2-Nb2O5-PbF2

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 317
Author(s):  
Juliana Santos Barbosa ◽  
Gislene Batista ◽  
Sylvain Danto ◽  
Evelyne Fargin ◽  
Thierry Cardinal ◽  
...  
Keyword(s):  
Ternary System ◽  
Glass Ceramics ◽  
Rare Earth Ions ◽  
Melt Quenching ◽  
Optical Window ◽  
Synthesis Conditions ◽  
Glass Forming ◽  
Middle Infrared ◽  
Doped Glass ◽  
Glass Compositions

Transparent fluorotellurite glasses were prepared by melt-quenching in the ternary system TeO2-Nb2O5-PbF2. The synthesis conditions were adjusted to minimize fluorine loss monitored as HF release. It was found that 10 mol% of Nb2O5 is the optimum content for PbF2 incorporation up to 35 mol% in the tellurite matrix without loss of glass forming ability. Such glass compositions exhibit a wide optical window from 380 nm to about 6 μm. Crystallization properties were carefully investigated by thermal analysis and compositions with higher PbF2 contents exhibit preferential precipitation of lead oxyfluoride Pb2OF2 at lower temperatures. The lead oxyfluoride crystallization mechanism is also governed by a volume nucleation, barely reported in tellurite glasses. Eu3+ doping of these glass compositions also promotes a more efficient nucleation step under suitable heat-treatments, resulting in transparent Eu3+-doped glass-ceramics whereas undoped glass-ceramics are translucent. Finally, Eu3+ spectroscopy pointed out a progressive, more symmetric surrounding around the rare earth ions with increasing PbF2 contents as well as higher quantum efficiencies. These new fluorotellurite glass compositions are promising as luminescent hosts working in the middle infrared.

Glass-forming region in the Cd-Ge-As ternary system

1972 ◽  
Vol 22 (1) ◽  
pp. 89-92 ◽  
Author(s):  
A. Hrubý ◽  
J. Houserová
Keyword(s):  
Ternary System ◽  
Glass Forming

scholarly journals Glass forming region and optical properties of chalcogenide glasses within a gallium-tin-selenium ternary system

2020 ◽  
Vol 545 ◽  
pp. 120240
Author(s):  
Jiao Zhang ◽  
Yang Li ◽  
Chen Zhang ◽  
Feifei Chen ◽  
Xianghua Zhang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ternary System ◽  
Chalcogenide Glasses ◽  
Glass Forming

Microwave Processing of Silicon Nitride

1990 ◽  
Vol 189 ◽  
Author(s):  
T. N. Tiegs ◽  
J. O. Kiggans ◽  
H. D. Kimrey
Keyword(s):  
Silicon Nitride ◽  
Grain Boundary ◽  
Microwave Heating ◽  
Grain Growth ◽  
Microwave Power ◽  
Microwave Sintering ◽  
Microwave Processing ◽  
Microwave Furnace

ABSTRACTMicrowave sintering of Si3N4—based materials showed improved densification as compared to samples heated conventionally under similar conditions. Accelerated nitridation of Si in the microwave furnace to produce Si3N4 was also observed. Dense Si3N4, annealed by microwave heating, exhibited enhanced grain growth; however preferential coupling of the microwave power to the grain—boundary phases in the present experiments resulted in their degradation.

Thermodynamic prediction of glass forming range in Al-Mg-REM ternary system

Calphad ◽  
1998 ◽  
Vol 22 (2) ◽  
pp. 221-230 ◽  
Author(s):  
Young Kwan Kim ◽  
Jeong Ryong Soh ◽  
Hyoung Seop Kim ◽  
Hyuck Mo Lee
Keyword(s):  
Ternary System ◽  
Glass Forming ◽  
Thermodynamic Prediction

A multi-mode resonator-based UWB bandpass filter with wide stopband

2015 ◽  
Vol 8 (7) ◽  
pp. 1031-1035 ◽  
Author(s):  
Ting Zhang ◽  
Fei Xiao ◽  
Xiaohong Tang ◽  
Lei Guo
Keyword(s):  
Return Loss ◽  
Bandpass Filter ◽  
Mode Analysis ◽  
Frequency Range ◽  
Coupled Line ◽  
Resonance Characteristic ◽  
Line Section ◽  
Multi Mode ◽  
Mode Resonator ◽  
Better Than

In this paper, a novel multi-mode resonator is presented, which is formed by cascading several open-circuited transmission line sections with a coupled-line section. Owing to its symmetry, even- and odd-mode analysis methods are applied to analyze its resonance characteristic. Based on this resonator, a microstrip ultra-wide bandwidth (UWB) bandpass filter is designed, fabricated, and measured. The simulated and measured results show that its bandwidth can cover the desired UWB. Return loss in passband is better than −14 dB. This filter is featured by good selectivity and wide stopband. Stopband suppression as low as −40 dB can be achieved within frequency range from 12 to 16 GHz.

A Glass Durability Model Based on Understanding Glass Chemistry and Structural Configurations of the Glass Constituents

1996 ◽  
Vol 432 ◽  
Author(s):  
Xiangdong Feng ◽  
Todd B. Metzger
Keyword(s):  
Redox State ◽  
Composition Dependence ◽  
Structural Bond ◽  
Data Set ◽  
Consistency Test ◽  
First Order ◽  
Structural Configurations ◽  
The Individual ◽  
Better Than ◽  
Glass Compositions

AbstractAn improved structural bond strength (SBS) model has been developed to quantify the correlation between glass compositions and their chemical durabilities. The SBS model assumes that the strengths of the bonds between cations and oxygens and the structural roles of the individual elements in the glass are the predominant factors controlling the composition dependence of the chemical durability of glasses. The structural roles of oxides in glass are classified as network formers, network breakers, and intermediates. The structural roles of the oxides depend on glass composition and the redox state of oxides. A12O3, ZrO2, Fe2O3, and B2O2 are assigned as network formers only when there are sufficient alkalis to bind with these oxides. CaO can also improve durability by sharing non-bridging oxygen with alkalis, relieving Si0 2 from alkalis. The binding order to alkalis is AI2O3>ZrO2>Fe2O 2>B2O2>CaO>SiO2. The percolation phenomenon in glass is also taken into account. The concentration of network formers has to reach a critical value for a glass to become durable; durable glasses are sufficient in network formers and have a complete network structure; poor durability glasses are deficient in network formers and the network is incomplete and discontinuous. The SBS model is capable of correlating the 7-day product consistency test durability of 42 low-level waste glasses with their composition with an R2 of 0.87, which is better than 0.81 obtained with an eight-coefficient empirical first-order mixture model on the same data set.

Structural and Physical Characterization of Li2O:P2O5:MO3 (M = Cr2, Mo, W) Ion Conducting Glasses

1992 ◽  
Vol 293 ◽  
Author(s):  
B.V.R. Chowdari ◽  
K.L. Tan ◽  
W.T. Chia
Keyword(s):  
Raman Spectroscopy ◽  
Glass Transition ◽  
Transition Temperature ◽  
Photoelectron Spectroscopy ◽  
Oxygen Species ◽  
X Ray ◽  
Ion Conducting ◽  
Phosphate Groups ◽  
Glass Compositions

AbstractThe conductivity of the Li2O:P2O5:MO3 (M = Cr2, Mo, W) glasses increases as P2O5 is progressively substituted by MO3 and as the Li2O content increases. Amongst the glass compositions studied, the 0.50Li2O:0.20P2O5:0.30WO3 glass has the highest conductivity at 25°C of 2. 1×10−6 ×−1 cm−1. The glass transition temperature of the glasses increases initially with network former substitution, reaches a maximum at around MO3/P2O5 = 1, and decreases with further substitution. X-ray photoelectron spectroscopy reveals the presence of M ions in more than one oxidation state and oxygen species such as P=O, P-O-P, P-O, M-O-M, M-O and P-O-M. Raman spectroscopy shows that the Li2O:P2O5:MoO3 and Li2O:P2O5:WO3 glasses consist of PO4, MoO4 (WO4) and MoO6 (WO6) polyhedra while the Li2O:P2O5:Cr2O3 glasses consist of the PO4 and CrO6 polyhedra only. The phosphate groups are preferentially modified by Li2O in comparison with the tungstate, molybdate and chromate groups. The increasing number of non-bridging oxygen atoms per phosphate group may be related to the increasing conductivity with the progressive substitution of MO3 for P2O5.

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