ChemInform Abstract: ELECTRICAL CONDUCTIVITY-DIFFERENTIAL THERMAL ANALYSIS MEASUREMENT ON SOME M(N)HGJ4 COMPLEXES

1973 ◽  
Vol 4 (52) ◽  
pp. no-no
Author(s):  
Z. HALMOS ◽  
W. W. WENDLANDT
Keyword(s):  
Thermal Analysis ◽  
Electrical Conductivity ◽  
Differential Thermal Analysis ◽  
Differential Thermal Analysis Measurement ◽  
Analysis Measurement

Influence of solidification rate on precipitation and microstructure of directional solidification IN792 + Hf superalloy

1999 ◽  
Vol 14 (10) ◽  
pp. 3873-3881 ◽  
Author(s):  
W. R. Sun ◽  
Z. Q. Hu ◽  
J. H. Lee ◽  
S. M. Ceo ◽  
S. J. Choe
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Grain Boundaries ◽  
Directional Solidification ◽  
Solidification Rate ◽  
Residual Liquid ◽  
Phase Precipitation ◽  
Differential Thermal Analysis Measurement ◽  
Solidification Sequence ◽  
Analysis Measurement

The effect of solidification rate on the precipitation and microstructure of directional solidification IN792 + Hf alloy was studied. The solidification sequence and the initial precipitation temperature of different phases were determined by the observation of the quenched microstructure combined with the differential thermal analysis measurement. The script carbide was turned into faceted carbide with the drop of solidification rate. It was concluded by microstructure analysis that the faceted carbide was pushed by the γ solid front before it was captured. The incorporation of γ phase into the faceted carbide was due to the dendrite growth of the carbide toward one point and the mergence of the dendrites. Some long carbide bars were formed along the grain boundaries by continual reaction of eutectic (γ + MC carbide) at a solidification rate of 0.5 μm/s. Two zones, the γ′ forming elements enriched zone and depleted zone, were found in the residual liquid area. Eutectic γ/γ′ nucleated in the γ′ forming elements enriched zone. The η-phase precipitation was controlled by the ratio of (Ti + Hf + Ta + W)/Al in the residual liquid. The growth of eutectic γ/γ′ increased the ratio and induced the η-phase precipitation. A lower solidification rate decreased the ratio by sufficient diffusion and hence efficiently suppressed the η-phase precipitation.

Mechanical Properties, Electrical Conductivity and Differential Thermal Analysis of Lithium Sulphate with Small Quantities of Potassium Sulphate

1967 ◽  
Vol 22 (8) ◽  
pp. 1177-1180 ◽  
Author(s):  
Bengt Augustsson ◽  
Arnold Kvist
Keyword(s):  
Mechanical Properties ◽  
Thermal Analysis ◽  
Phase Diagram ◽  
Electrical Conductivity ◽  
Differential Thermal Analysis ◽  
Potassium Sulphate ◽  
Lithium Sulphate ◽  
New Phase

Previously obtained conductivity and viscosity results for the system (Li,K)2SO4 with less than 3 mole% K2SO4 show bad agreement with the phase diagram given in the literature. From conductivity, viscosity and differential thermal analysis we have constructed a new phase diagram for these concentrations.

Thermal analysis studies of oxygen chemisorption on nanocrystalline SnO2

2000 ◽  
Vol 15 (9) ◽  
pp. 1994-1997 ◽  
Author(s):  
C. H. Shek ◽  
G. M. Lin
Keyword(s):  
Thermal Analysis ◽  
Electrical Conductivity ◽  
Grain Size ◽  
Differential Thermal Analysis ◽  
Steady State ◽  
Conductivity Measurement ◽  
Electrical Conductivity Measurement ◽  
Heats Of Adsorption ◽  
Temperature Range ◽  
Oxygen Chemisorption

The oxygen chemisorption on nanocrystalline SnO2 at temperature range between 100 and 450 °C was studied with differential thermal analysis (DTA) and electrical conductivity measurement. The O2−, O−, and O2m ionosorptions were observed and could be distinguished from each other only on nanocrystalline SnO2 with grain size less than 5 nm. Assuming steady-state adsorption, the heats of adsorption for O2− and O− (or O2−) on nanocrystalline SnO2 are 1.09 and 1.50 eV respectively from the results of DTA.

scholarly journals Electrical conductivity of the ionic conductor tetragonal (Bi2O3)1-x(Eu2O3)x

Cerâmica ◽  
2011 ◽  
Vol 57 (342) ◽  
pp. 185-192 ◽  
Author(s):  
S. Yilmaz ◽  
O. Turkoglu ◽  
M. Ari ◽  
I. Belenli
Keyword(s):  
Phase Transition ◽  
Thermal Analysis ◽  
Electrical Conductivity ◽  
Differential Thermal Analysis ◽  
Doping Concentration ◽  
Binary Systems ◽  
Ionic Conductor ◽  
Probe Technique ◽  
Β Phase ◽  
Concentration Dependences

Electrical conductivity of tetragonal β-phase (Bi2O3)1-x(Eu2O3)x (0.01 ≤ x ≤ 0.10 %mol) ceramic systems were investigated. The temperature and doping concentration dependences of the electrical conductivity were studied by four-point probe technique. The electrical conductivity increases with the increasing doping concentration and temperature. The highest value of the electrical conductivity is 0.013 Ω-1cm-1 (x = 0.05, 750 ºC) for the β-phase at 670 ºC and 0.57 Ω-1cm-1 (x=0.05, 800 ºC) in binary systems at 690 ºC. The phase transition which manifests itself by the jump in the conductivity curves was seen and verified by differential thermal analysis measurements. The activation energies of the samples were found to be about 0.71-1.57 eV.

Investigation of AgI-Based Solid Solutions with Ag2CO3

Technologies ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 54
Author(s):  
Kento Uchida ◽  
Yuta Matsushima
Keyword(s):  
Thermal Analysis ◽  
Electrical Conductivity ◽  
Differential Thermal Analysis ◽  
Solid Solutions ◽  
Conductivity Measurement ◽  
Solubility Limit ◽  
Reaction Products ◽  
Electrical Conductivity Measurement ◽  
Rich Region ◽  
Silver Carbonate

The formation phenomena of silver carbonate (Ag2CO3)–silver iodide (AgI) solid solutions were investigated by X-ray diffraction, thermogravimetry-differential thermal analysis, and electrical conductivity measurement. Results revealed that AgI and Ag2CO3 reacted with each other when mixed at room temperature. The reaction products were classified into three types: (1) AgI-based solid solutions in the AgI-rich region for x = 10% or less in x Ag2CO3–(1 − x) AgI; (2) Ag2CO3-based solid solutions in the Ag2CO3-rich region for x = 60% or more; and (3) silver carbonate iodides in the intermediate range for x between 10% and 60%. For the AgI-based solid solutions, the incorporation of Ag2CO3 into the AgI lattice expanded the unit cell and enhanced electrical conductivity. The solubility limit of Ag2CO3 into the AgI lattice estimated from the differential thermal analysis was x ≈ 5%.

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