scholarly journals Long-term stability of phase-separated half-Heusler compounds

2015 ◽  
Vol 17 (44) ◽  
pp. 29854-29858 ◽  
Author(s):  
J. Krez ◽  
B. Balke ◽  
S. Ouardi ◽  
S. Selle ◽  
T. Höche ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Heusler Compounds ◽  
Dendritic Microstructure ◽  
Low Thermal Conductivity ◽  
Term Stability ◽  
Long Term Stability ◽  
Heating And Cooling ◽  
P Type

The long-term stability of n- and p-type thermoelectric half-Heusler materials is investigated. The dendritic microstructure is temperature resistant and maintained the low thermal conductivity values (κ < 4 W m−1 K−1) even after 500 heating and cooling cycles.

Long-Term Stability of (Ti/Zr/Hf)CoSb1−xSnxThermoelectric p-Type Half-Heusler Compounds Upon Thermal Cycling

2015 ◽  
Vol 3 (12) ◽  
pp. 1217-1224 ◽  
Author(s):  
Elisabeth Rausch ◽  
Benjamin Balke ◽  
Siham Ouardi ◽  
Claudia Felser
Keyword(s):  
Thermal Cycling ◽  
Heusler Compounds ◽  
Term Stability ◽  
Long Term Stability ◽  
P Type

scholarly journals Optimization of performance and long-term stability of p-type dye-sensitized solar cells with a cycloruthenated dye through electrolyte solvent tuning

2017 ◽  
Vol 1 (3) ◽  
pp. 626-635 ◽  
Author(s):  
Nathalie Marinakis ◽  
Markus Willgert ◽  
Edwin C. Constable ◽  
Catherine E. Housecroft
Keyword(s):  
Solar Cells ◽  
Dye Sensitized Solar Cells ◽  
Photoconversion Efficiency ◽  
Term Stability ◽  
Long Term Stability ◽  
Dye Sensitized ◽  
Ruthenium Dye ◽  
P Type ◽  
Sensitized Solar Cells

The balance between optimal photoconversion efficiency and long-term stability in p-type DSCs with a cyclometallated ruthenium dye is presented, with mixtures of acetonitrile and propionitrile being the best solvent with an I3−/I− redox couple.

Long term stability of gate-oxides on n- and p-type silicon carbide studied by charge injection techniques

1997 ◽  
Vol 46 (1-3) ◽  
pp. 263-266 ◽  
Author(s):  
E.G. Stein von Kamienski ◽  
C. Leonhard ◽  
F. Portheine ◽  
A. Gölz ◽  
H. Kurz
Keyword(s):  
Silicon Carbide ◽  
Charge Injection ◽  
Gate Oxides ◽  
Term Stability ◽  
Long Term Stability ◽  
Type Silicon ◽  
Injection Techniques ◽  
P Type

Minimum Volume Pressing of Greasy Wool

1988 ◽  
Vol 58 (1) ◽  
pp. 43-50 ◽  
Author(s):  
G. W. Walls
Keyword(s):  
Minimum Volume ◽  
Ambient Temperatures ◽  
Term Stability ◽  
Long Term Stability ◽  
Lower Weight ◽  
Heating And Cooling ◽  
Actual Volume ◽  
Product Volume ◽  
Wool Yield

Greasy wool preheated to 90°C can be compressed in one press minute to over 1000 kg/m3 using about one-third of the pressure needed at ambient temperatures, and then cooled out-of-press to give long-term stability of compressed density similar to that obtained by maintaining the pressure during in-press heating and cooling. Minimum total volume, the actual volume of wool plus contaminants with air excluded, can almost be achieved at pressures below 5 MPa. At higher pressures, product volume is reduced by the volume of extra grease squeezed out for recovery, resulting in a higher wool yield product of lower weight.

Novel Low Thermal Conductivity Ceramic Materials for Thermal Barrier Coatings

2007 ◽  
Vol 280-283 ◽  
pp. 1497-1500 ◽  
Author(s):  
Wei Pan ◽  
Qiang Xu ◽  
Long Hao Qi ◽  
Jing Dong Wang ◽  
He Zhuo Miao ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Barrier Coatings ◽  
Gas Turbines ◽  
Ceramic Materials ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Low Thermal Conductivity ◽  
Long Term Stability ◽  
Sintering Behaviour

The increase of the efficiency for gas turbines leads to the increasing combustion-chambertemperatures. Rapid degradation of the conventional yttria-stabilized zirconia coatings does not fulfill therequirements at these temperatures for a reliable thermal barrier coatings (TBCs) due to the phasetransformation of zirconia and the sintering behaviour. Therefore, it is very important to develop novelceramic materials for TBCs with low thermal conductivity and long-term stability at high temperatures.In this paper, the developments of potential novel ceramic materials for TBCs with low thermalconductivity are reviewed.

Titanium Tungsten (TiW) for Ohmic contacts to n-and p-type 4H-SiC

2000 ◽  
Vol 640 ◽  
Author(s):  
S.-K. Lee ◽  
C.-M. Zetterling ◽  
M. Östling
Keyword(s):  
High Temperature ◽  
Contact Resistance ◽  
Ohmic Contacts ◽  
Specific Contact Resistance ◽  
Term Stability ◽  
Long Term Stability ◽  
Ohmic Behavior ◽  
Specific Contact ◽  
P Type

ABSTRACTIn the present work, we investigated sputtered titanium tungsten (TiW) contacts for Ohmic contacts to both n- and p-type 4H-SiC with long-term stability under high temperature (500°C).. Epitaxial layers with a doping concentration of 1.3×1019 and 6×1018 cm−3 were used. After high temperature annealing (>950°C) sputtered TiW contacts showed Ohmic behavior with good uniform distribution of the specific contact resistance. We obtained an average specific contact resistance (pc) of 4×10−5 Ωcm2 and 1.2 ∼ 1.7×10−4 Ωcm2 for p- and n-type, respectively from linear TLM measurement. We also found some variation of the specific contact resistance and the sheet resistance from our TLM measurement for p-type contacts. We will discuss this behavior with the measurement of SIMS. Long-term stability with a top-cap layer is also discussed

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