Solubility Limit and Annealing Effects on the Microstructure & Thermoelectricproperties of Fe 2V 1-XTa xAl 1-YSi y Heusler Compounds

2021 ◽  
Author(s):  
Fabian Garmroudi ◽  
Michael Parzer ◽  
Alexander Riss ◽  
Nikolas Reumann ◽  
Bernhard Hinterleitner ◽  
...  
Keyword(s):  
Solubility Limit ◽  
Heusler Compounds ◽  
Annealing Effects

scholarly journals Solubility limit and annealing effects on the microstructure & thermoelectric properties of Fe2V1−xTaxAl1−ySiy Heusler compounds

2021 ◽  
pp. 116867
Author(s):  
Fabian Garmroudi ◽  
Michael Parzer ◽  
Alexander Riss ◽  
Nikolas Reumann ◽  
Bernhard Hinterleitner ◽  
...  
Keyword(s):  
Thermoelectric Properties ◽  
Solubility Limit ◽  
Heusler Compounds ◽  
Annealing Effects

Phase Stability and Thermoelectric Properties of Half-Heusler Compounds (Ti,M)NiSn (M = Zr, Hf)

2009 ◽  
Vol 1218 ◽  
Author(s):  
Takahiro Kenjo ◽  
Yoshisato Kimura ◽  
Yoshinao Mishima
Keyword(s):  
Thermoelectric Properties ◽  
Single Phase ◽  
Lattice Thermal Conductivity ◽  
Phonon Scattering ◽  
Solubility Limit ◽  
Zone Melting ◽  
Heusler Compounds ◽  
Floating Zone ◽  
Heusler Phase ◽  
Ti Addition

AbstractAiming to improve thermoelectric properties of half-Heusler compounds MNiSn (M = Ti, Zr, Hf), phase equilibria in the (Ti,M)NiSn systems have been investigated focusing on the half-Heusler phase separation between TiNiSn and ZrNiSn, TiNiSn and HfNiSn. Solubility limit of an element M in each half-Heusler phase was determined by XRD and EPMA. Nearly single phase alloys were fabricated by the directional solidification using optical floating zone melting method to evaluate intrinsic thermoelectric properties of the alloys. Lattice thermal conductivity can be reduced in (Ti,M)NiSn alloys by phonon scattering due to the solid solution effect of M site substitution. Moreover, electrical properties can be enhanced by the Ti addition in (Ti,Zr)NiSn alloys. Among present MNiSn alloys, (Ti0.15,Zr0.85)NiSn alloy has the highest power factor of 5.3 mWm-1K-2 at around 745 K.

Experimental and Theoretical Comparable Study of Pure and Zinc Porphyrin Surface Modified ZnO Nanorod Arrays for Hybrid Solar Cell Applications

2020 ◽  
pp. 114-119
Keyword(s):  
Solar Cell ◽  
Electrochemical Impedance ◽  
Hybrid Solar Cell ◽  
Cell Performance ◽  
Solar Cell Performance ◽  
Solar Cell Efficiency ◽  
Cell Efficiency ◽  
Annealing Effects ◽  
Vertically Aligned ◽  
Surface Modified

Experimental and theoretical study Porphyrin-grafted ZnO nanowire arrays were investigated for organic/inorganic hybrid solar cell applications. Two types of porphyrin – Tetra (4-carboxyphenyle) TCPP and meso-Tetraphenylporphine (Zinc-TPP)were used to modify the nanowire surfaces. The vertically aligned nanowires with porphyrin modifications were embedded in graphene-enriched poly (3-hexylthiophene) [G-P3HT] for p-n junction nanowire solar cells. Surface grafting of ZnO nanowires was found to improve the solar cell efficiency. There are different effect for the two types of porphyrin as results of Zn existing. Annealing effects on the solar cell performance were investigated by heating the devices up to 225 °C in air. It was found that the cell performance was significantly degraded after annealing. The degradation was attributed to the polymer structural change at high temperature as evidenced by electrochemical impedance spectroscopy measurements.

Evaporation of lignin-lean black liquor

TAPPI Journal ◽  
2015 ◽  
Vol 14 (7) ◽  
pp. 441-450
Author(s):  
HENRIK WALLMO, ◽  
ULF ANDERSSON ◽  
MATHIAS GOURDON ◽  
MARTIN WIMBY
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Black Liquor ◽  
Salt Content ◽  
Solubility Limit ◽  
Lignin Removal ◽  
Kraft Black Liquor ◽  
Black Liquors ◽  
The Heat Transfer Coefficient

Many of the pulp mill biorefinery concepts recently presented include removal of lignin from black liquor. In this work, the aim was to study how the change in liquor chemistry affected the evaporation of kraft black liquor when lignin was removed using the LignoBoost process. Lignin was removed from a softwood kraft black liquor and four different black liquors were studied: one reference black liquor (with no lignin extracted); two ligninlean black liquors with a lignin removal rate of 5.5% and 21%, respectively; and one liquor with maximum lignin removal of 60%. Evaporation tests were carried out at the research evaporator in Chalmers University of Technology. Studied parameters were liquor viscosity, boiling point rise, heat transfer coefficient, scaling propensity, changes in liquor chemical composition, and tube incrustation. It was found that the solubility limit for incrustation changed towards lower dry solids for the lignin-lean black liquors due to an increased salt content. The scaling obtained on the tubes was easily cleaned with thin liquor at 105°C. It was also shown that the liquor viscosity decreased exponentially with increased lignin outtake and hence, the heat transfer coefficient increased with increased lignin outtake. Long term tests, operated about 6 percentage dry solids units above the solubility limit for incrustation for all liquors, showed that the heat transfer coefficient increased from 650 W/m2K for the reference liquor to 1500 W/m2K for the liquor with highest lignin separation degree, 60%.

scholarly journals Synthesis and post-annealing effects of alkaline-metal-ethylenediamine-intercalated superconductors A(C2H8N2) Fe2−Se2 (A= Li, Na) with Tc= 45 K

2014 ◽  
Vol 504 ◽  
pp. 8-11 ◽  
Author(s):  
Takashi Noji ◽  
Takehiro Hatakeda ◽  
Shohei Hosono ◽  
Takayuki Kawamata ◽  
Masatsune Kato ◽  
...  
Keyword(s):  
Alkaline Metal ◽  
Post Annealing ◽  
Annealing Effects
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