Effects of Mechanical Alloying and Grinding on the Preparation and Thermoelectric Properties of β-FeSi 2 ( Overview )
TLDR
In this paper, the effects of mechanical alloying (MA) and grinding (MG) on the preparation processes as well as on the thermoelectric properties of semiconducting β-FeSi 2 were reviewed.Abstract:
Improving effects of mechanical alloying (MA) and grinding (MG) on the preparation processes as well as on the thermoelectric properties of semiconducting β-FeSi 2 were reviewed. MA and MG strongly accelerates the preparation reaction to form β-phase from elemental powders and from the mixture of α-Fe 2 Si 5 and e-FeSi. The electrical resistivity significantly decreased due to the dispersion of fine particles of metallic phase, e.g. e-FeSi phase. As a result, the power factor Q 2 /ρ was significantly improved. Figure of merit Z = Q 2 /ρκ was also improved by MA and MG due to the decrease in the thermal conductivity K. This is due to a decrease in grain size of the β-phase which causes an increase in phonon scattering at the grain boundaries. MA and MG are promissing techniques for the acceleration of β-FeSi 2 formation as well as the improvement of the thermoelectric properties of β-FeSi 2 .read more
Citations
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Generality of the 18-n Rule: Intermetallic Structural Chemistry Explained through Isolobal Analogies to Transition Metal Complexes.
TL;DR: The 18-n rule is established as a framework for interpreting the stability of 341 intermetallic phases and anticipating their properties through analyses of 34 binary structure types.
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Synthesis of CoSb3 skutterudite by mechanical alloying
TL;DR: In this paper, elemental powder mixtures with an atomic ratio of Co:Sb=1:3 were mechanically alloyed by high-energy ball milling in a planetary ball mill.
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Effects of P doping on the thermoelectric properties of β-FeSi2
TL;DR: In this article, the effects of P substitution for Si as an n-type dopant on the thermoelectric properties of hot-pressed β-FeSi2 were investigated, and the Seebeck coefficient, electrical resistivity, and thermal conductivity of the FeSi2−xPx were measured from room temperature to 1100 K.
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Effect of copper addition on the β-phase formation rate in FeSi2 thermoelectric materials
TL;DR: In this paper, the transformation kinetics of the β-phase from an as-solidified structure composed of α and e in the Fe-Si system was investigated by using rapidly, unidirectionally or conventionally solidified FeSi2 alloys containing a small amount of Cu (0.1-1 at%).
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Microstructure and thermoelectric properties of p-type Fe0.9Mn0.1Si2 compounds prepared by pressureless sintering
TL;DR: The microstructure and thermoelectric properties of porous p-type Fe0.9Mn0.1Si2 compounds fabricated by pressureless sintering were investigated in this article.
References
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Preparation of ‘‘amorphous’’ Ni60Nb40 by mechanical alloying
TL;DR: In this paper, X-ray diffraction was used to follow the progress of the mechanical alloying which eventually produced "amorphous" diffraction patterns similar to those for liquid quenched amorphous Ni60Nb40.
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Amorphization by ball milling. A review
Arthur Weeber,Hans Bakker +1 more
TL;DR: In this paper, a new method for the preparation of amorphous alloys is the mechanical alloying process, and criteria for amorphization and a method to determine the glass forming range of TM-TM systems are given.
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The synthesis of amorphous NiTi alloy powders by mechanical alloying
R.B Schwarz,R.R Petrich,C.K Saw +2 more
TL;DR: In this article, high-energy ball milling was used to alloy polycrystalline powders of Ni and Ti in an inert atmosphere at T < 240 K. The alloyed NixTi1−x powders were characterized by scanning electron microscopy, X-ray diffraction, and differential scanning calorimetry.
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Nanocrystalline metals prepared by high-energy ball milling
TL;DR: In this paper, the synthesis of completely nanocrystalline metals by high-energy deformation processes was studied, and the results showed that pure metals with body-centered cubic (bcc) and hexagonal close-packed (hcp) structures are subjected to ball milling, resulting in a decrease of the average grain size to ≈9 nm for metals with bcc and to ≆13 nm for metal with hcp crystal structures.
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Structural and thermodynamic properties of heavily mechanically deformed Ru and AlRu
TL;DR: In this paper, the authors report on high energy ball milling of Ru and AlRu and show that the deformation results in a drastic decrease of the crystal size to a nanometer scale and an increase of atomic-level strain.