ball milling germanium

Freestanding Ge NCs down to ∼7 nm size are synthesized by using the ball milling technique and investigated regarding the nature of strain. Detailed analysis of …

To assess the damage degree of ball-milling time to the GO nanosheets, Raman spectra of 0.5 wt% GO-Cu powders after ball-milling for different time are shown in Fig. 5. The results show that D band and G band of the GO nanosheets are typically located at around 1349 cm −1 and 1595 cm −1, respectively.

Samples of Si 80 Ge 20 P 2 were prepared by milling the elements in their stoichiometric ratio at 500 rpm in a planetary mill which filled with Ar gas to avoid the influence of oxidation. For fabricating such n-type material, phosphorus (P) powder (99%) was added to silicon (Si) (99.99%, Alfa Aesar) and germanium (Ge) (99.99%, Alfa …

Multi-axis diamond milling can be divided into two main types according to the installing method of the diamond tool, namely ball end milling and raster milling [16] [17] [18]. In ball end milling ...

This work is the first simple, efficient in situ synthesis of Ge NPs, with an excellent structure, wrapped with few-layer graphene sheets (abbreviated as Ge@FLG) from commercial Ge powders and natural graphite by a one-step ball-milling process assisted by dielectric-barrier discharge plasma. Because of their unique structure, Ge@FLG electrodes ...

Later, Ouyang et al. [11] have demonstrated plasma assisted ball milling technique and prepared germanium nano particles wrapped with graphene produced from commercial Ge powders and natural graphite with reasonable electrochemical performance. It is demonstrated that poor or/and relatively low electrochemical performance of any …

The paper reports on the crystal-to-amorphous phase transition induced by ball milling in a pure element: a germanium powder. Scanning electron micrographs …

After continuous milling, a small amount of ball-milled powder (0.3 - 0.6 g) was extracted from the container and glued onto a SiOz plate for X-ray investigation.

Under the action of ball milling, zinc oxide dust, acid solution and ceramic particles constantly collide and rub, so that new surfaces are continuously formed between zinc oxide dust and acid solution, which increases the chemical activity, so that the leaching rate of germanium is increased to 85.58 %.

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Germanium and Ball Milling. Science topic Germanium. A rare metal element with a blue-gray appearance and atomic symbol Ge, atomic number 32, and atomic weight 72.59.

Ball milling is a mechanical technique that is broadly used to grind powders into fine particles [134–141]. The reactants are generally broken apart using solvent molecules in …

A 20 mL ball-milling reactor was charged with 1 g of bulk α-germanium crystals (99.999%, purity), 30 stainless steel balls, and 1 mL of a mixture 2-propanol: H 2 O (4:1 v / v). The reactor was then stirred for 60 min at 3000 rpm. Then, the wet powder was dried under a vacuum for 24 h at 60 °C and stored under an Ar atmosphere.

Silicon–germanium (SiGe) alloys used in thermoelectric generators and for cooling have attracted widespread attention in recent decades. Si 80 Ge 20 B 4 alloys are prepared by the mechanical ball milling (BM) method and spark plasma sintering technique in this work. In order to improve the thermoelectric properties, we synthesized Mo@Si 80 …

Different established synthesis methods such as melt-casting followed by annealing as well as melt-spinning or ball-milling followed by hot-pressing or spark plasma sintering may significantly influence the properties of thermoelectric materials. ... Cobalt germanide precipitates indirectly improve the properties of thermoelectric germanium ...

Through a nanocomposite approach using ball milling and hot pressing, we have achieved a peak ZT of 0.8 at 700 °C, which is about 60% higher than the best reported 0.5 and might be good enough ...

The vials of ball mill and balls were made of tungsten carbide. The ball to powder ratio (BPR) was maintained to 15:1 and the milling speed was 300 rpm. The milling was conducted in wet (Toluene) medium. The milling cycle was 10 min milling and 20 min cooling. The powders handling were made inside the glove box in high purity …

1.. IntroductionMechanical alloying (MA), which is an alloy formation in the solid phase by means of repeated mechanical impact during high energy ball milling [1], has been proved to be an advantageous method for the synthesis of semiconducting thermoelectric compounds or solid solutions 2, 3, 4.The method even allows the …

A solid-state mechanochemical approach is executed to produce a new porous structure of nano germanium incorporated thin graphite nanoplatelets …

These fundamental results guide parameter choice for more complex freeform ball milling of optics for IR applications ranging from surveillance to medical imaging.

In this work, germanium nanoparticles have been fabricated by the technique of milling at low temperature (cryomilling) under an inert atmosphere that is relatively inexpensive and scalable. The common issue of contamination during conventional planetary ball milling can be overcome during cryomilling [23].

For comparison, the change of the crystalline lattice parameters in germanium due to crystal- to-amorphous phase transition induced by ball milling is equal to 0.2-0.4%. Therefore, the explanation of the amorphization by the mechanism A in germanium subjected to SPD is not supported by factual evidence.

Ball milling of magnesium hydride with germanium additives in argon for up to 10 h was shown to result in the formation of nanocomposites of α- and γ-modifications of MgH 2 together with individual Ge phase. When the as milled samples are heated-up, Ge interacts with MgH 2 to form Mg 2 Ge at T = 350–400 °C; the phase transformation …

On the other hand, the slow densification of ball-milled powders occurred at a lower temperature compared with gas-atomized powders. The suitable sintering temperature for sufficient densification was in the range between 1400 and 1450 K. Sinterability of gas-atomized Si–Ge powders was confirmedly improved with the …

The utility model discloses a germanium dioxide ball-milling ultrasonic wave generating device relates to the metal and prepares relevant equipment technical field. The utility model discloses a ball-milling machine body, the downside of ball-milling machine body is fixed with the external screw thread board, and the below of external screw thread board …

Commercial Si (Aladdin, micrometer-sized particles) and graphite powders (Aladdin, 750–850 mesh) were mixed in a weight ratio of 6:3, and 0.9 g of the mixture was ball milled in a stainless steel jar. The ball milling was carried out at a speed of 1200 rpm for different time (0, 0.5, 1, 5, and 10 h). 2.2. Characterization.

Abstract. Freeform germanium optics produced by single crystal diamond milling are important for infrared (IR) imaging applications. However the mechanics of interrupted cutting of germanium is not fully understood. This paper presents new findings from cutting experiments including: (1) uninterrupted orthogonal cutting and (2) …

Germanium phosphide, which combines the benefits of both germanium and phos-phorus, is considered a potential anode for lithium- and sodium-ion batteries. Currently, the main approaches to synthesizing nanosized germanium phosphide are limited to ball milling and separation of GeP particles. The ball milling leads to the …

germanium nanocrystals P K Giri Department of Physics and Centre for Nanotechnology, Indian Institute of Technology, ... Ball milling is a powerful technique for large-scale production of ...

Here we report on the synthesis of freestanding Ge nanoparticles (NPs) down to approximately 7 nm using ball milling technique and study its structural evolution as a …

Freeform germanium optics produced by single crystal diamond milling are important for infrared (IR) imaging applications. However the mechanics of interrupted cutting of germanium is not fully understood. This paper presents new findings from cutting experiments including: (1) uninterrupted orthogonal cutting and (2) interrupted flycutting …

Freestanding Ge NCs down to ~7 nm size are synthesized by using the ball milling technique and investigated regarding the nature of strain. Detailed analysis of …

The common issue of contamination during conventional planetary ball milling can be overcome during cryomilling [23]. Lower milling temperature (∼200 K) and the inert atmosphere (argon) maintained during milling helps in overcoming the problem due to poor stability of germanium in air [24]. This method also results in germanium …

Kumari, S., Singh, D., & Giri, P. K. (2009). Strain Anisotropy in Freestanding Germanium Nanoparticles Synthesized by Ball Milling. Journal of Nanoscience and ...

Germanium Phosphorus Sulfide (LGPS) sulfide type. LATP has the advantage that the price of raw materials and pro - ... ical ball-milling method, that includes blending, crushing, amorphization, and solid-state processes in high-energy grinding. This method o ffers a number of advantages,

Mechanical milling is a promising route for production of submicron and nano sized silicon powders, but it is challenging to predict and control the product properties. In this study a metallurgical grade silicon quality was milled in a planetary ball mill and the properties of the powder were investigated as a function of grinding time, …

Ball milling of magnesium hydride with germanium additives in argon for up to 10 h was shown to result in the formation of nanocomposites of α- and γ-modifications of MgH2 together with ...