An intermetallic compound c –NiZr and a mixture of elemental powders of nickel and zirconium [Ni 50 Zr 50 (at. %)] have been mechanically ground (MG) and mechanically alloyed (MA), respectively, using a high-energy ball mill in various atmospheres. The products were characterized by x-ray diffraction, transmission electron microscopy, differential scanning …
Amorphization by ball milling. A review A.W.Weeber H.Bakker https://doi/10.1016/0921-4526 (88)90038-5 Get rights and content Abstract A new method for the preparation of amorphous alloys is the mechanical alloying process. So far, three amorphization reaction types were observed when this technique is used.
nism of amorphization by MG of intermetallics is still not well understood. MA and MG are usually carried out using a high-energy ball mill in an inert gas atmo-sphere. Recently, the present authors have demonstrated that an amorphous nitride a-TiZrN0.3 is synthesized by MA and the chemical reaction between N2 and Ti
Structural changes occurring in the crystalline element selenium upon high-energy ball milling has been studied. Milling experiments have been performed at the ambient temperature and at a cryogenic temperature of -100 °C, respectively. The final milling products under both conditions were found to be a fully amorphous phase after several hours of mechanical milling.
The I 2-sorption and -retention properties of several existing zeolitic imidazolate frameworks (ZIF-4, -8, -69) and a novel framework, ZIF-mnIm ([Zn(mnIm) 2]; mnIm=4-methyl-5-nitroimidazolate), have been characterised using microanalysis, thermogravimetric analysis and X-ray diffraction.The topologically identical ZIF-8 ([Zn(mIm) 2]; mIm=2-methylimidazolate) and …
The purpose of this study was to investigate the effect of working volume in the high-energy ball-milling process on the breakage characteristics (i.e., particle size, morphology, and chemical composition) and adsorption performance of rice straw ash. This study was conducted to confirm working volume issue since this parameter has correlations with the …
12%To prepare the powder for the use of the kinetic spray, the amorphization and grain refinement of ZrO 2 powder in mechanical ball milling were studied. The results showed that the amorphization and grain refinement were improved because of the formation of solid solution when the CeO 2 agent was added.
The SHMM provides higher efficient and instant way of amorphization of rice starch compared to conventional methods as pressure treatment, ball milling treatment, and so on. In this study, the milling temperature and initial moisture content of the tapioca starch are varied, respectively, as 80 °C, 100 °C, and 120 °C and 10%, 12%, and 14% ...
A proposed microstructural mechanism is shown in fig. S6. Similar phenomenon has been observed in extreme deformation of brittle materials (23–27) and takes place during processes such as ball milling . The versatility and synergy of deformation mechanisms in HEAs render them as viable candidates for extreme load-bearing applications such as ...
alongside a 10 mm stainless steel milling ball at room temperature and sealed properly. This combination was then subjected to 30 Hz milling in a Retsch MM400 grinder mill for varying times. After milling, the amorphous milling products were recovered and characterized. SI-2: Ball-milling Amorphization
The rapid amorphization of the prototypical substituted zeolitic imidazolate framework, ZIF-8, by ball-milling is reported, which possesses a continuous random network topology with a higher density and a lower porosity than its crystalline counterpart. We report the rapid amorphization of the prototypical substituted zeolitic imidazolate framework, ZIF-8, by ball-milling.
X-ray diffraction has been used to investigate the kinetics of amorphization through ball-milling at 20 Hz, for five zeolitic imidazolate frameworks (ZIFs) – ZIF-8, ZIF-4, ZIF-zni, BIF-1-Li and CdIF-1. We find that the rates of amorphization for the zinc-containing ZIFs increase with increasing solvent acces In celebration of Tony Cheetham's 70th birthday Flexibility and Disorder in Metal ...
Amorphization by mechanical milling (MM), where a single composition (e.g. intermetallic compound) is milled requires the accumulation of defects to induce the transformation. It is concluded that anti-site chemical disorder and nanocrystalline grain boundaries are the important defects in this regard.
The purposes of this study were to clarify the amorphization by ball milling of atorvastatin calcium sesquihydrate (AT) and to analyse the change in dissolution kinetics. Methods The amorphous AT was prepared from crystal AT by ball milling and analysed in terms of the changes of its physicochemical properties by powder X-ray diffraction ...
The amorphization kinetics are revealed by X-ray diffractometry (XRD), high-resolution transmission electron microscopy (HRTEM), and electron energy loss spectroscopy (EELS). HRTEM investigations indicate that, in the early stage of milling, the thick sp 2 layers are sliced into many thinner sheets because of cleavage along the basal planes.
We report the rapid amorphization of the prototypical substituted zeolitic imidazolate framework, ZIF-8, by ball-milling. The resultant amorphous ZIF-8 (amZIF-8) possesses a continuous random network (CRN) topology with a higher density and a lower porosity than its crystalline counterpart. A decrease in the In celebration of Tony Cheetham's 70th birthday
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