فهرس المقالات High energy ball milling

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  1 - Electrical conduction in nanoceramic PGT synthesised by high energy ball milling
  SKS Parashar Satyendra Narayan Singh Mahmood Ghoranneviss Swarat Chaudhuri
  10.1186/2251-7235-7-26
  AbstractNanocrystalline Pb1–3x/2GdxTiO3 (where x = 0.01) abbreviated as PGT has been synthesised by high energy ball milling at room temperature. X-ray analysis shows that single-phase tetragonal structure of nanocrystalline PGT was formed after 15-h milling. The averag أکثر

  AbstractNanocrystalline Pb1–3x/2GdxTiO3 (where x = 0.01) abbreviated as PGT has been synthesised by high energy ball milling at room temperature. X-ray analysis shows that single-phase tetragonal structure of nanocrystalline PGT was formed after 15-h milling. The average crystallite size was found to be 17 nm. The frequency-dependent AC conductivity of the PGT ceramic was studied in the range 100°C to 525°C. Complex impedance analysis suggested the dielectric relaxation to be of non-Debye type. The activation energy was found to be 1.04 ev. The mechanism of charge transport in nanocrystalline PGT was successfully explained by correlated hopping model. تفاصيل المقالة
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  2 - Synthesis of (Tix,W1-x)3SiC2 MAX phase by mechanical milling
  Ali Bashirisafa Akbar Heidarpour Samad Ghasemi
  This study has investigated the synthesis of (Ti1-xWx)3SiC2 MAX phase via high energy ball milling, and the effect of heat treatment and excess Si on the purity of synthesized powder were explored. In this regards, different mixtures of Ti, Si, and C were ball milled by أکثر

  This study has investigated the synthesis of (Ti1-xWx)3SiC2 MAX phase via high energy ball milling, and the effect of heat treatment and excess Si on the purity of synthesized powder were explored. In this regards, different mixtures of Ti, Si, and C were ball milled by a planetary ball mill for various milling times up to 15h. The phase evolution of products was studied by X-ray diffraction (XRD), and the morphological changes monitored by a field emission scanning electron microscopy (FESEM) equipped with energy-dispersive spectroscopy (EDS). The results showed that after 15 hours of ball milling the reaction started, and resulted in Ti3SiC2 and TiC formation. The as-synthesized powders were then compacted and heat treated at 600, 1000, 1250 and 1400˚C. Heat treatment caused to proceed in the reaction between the intermetallic compounds in Si-Ti system and TiC, and led to increasing the purity of Ti3SiC2. In a separate run, a non-stoichiometric composition of Ti: Si:C= 3:1.2:2 was ball milled for 15 h, and heat treated at 1250˚C. The XRD results showed that the purity of the product is higher than the stoichiometric composition. The addition of W to Ti3SiC2 was also explored. In this regard, the synthesis of (Ti1-xWx)3SiC2 component (x= 0.8, 0.5) was investigated, and the results showed that some W incorporated in Ti3SiC2 structure, and the WC and TixW1-x formed during the process. تفاصيل المقالة