Preparation of Y2Ti2O7 pyrochlore using high-energy ball milling and their structural, thermal and conducting properties

Mineralogical Studies of Coal Fly Ash for Soil Application in Agriculture

“…Samples were characterized using x-ray diffraction (XRD) to identify the formed phases (Singh et al 2012). The powdered sample of fly ash was pressed into the aluminum holder and subjected to Cu-K radiation between 10 C and 80 C. X-ray powder diffraction study was performed at room temperature using PAN analytical X'Pert PRO system with Ni-filter.…”

“…(DTA=TGA) Differential thermal analysis (DTA) was performed in nitrogen atmosphere using Perkin Elmer (Model: Diamond Pyris TG=DTA analyzer) to check thermal stability and phase transition (Singh et al 2012). Thermal gravimetric measurements of the samples were performed using Al 2 O 3 powder as reference material in nitrogen atmosphere at a heating rate of 10 C min À1 from 50 C to 900 C. The temperature and weight loss detection limit of the instrument are AE1 C and 0.001 mg, respectively.…”

“…The spectrum of each sample was normalized to the spectrum of blank potassium bromide (KBr) (Singh et al 2012). …”

Mechanical synthesis of nanostructured Y2Ti2O7 pyrochlore oxides

“…As a consequence, the reaction that normally requires high temperatures to facilitate the diffusion occurs at room temperature during mechanical milling and nanosized particles can be obtained [11]. Y 2 Ti 2 O 7 pyrochlore powders have recently been produced by a simple mechanosynthesis technique [12] [13] [14]. Moreno et al [12] showed that a milling of a stoichiometric mixture of Y 2 O 3 and TiO 2 powders for 19 h in a zirconia planetary ball mill leads to obtaining a single-phased powder.…”

“…Moreno et al [12] showed that a milling of a stoichiometric mixture of Y 2 O 3 and TiO 2 powders for 19 h in a zirconia planetary ball mill leads to obtaining a single-phased powder. Fuentes et al [13] and Singh et al [14] showed that the produced as-milled powders were composed by partially disordered phases, which are intermediate between the ordered pyrochlore and disordered fluorite structures. This partially disordered pyrochlore structure transforms into the ordered form around 800°C, mainly due to oxygen re-arrangements [13].…”