Authors: Zhi Jun Xu, Rui Qing Chu, S.C. Cui, Jin Son Zhang
Abstract: Mixed-conducting ceramic oxide SrFeCo0.5Oy powders were prepared by a citrate method, and
the contributing factors to the formation of homogeneous fine powder with a pure perovskite-type
structure were ascertained. The resulting powder is pure, homogeneous and possesses a reasonably fine
particle size. Attempts were made to understand the synthesis process and it was confirmed that the
method produces powder had greater composition uniformity, lower residual carbonate levels and smaller
particle sizes.
971
Authors: Jing Pei, Zhen Xing Yue, Fei Zhao, Zhi Lun Gui, Long Tu Li
Abstract: The nano-sized Ba(Zr0.2Ti0.8)O3 powder was prepared by citrate sol-gel method. The crystal
structure and the particle size of the powder were characterized by XRD. The morphology of calcined
powder and the sintered ceramics was observed by TEM and SEM, respectively. The particle size of the
powders calcined at 600oC is about 10 nm. The dense ceramics can be obtained at sintering temperature of
1220 oC, which is much lower than that of the powder prepared by the conventional solid method. The
effects of Al2O3 additive on the sintering behavior, microstructure and dielectric properties of
Ba(Zr0.2Ti0.8)O3 ceramics were also investigated.
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Authors: Sheng Lin Liu, Xiu Juan Zhao, Rui Ming Ren
Abstract: Li4Ti5O12 spinel-type anode materials were synthesized by high-energy ball milling and solid-state method using TiO2 (Anatase) and Li2CO3 as starting materials. The powders were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), thermo-gravimetric (TG)/differential scanning calorimetric (DSC). The results showed that Li4Ti5O12 in a single phase can be fabricated above 750 °C for 3h when the mixture powders were high-energy ball milled at 500r/m for 30min. The grain size was 0.3-0.5 m and particle size distribution was narrow.
369
Authors: Gunawan, I. Sopyan, A. Naqshbandi, S. Ramesh
Abstract: Biphasic calcium phosphate powders doped with zinc (Zn-doped BCP) were synthesized via sol-gel technique. Different concentrations of Zn have been successfully incorporated into biphasic calcium (BCP) phases namely: 1%, 2%, 3%, 5%, 7%, 10% and 15%. The synthesized powders were calcined at temperatures of 700-900°C. The calcined Zn-doped BCP powders were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential and thermogravimetric analysis (TG/DTA) and field-emission scanning electron microscopy (FESEM). X-ray diffraction analysis revealed that the phases present in Zn-doped are hydroxyapatite, β- TCP and parascholzite. Moreover, FTIR analysis of the synthesized powders depicted that the bands of HPO4 increased meanwhile O-H decreased with an increase in the calcination temperature. Field emission scanning electron microscopy (FESEM) results showed the agglomeration of particles into microscale aggregates with size of the agglomerates tending to increase with an increase in the dopant concentration.
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