Mekprasart, Wanichaya

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Mekprasart, Wanichaya
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MEKPRASART, Wanichaya
Mekprasart, W.
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wanichaya.me@kmitl.ac.th

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    Synthesis and characterization of cubic-like zinc stannate powders prepared by co-precipitation method
    (2016-01-01)
    Mekprasart, Wanichaya
    ;
    Tangcharoen, Thanit
    ;
    Nakhanivej, Puritat
    ;
    Pecharapa, Wisanu
    Spinel-type zinc stannate (Zn<inf>2</inf>SnO<inf>4</inf>) powders were synthesized by co-precipitation method using zinc chloride and tin chloride as the precursors for Zn and Sn sources, respectively. Co-precipitation process is one of effective techniques due to non-complex system, short process time, high yield, large scale production and cost-effectiveness comparing to other methods. The influence of calcination temperature in the range of 900 °C to 1100 °C on the structure, morphologies and cation distribution were studied using various characterization techniques. A single spinel structure phase formation after-calcined powders are confirmed by X-ray diffraction (XRD) results meanwhile scanning electron microscope (SEM) showed the appearance of cubic-like shape. The aggregation of particle and strong crystallinity was distinctly increased resulting to their greater size by the effect of high calcined temperature. Moreover, the non-equilibrium site occupancy of zinc (Zn<sup>2+</sup>) and tin (Sn<sup>4+</sup>) ions was investigated through Zn K-edge and Sn L3-edge investigated by X-ray absorption (XAS) spectra via the synchrotron radiation light source. Compared with the calcined temperature sample, XANES spectra revealed that the oxidation state of Zn was +2 and Sn valence was +4 in all spinel Zn<inf>2</inf>SnO<inf>4</inf> samples which well corresponds to the theoretical values.
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    Item type:Publication,
    Effect of Precursor Concentration on Physical Properties of Cube-Like Zn2SnO4 Powders Synthesized by Co-Precipitation Method
    (2015-09-02)
    Mekprasart, Wanichaya
    ;
    Nakhanivej, Puritat
    ;
    Tangcharoen, Thanit
    ;
    Pecharapa, Wisanu
    Cube-like Zinc stannate (Zn<inf>2</inf>SnO<inf>4</inf>) spinel powders were synthesized by co-precipitation method using chloride starting precursors of zinc and tin. The influence concentration of precursors on relevant physical properties of Zn<inf>2</inf>SnO<inf>4</inf> was investigated by increasing concentration of precursor material at 0.1 to 0.4 M (Zn:Sn at ratio 1:1). Structural properties of as-synthesized and Zn<inf>2</inf>SnO<inf>4</inf> crystal were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and X-ray absorption spectroscopy (XAS). The results indicate that as-prepared material without calcination process is in cubic symmetry of zinc hydroxy stannate (ZnSn(OH)6) affirmed by SEM and XRD results. Meanwhile, spinel phase of Zn<inf>2</inf>SnO<inf>4</inf> with strong crystalline and eminent cubic structure can be achieved after calcination at 1000°C. Homogenous dispersion, high crystallinity and good cubic structure of Zn<inf>2</inf>SnO<inf>4</inf> powders are occurred at higher concentration of precursors. Moreover, the oxidation state of these samples were investigated by the Zn K-edge and Sn L3-edge X-ray absorption near edge structure (XANES) using the synchrotron radiation light source. The analyses of XANES spectra revealed that the oxidation state of Zn was +2 and Sn valence was +4 in all Zn<inf>2</inf>SnO<inf>4</inf> samples, which well corresponds to the theoretical values. © 2015