Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (12): 3365-3368.doi: 10.3866/PKU.WHXB20101205

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

Synthesis of Mn2O3 with a Hollow Olive Shape and Its Morphology Evolution

LI Ying-Pin, HAO Yan-Zhong   

  1. College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, P. R. China
  • Received:2010-06-18 Revised:2010-09-13 Published:2010-12-01
  • Contact: LI Ying-Pin E-mail:liyingpin@126.com
  • Supported by:

    The project was supported by the Doctoral Starting up Foundation of Hebei University of Science and Technology, China (QD200959), Provincial Natural Science Foundation of Hebei, China (B2010000856), and National Natural Science Foundation of China (20573031).

Abstract:

Permanganic potassium was reduced by malic acid under hydrothermal conditions without a template or additives and olive-shaped MnCO3 particles were obtained. After the MnCO3 precursor was calcined at 600 °C for 3 h, Mn2O3 was obtained and the olive-shape morphology was maintained. The products were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and thermogravimetry-differential thermal analysis (TG-DTA). The effect of hydrothermal reaction time on the morphology of the products was studied. A MnCO3 precursor with hollow olive morphology and thick wall was obtained when the reaction time was 2 h. When the reaction time was increased to 6 h, the wall of the hollow olive-shaped particles became thinner. When the reaction time was increased to 24 h the wall thickness of the MnCO3 precursor with the hollow olive morphology was about 30 nm. Because of the Ostwald-Ripening effect, the morphology of the MnCO3 precursor gradually evolved from thick-wall hollow olive to thin-wall hollow olive by increasing the reaction time.

Key words: Hydrothermal synthesis, Mn2O3, Hollow, Olive

MSC2000: 

  • O648