Synthesis of Prismatic Single Crystal γ-MnOOH

doi:10.3724/SP.J.1077.2007.00667

Abstract

Abstract: Prismatic single crystal γ-MnOOH was synthesized by a hydrothermal method through oxidizing Mn(CH₃COO₂ with HMnO₄ at 150℃. The advantage of oxidizing agent HMnO₄ is that no other metallic ions coming into the product structures. The synthesized samples were characterized by XRD, SEM, TEM, HRTEM and TG. It is found that the formation process of single crystal γ-MnOOH includes two primary evolution stages: (1) the γ-MnOOH whiskers are initially formed, and (2) the whiskers grow to prismatic single crystal γ-MnOOH by an adsorption-growth process, (111) plane grows faster than other planes, because the surface energy of each crystal plane is different, the different growth rate makes the whiskers changed to prismatic crystal. The hydrothermal reaction time is the major factor that influences crystal morphology. TG results show that the single crystal γ-MnOOH is transferred to MnO₂ at 350℃.

Key words: hydrothermal method, γ-MnOOH, prismatic single crystal

CLC Number:

TB383

WANG Li,YUAN Zhong-Zhi,CHEN Qiu-Hong,SUN Feng,ZHU Li-Cai. Synthesis of Prismatic Single Crystal γ-MnOOH[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2007.00667.

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