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Synthesis of Monodispersed Fine Hafnium Diboride Powders Using Carbo/Borothermal Reduction of Hafnium Dioxide

Authors

  • De-Wei Ni,

    1. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Shanghai 200050, China
    2. Graduate School of the Chinese Academy of Sciences, Beijing 200049, China
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  • Guo-Jun Zhang,

    Corresponding author
    1. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Shanghai 200050, China
      †Author to whom correspondence should be addressed. e-mail: gjzhang@mail.sic.ac.cn
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    • *Member, The American Ceramic Society.

  • Yan-Mei Kan,

    1. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Shanghai 200050, China
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  • Pei-Ling Wang

    1. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Shanghai 200050, China
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  • T. Parthasarathy—contributing editor

  • This work was financially supported by the Chinese Academy of Sciences under the Program for Recruiting Outstanding Overseas Chinese (Hundred Talents Program), the National Natural Science Foundation of China (no. 50632070 and no. 50602048)ed.

†Author to whom correspondence should be addressed. e-mail: gjzhang@mail.sic.ac.cn

Abstract

Fine hafnium diboride (HfB2) powders have been prepared by modified carbothermal/borothermal reduction of hafnium dioxide (HfO2) at relatively low temperatures (1500°–1600°C) for 1–2 h. The XRD patterns could be indexed as hexagonal HfB2 and no evidence of HfC, HfO2, or other impurities was observed. Glow discharge mass spectrometer analysis indicates that the synthesized HfB2 powders had high purity. The synthesized HfB2 powders had small average crystallite size (around 1 μm) and low oxygen content (<0.30 wt%). Scanning electron microscopy observation of the as-prepared powders demonstrated quasi-column morphology and laser particle size analysis showed monodispersity (polydispersity 0.005).

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