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Fabrication and characterization of high density LaB6 polycrystalline with (100) preferred orientation

具有(100)择优取向的高致密LaB6多晶材料的制备与表征

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Abstract

High density lanthanum hexaboride (LaB6) polycrystalline with (100) preferred orientation was prepared by spark plasma sintering (SPS) using LaB6 nanocubes as raw materials in this work. Microstructure and thermionic electron emission property of LaB6 polycrystalline were investigated detailedly. The results show that the LaB6 polycrystalline had a relative density of 95.8%, and there was a (100) preferred orientation on its surface normal to SPS pressing direction. The work function of LaB6 polycrystalline normal surface was only 2.73 eV, which was almost close to the theoretical work function of LaB6 (100) single crystal surface. The reasons for preferential orientation of LaB6 polycrystalline were analyzed.

摘要

本文以六硼化镧(LaB6)纳米立方体粉体为原料, 经放电等离子烧结(SPS)制备了具有(100)择优取 向的高致密LaB6多晶材料. 详细研究了LaB6多晶材料的微观组织结构和热电子发射性能, 结果表明 LaB6多晶材料的相对密度高达95.8%, 而且在垂直于SPS烧结压力方向上的表面形成了(100)择优取向. 具有择优取向的LaB6多晶材料表面的电子逸出功仅为2.73 eV, 与LaB6单晶材料(100)晶面的理论电子 逸出功接近. 分析了LaB6多晶材料具有择优取向的原因.

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Authors and Affiliations

  1. Science and Technology on Advanced Ceramic Fibers and Composite Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, China

    Yi-ping Yu  (余艺平), Song Wang  (王松) & Wei Li  (李伟)

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  1. Yi-ping Yu  (余艺平)
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  2. Song Wang  (王松)
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  3. Wei Li  (李伟)
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Correspondence to Yi-ping Yu  (余艺平).

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Foundation item

Project(51902342) supported by the National Natural Science Foundation of China

Contributors

YU Yi-ping did the experiments and wrote the first draft of manuscript. WANG Song and LI Wei analyzed the data and edited the draft manuscript. All authors replied to reviewers’ comments and revised the final version.

Conflict of interest

YU Yi-ping, WANG Song, and LI Wei declare that they have no conflict of interest.

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Yu, Yp., Wang, S. & Li, W. Fabrication and characterization of high density LaB6 polycrystalline with (100) preferred orientation. J. Cent. South Univ. 29, 1118–1123 (2022). https://doi.org/10.1007/s11771-022-4983-z

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  • DOI: https://doi.org/10.1007/s11771-022-4983-z

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