Journal of Inorganic Materials ›› 2018, Vol. 33 ›› Issue (9): 981-986.doi: 10.15541/jim20170539

• Orginal Article • Previous Articles     Next Articles

Floating Zone Growth and Thermionic Emission Property of [100], [110], [111] CeB6 Single Crystal

Yan WANG(), Jiu-Xing ZHANG, Xin-Yu YANG(), Jing-Jing ZHAO, Shu-Yu NING, Zhi LI   

  1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
  • Received:2017-11-13 Revised:2018-03-16 Online:2018-09-20 Published:2018-08-14
  • About author:WANG Yan. E-mail: 13855150682@163.com
  • Supported by:
    The Joint Foundation of Ministry of Education and Equipment Pre-research of China (JD2017XAZC0002)

Abstract:

High-quality CeB6 single crystal was successfully prepared by optical floating zone method combining spark plasma sintering. [100], [110], [111] CeB6 single crystals were obtained by X-ray Laue directional system equipped with precision cutting system. The structure and crystal quality of [100] CeB6 single crystal was given emphasis to analyze and characterize. The results show that [100] CeB6 single crystal exhibits good quality with the full width at half-maxmium (FWHM) of 0.24o. With the increase of the cathode temperature from 1773 K to 1973 K, the maxmium emission current density of [100], [110], [111] single crystal improved by 3.6, 4.2 and 2.5 times, respectively. [100] CeB6 single crystal possesses the best thermionic emission performance: the maxmium emission current density reaches 64.77 A·cm-2 at 1973 K and applied voltage of 4 kV, which is larger than that of reported values in the literature up to now, and the effective work function is 2.821 eV. Therefore, [100] CeB6 single crystal with excellent thermionic emission properties will have proming application prospects.

Key words: optical floating zone method, CeB6 single crystal, thermionic emission properties, [100] CeB6 single crystal

CLC Number: 

  • TQ174