| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Floating Zone Growth and Thermionic Emission Property of Single Crystal CeB6 |
| BAO Li-Hong1, ZHANG Jiu-Xing1**, ZHOU Shen-Lin1, ZHANG Ning1, XU Hong2
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1Key Laboratory of Advanced Functional Materials (Ministry of Education), College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124
2Institute of Laser Engineering, Beijing University of Technology, Beijing 100124
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| Cite this article: |
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BAO Li-Hong, ZHANG Jiu-Xing, ZHOU Shen-Lin et al 2011 Chin. Phys. Lett. 28 088101 |
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Abstract Large-sized and high-quality cerium hexaboride (CeB6) single crystals are successfully grown by the optical floating zone method. The structure, chemical composition and thermionic emission properties of the crystal are characterized by x−ray diffraction, x-ray fluorescence and emission measurements, respectively. Based on the observation of single crystal diffraction, the relative density of feed rods has a great effect on the quality of the grown crystal. The thermionic emission measurement results show that the emission current density of the single crystal is 47.1 A/cm2 at 1873 K with an applied voltage of 1 kV, which is about two times larger than the value for polycrystalline samples. The single crystal possesses excellent emission current stability. Therefore, it is expected that CeB6 single crystal is a very promising material for thermionic cathode applications.
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| Keywords:
81.10.-h
79.40.+z
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Received: 24 January 2011
Published: 28 July 2011
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| PACS: |
81.10.-h
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(Methods of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)
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79.40.+z
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(Thermionic emission)
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