Floating Zone Growth and Thermionic Emission Property of Single Crystal CeB6
BAO Li-Hong1, ZHANG Jiu-Xing1**, ZHOU Shen-Lin1, ZHANG Ning1, XU Hong2
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
Floating Zone Growth and Thermionic Emission Property of Single Crystal CeB6
BAO Li-Hong1, ZHANG Jiu-Xing1**, ZHOU Shen-Lin1, ZHANG Ning1, XU Hong2
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
摘要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.
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.
BAO Li-Hong;ZHANG Jiu-Xing**;ZHOU Shen-Lin;ZHANG Ning;XU Hong
. Floating Zone Growth and Thermionic Emission Property of Single Crystal CeB6[J]. 中国物理快报, 2011, 28(8): 88101-088101.
BAO Li-Hong, ZHANG Jiu-Xing**, ZHOU Shen-Lin, ZHANG Ning, XU Hong
. Floating Zone Growth and Thermionic Emission Property of Single Crystal CeB6. Chin. Phys. Lett., 2011, 28(8): 88101-088101.
[1] Swanson L W and McNeely D R 1979 Surf. Sci. 83 11
[2] Takeda M et al 2004 J. Solid State Chem. 177 471
[3] Zhou S L et al 2009 J. Inorg. Mater. 24 793
[4] Zhang H et al 2005 J. Am. Chem. Soc. 127 2862
[5] Zou C Y, Zhao Y M and Jun Q X 2006 J. Cryst. Growth 291 112
[6] Dattatray J et al 2007 Ultramicroscopy 107 825
[7] Craciun V and Craciun D 2005 Appl. Surf. Sci. 247 384
[8] Wang X J et al 2009 J. Phys. D: Appl. Phys. 42 055409
[9] Qi K C et al 2008 Appl. Phys. Lett. 93 093503
[10] Nakamoto M and Fukuda K 2002 Appl. Surf. Sci. 202 289
[11] Balakrishnan G et al 2003 J. Cryst. Growth 256 206
[12] Paul R et al 1989 Appl. Surf. Sci. 37 381
[13] Futamoto M, Nakazawa M and Kawabe U 1980 Surf. Sci. 100 470
[14] Wang S et al 2010 J. Cryst. Growth 313 51
[15] Souptela D et al 2002 J. Cryst. Growth 244 296
[16] Otani S et al 2000 J. Solid. State. Chem. 154 238
[17] Otani S and Ishizawa Y 1996 J. Alloys Compd. 245 L18
[18] Zhao L et al 2010 Chin. Phys. Lett 27 087401
[19] Gesley M and Swanson L W 1984 Surf. Sci. 146 589
[20] Bao L H et al 2010 Chin. Phys. Lett 27 107901
[21] Uijttewaal M A, De Wijs G A and Groot R A 2006 J. Phys. Chem. B 110 18462
[22] Zhou S L, Zhang J X and Liu D M 2010 High Power Laser and Particle Beams 22 171
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