Floating Zone Growth and Thermionic Emission Property of Single Crystal CeB6

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2011,（8）
• 页码范围: 318-321
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/0256-307X/28/8/088101

摘要

Large-sized and high-quality cerium hexaboride(CeB6) single crystals are successfully grown yb 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 1873K 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 CeBs single crystal is a very promising material for thermionic cathode applications.