Floating Zone Growth and Thermionic Emission Property of Single Crystal CeB6

被引：24

作者：

Bao Li-Hong ^{[1
]}

Zhang Jiu-Xing ^{[1
]}

Zhou Shen-Lin ^{[1
]}

Zhang Ning ^{[1
]}

Xu Hong ^{[2
]}

机构：

[1] Beijing Univ Technol, Coll Mat Sci & Engn, Minist Educ, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China

[2] Beijing Univ Technol, Inst Laser Engn, Beijing 100124, Peoples R China

来源：

CHINESE PHYSICS LETTERS | 2011年 / 28卷 / 08期

基金：

中国国家自然科学基金;

关键词：

LAB6;

D O I：

10.1088/0256-307X/28/8/088101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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/cm(2) 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.

引用

页数：4