High-quality LaxCeyPr1-x-yB6 single crystal with excellent thermionic emission properties grown by optical floating zone melting method
High-quality LaxCeyPr1-x-yB6 single crystal with excellent thermionic emission properties grown by optical floating zone melting method
复制标题
采用光学浮区熔法生长出具有优异热电子发射性能的高质量LaxCeyPr1-x-yB6单晶
DOI：
10.1016/j.jallcom.2018.08.046
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发表时间：
2018
影响因子：
6.2
通讯作者：
Li Zhi
中科院分区：
文献类型：
--
作者：
Wang Yan;Zhang Jiuxing;Yang Xinyu;Zhu Zhongwen;Zhao Jingjing;Xu Bin;Li Zhi
采用光学浮区熔法首次生长出高质量的LaxCeyPr_（1-x-yB_6）（x = 0.6-0.8，y = 0.1-0.3）单晶。用X射线单晶衍射仪、扫描电镜、X射线衍射仪、X射线劳厄衍射仪等对所生长的单晶体的晶体结构、力学性能和电子发射性能进行了表征。获得了无亚晶界的[100] LaxCeyPr 1-x-yB 6单晶，晶体完整性好，元素分布均匀。LaxCeyPr_（1-x-yB_（6））单晶的晶格常数比LaB_（6）单晶的晶格常数低。La_（0.6）Ce_（0.3）Pr_（0.1）B_6单晶的半高宽最低，为162.0 arcsec。La0.6Ce0.3Pr0.1B6单晶的最高电子发射电流密度为105.10 A/cm 2，最低功函数为2.562 eV，表明该材料是一种很有前途的电子阴极材料。
The high-quality LaxCeyPr1-x-yB6(x = 0.6–0.8, y = 0.1–0.3) single crystals have been firstly grown by optical floating zone melting method. The crystal structure, mechanical and thermionic emission properties of the as-grown single crystals were characterized by X-ray single crystal diffractometer, SEM, XRD, X-ray Laue diffraction. Subgrain-boundary-free [100] LaxCeyPr1-x-yB6single crystal with a good crystalline integrity and homogeneous element distribution is obtained. The Lattice constant of LaxCeyPr1-x-yB6single crystal is lower than that of the LaB6single crystal. The lowest FWHM of 162.0 arcsec belongs to the La0.6Ce0.3Pr0.1B6single crystal. The highest thermionic emission current density of 105.10 A/cm2and the lowest work function of 2.562 eV indicate that La0.6Ce0.3Pr0.1B6single crystal is a very promising thermionic cathode material.