Preparation and Properties of (Ce0.4La0.2Pr0.2Nd0.2)B6 Single‐Crystal by the Optical Float‐Zone Traveling Solvent Technique
Preparation and Properties of (Ce0.4La0.2Pr0.2Nd0.2)B6 Single‐Crystal by the Optical Float‐Zone Traveling Solvent Technique
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DOI：
10.1002/crat.201700159
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发表时间：
2017-11
影响因子：
1.5
通讯作者：
Panding Wang;Jiu-Xing Zhang;Xinyu Yang;S. Ning;Jingwen Zhang;Yan Wang;Zhi Li
中科院分区：
文献类型：
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作者：
Panding Wang;Jiu-Xing Zhang;Xinyu Yang;S. Ning;Jingwen Zhang;Yan Wang;Zhi Li
利用光学浮子带移动溶剂技术成功制备了高质量的（Ce0.4La0.2Pr0.2Nd0.2）B6单晶。采用X射线衍射仪、X射线单晶衍射仪、旋转靶X射线衍射仪、X射线劳埃衍射仪、扫描电子显微镜和热电子发射设备等对不同速率下得到的（Ce0.4La0.2Pr0.2Nd0.2）B6单晶的晶体结构和性能进行了表征。结果表明：生长的单晶组成均匀，晶格尺寸为4.143 Å，为立方结构。在生长速率V = 7 mm/h下制备的（Ce0.4La0.2Pr0.2Nd0.2）B6单晶具有最佳的机械和热离子发射性能。在4kv电压下，1873 K电流密度为53.3 A/cm2，维氏硬度为29.26 GPa，表明（Ce0.4La0.2Pr0.2Nd0.2）B6单晶是一种很有前途的热离子发射材料。
The high quality (Ce0.4La0.2Pr0.2Nd0.2)B6 single‐crystal has been successfully prepared by the optical float‐zone traveling solvent technique. The crystal structure and performance of the (Ce0.4La0.2Pr0.2Nd0.2)B6 single‐crystal obtained at different rates are characterized by using XRD, X‐ray single‐crystal diffraction, rotating target X‐ray Diffractometer, X‐ray Laue diffraction, SEM and thermionic emission equipment etc.. The results show that the as‐grown single‐crystal with the uniform composition has a cubic structure with the lattice size of 4.143 Å. The optimal mechanical and thermionic emission properties belong to the (Ce0.4La0.2Pr0.2Nd0.2)B6 single‐crystal prepared at growth rate V = 7 mm/h. The values of 53.3 A/cm2 in the current density at 1873 K under the applied voltage of 4 kV and 29.26 GPa in Vickers hardness indicate that (Ce0.4La0.2Pr0.2Nd0.2)B6 single‐crystal is a promisingly thermionic emission material.