Optical absorption and thermionic emission mechanism of multi-functional La1–x Srx B6 hexaborides

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Abstract

The optical absorption property of the nanocrystalline La _1–xSr _xB ₆powder and thermionic emission property of the La _1–xSr _xB ₆polycrystalline bulk are investigated. As a result, the transmission wavelength of LaB ₆is red-shifted from 591 nm to 658 nm with the increase of Sr doping content. The emission tests indicate that the thermionic emission current density of La _1–xSr _xB ₆polycrystalline bulk increases from 2.3 A/cm ²to 19.36 A/cm ²with the increase of La doping content under an applied voltage of 2000 V. The first-principle calculation results reveal that Sr doping LaB ₆leads plasma frequency energy and Fermi level to decrease, resulting in the tunable characteristics of transmission wavelength and enhancement of thermionic emission. Therefore, the Sr-doped LaB ₆as a multifunctional ceramic has a potential application in the field of optical filter or becomes a promising cathode for microwave device.

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Corresponding author:Bao Li-Hong,baolihong@imnu.edu.cn

Funds:Project supported by the Natural Science Foundation of Inner Mongolia Autonomous Region, China (Grant No. 2019LH05001) and the National Natural Science Foundation of China (Grant No. 51662034).

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Compound	零场发射电流密度(J₀)		有效逸出功 φ_e/ eV
Compound	1673 K	1773 K	有效逸出功 φ_e/ eV
SrB₆	0.97	1.79	2.845
La_0.2Sr_0.8B₆	1.67	4.73	2.691
La_0.4Sr_0.6B₆	3.5	8.7	2.585
La_0.6Sr_0.4B₆	4.1	8.3	2.573
La_0.8Sr_0.2B₆	5.39	10	2.552

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Vol. 70, Issue 21 - 2021-11-05

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