JOURNAL ARTICLE

Enhanced thermionic electron emission of (La1‐x‐yPrxBay)B6 cathode transforming from the grain boundary to the grain.

  • Published In: Journal of the American Ceramic Society, 2025, v. 108, n. 5. P. 1 1 of 3

  • Database: Academic Search Ultimate 2 of 3

  • Authored By: Yang, Xinyu; Song, Yulin; Li, Zimeng; Cai, Biao; Dong, Cunchao; Deng, Chenhui; Wang, Yan; Zhang, Jianing; Xiang, Wenpeng; Zhang, Jiuxing 3 of 3

Abstract

The mixed rare earth/alkali earth was initially employed to enhance the thermionic emission performance of lanthanum hexaboride (LaB6) through forming the high‐dense (La1‐x‐yPrxBay)B6 polycrystal by spark plasma sintering (SPS). La0.6Pr0.3Ba0.1B6 exhibits the highest current density in space charge limited (SCL) region at T = 1873K while La0.5Ba0.5B6 has the highest current density in temperature limited (TL) region. The maximum current density of 14.07 A/cm2 at T = 1673K for La0.5Ba0.5B6 is higher than that of 11.71 A/cm2 at T = 1873K for LaB6 polycrystal, presenting superior emission characteristics at the low temperature, mainly ascribed to the contribution of the Ba element. With the increase in the Ba content, the location of the highest electron emission shifts from the grain boundary (in La0.5Pr0.5B6 and La0.6Pr0.3Ba0.1B6) to the internal grain (in La0.6Pr0.1Ba0.3B6 and La0.5Ba0.5B6). The consumption rate of the elements during thermionic emission follows the order: Ba > Pr > La. The experimental data on the current density aligns closely with the theoretical predictions, demonstrating the emission of (La1‐x‐yPrxBay)B6 ceramic obeys classical thermionic emission mechanism of metals. [ABSTRACT FROM AUTHOR]

Additional Information

  • Source:Journal of the American Ceramic Society. 2025/05, Vol. 108, Issue 5, p1
  • Document Type:Article
  • Subject Area:Physics
  • Publication Date:2025
  • ISSN:0002-7820
  • DOI:10.1111/jace.20373
  • Accession Number:183980730
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