The Emission and Electrophysical Features of an Yttria-Coated Iridium Cathode
The Emission and Electrophysical Features of an Yttria-Coated Iridium Cathode
复制标题
氧化钇涂层铱阴极的发射和电物理特性
DOI：
10.1134/s0020441219040109
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发表时间：
2019
影响因子：
0.6
通讯作者：
N. Gall’
中科院分区：
文献类型：
--
作者：
E. Rut'kov;N. Gall’
摘要 开发了一种用于制造完全或局部涂覆氧化钇的铱钇阴极的实验室技术。提出了一种确定铱表面发射率的技术，并确定其值：在波长 665 nm 处为 0.6。确定了这种薄膜阴极的功函数：eφ = 3.4 eV。建立了中真空条件下阴极操作的温度范围，并表明该操作仅在 ≥ 1600 K 时有效。提出了描述该过程的物理模型。显示了氧化钇基阴极的高热稳定性，可以承受 2500 K 的加热数小时而不会退化。
AbstractA laboratory technology for manufacturing iridium–yttrium cathodes, which are totally or locally coated with yttria, was developed. A technique for determining the emissivity on the iridium surface was proposed and its value was determined: 0.6 at a wavelength of 665 nm. The work function of such film cathodes was determined:eφ = 3.4 eV. The temperature range of the cathode operation under the conditions of a medium vacuum was established, and it was shown that this operation is efficient only forТ≥ 1600 K. A physical model for describing this process is proposed. The high thermal stability of yttria-based cathodes, which can withstand heating atТ= 2500 K for hours without degradation, is shown.