A thermionic energy converter with a molybdenum-alumina cermet emitter
A thermionic energy converter with a molybdenum-alumina cermet emitter
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具有钼铝金属陶瓷发射器的热离子能量转换器
DOI：
10.1063/1.346960
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发表时间：
1990
影响因子：
3.2
通讯作者：
R. Metselaar
中科院分区：
文献类型：
--
作者：
G. Gubbels;Lr Lodewijk Wolff;R. Metselaar
本文研究了金属陶瓷作为超声换能器电极材料的性能。由于热力学原因，预期由纯Mo和难熔氧化物组成的所有金属陶瓷具有相同的裸功函数。根据Mo在氧气氛中的功函数数据，该裸功函数估计为Φ=4.9 eV（T=1400 °C）。实验上，Al 2 O3-Mo金属陶瓷的裸功函数被发现为Φ=4.5 eV，与Al 2 O3和Mo的相对量无关。发现Al 2 O3-Mo金属陶瓷的铯化功函数比纯Mo的铯化功函数低0.15 eV。Mo_3Al的裸功函数为Φ= 4.0eV。在收集极温度条件下，Mo 3Al的铯化功函数比纯Mo的铯化功函数低0.3eV。具有Al 2 O3-Mo金属陶瓷发射体的二极管的电功率密度在1300 °C下为0.4 W/cm 2。在此温度下的势垒指数为2.36 V。高势垒指数归因于高等离子体…
A study is made of the properties of cermets as electrode materials for thermionic energy converters. For thermodynamic reasons it is expected that all cermets composed of pure Mo and refractory oxides have the same bare work function. From data on the work function of Mo in an oxygen atmosphere this bare work function is estimated to be Φ=4.9 eV (at T=1400 °C). Experimentally, the bare work function of Al2O3‐Mo cermets was found to be Φ=4.5 eV, independent of the relative amounts of Al2O3 and Mo. The cesiated work function of the Al2O3‐Mo cermets was found to be 0.15 eV lower than the cesiated work function of pure Mo. The bare work function of Mo3Al was found to be Φ=4.0 eV. The cesiated work function of Mo3Al at collector temperature conditions was 0.3 eV lower than the cesiated work function of pure Mo. The electrical power density of a diode with an Al2O3‐Mo cermet emitter was 0.4 W/cm2 at 1300 °C. The barrier index at this temperature was 2.36 V. The high barrier index is attributed to a high plasma...