Thermionic Emission of Yttrium Dodecaboride Single Crystal
| Autor: | Oksana Podshyvalova, Anatoliy Taran, V. B. Filipov, Daniil Voronovych, Natalya Shitsevalova, Anatoliy V. Dukhnenko |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science business.industry chemistry.chemical_element Thermionic emission 02 engineering and technology Yttrium 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics chemistry 0103 physical sciences Optoelectronics General Materials Science 0210 nano-technology business Single crystal |
| Zdroj: | Solid State Phenomena. 289:47-52 |
| ISSN: | 1662-9779 |
| DOI: | 10.4028/www.scientific.net/ssp.289.47 |
| Popis: | Experimental data on thermionic current density and electron work function of YB12 (100) at T = 1218 – 1978 K in high vacuum (p < 10-4 Pa) are first introduced. Temperature dependences of the thermionic current density and effective electron work function are presented without extrapolation to the zero-field currents because of the anomalous Schottky effect. The temperature dependences of theYB12 electron work function can be described by linear functions at certain temperature intervals. Preferential boron evaporation and additional ion bombardment by the residual gases ions and evaporated boron ions results in appearance of new phases depleted of boron on the YB12 surface. As a result, an YB4 – YB6 double layer on the YB12 single crystal surface has formed. The appearance of the new boride phases, depleted of boron, on the emitting surface causes an increase of thermionic current density compared with individual YB12. |
| Databáze: | OpenAIRE |
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