Thermionic Emission from a Niobium Single Crystal

1974 ◽  
Vol 52 (17) ◽  
pp. 1589-1593 ◽  
Author(s):  
R. P. Leblanc ◽  
B. C. Vanbrugghe ◽  
F. E. Girouard
Keyword(s):  
Single Crystal ◽  
Work Function ◽  
Surface Structure ◽  
Whisker Growth ◽  
Crystal Surface ◽  
Thermionic Emission ◽  
Etch Pits ◽  
Spherical Projection

A spherical projection diode was used to determine the Richardson constants from a niobium spherical single crystal. Work function and AR values are reported for the [110], [111], [112], [113], [116], [001], and [310] crystallographic directions. Examination of the crystal surface revealed plateau-like surface structure, thermal etch pits, and whisker growth.

Thermionic work function of low index planes of rhenium

1980 ◽  
Vol 58 (1) ◽  
pp. 43-47 ◽  
Author(s):  
J. Robichaud ◽  
F. E. Girouard
Keyword(s):  
Single Crystal ◽  
Work Function ◽  
Crystal Surface ◽  
Thermionic Emission

The thermionic emission constants of a rhenium spherical single crystal have been determined for the [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] orientations. Examination of the crystal surface revealed plateau-like structure in the [0001], [Formula: see text], [Formula: see text], and [Formula: see text] directions.

Thermionic Emission of Yttrium Dodecaboride Single Crystal

2019 ◽  
Vol 289 ◽  
pp. 47-52 ◽  
Author(s):  
Daniil Voronovych ◽  
Anatoliy Taran ◽  
Oksana Podshyvalova ◽  
Natalya Shitsevalova ◽  
Volodymyr Filipov ◽  
...  
Keyword(s):  
Single Crystal ◽  
Work Function ◽  
Current Density ◽  
Crystal Surface ◽  
High Vacuum ◽  
Electron Work Function ◽  
Linear Functions ◽  
Zero Field ◽  
Effective Electron ◽  
Temperature Dependences

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.

The mechanism of Li2O2-film formation and reoxidation – Influence of electrode roughness and single crystal surface structure

2020 ◽  
Vol 875 ◽  
pp. 114560
Author(s):  
Andreas Koellisch-Mirbach ◽  
Tabea Lohrmann ◽  
Philip Heinrich Reinsberg ◽  
Helmut Baltruschat
Keyword(s):  
Single Crystal ◽  
Surface Structure ◽  
Crystal Surface ◽  
Film Formation ◽  
Single Crystal Surface
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