Skip to Main Content
 

Global Search Box

 
 
 

ETD Abstract Container

Abstract Header

Characterization of Morphological and Chemical Properties of Scandium Containing Cathode Materials

Mroz, Michael V.
http://orcid.org/0000-0001-6504-8003
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou158470102410177

Abstract Details

2020, Doctor of Philosophy (PhD), Ohio University, Physics and Astronomy (Arts and Sciences).
Understanding thermionic cathodes is crucial for the future development of communication technologies operating at the terahertz frequency. Model cathode systems were characterized using multiple experimental techniques. These included Low Energy Electron Microscopy, X-Ray Photoemission Spectroscopy, and Auger Electron Spectroscopy. This was done to determine the mechanisms by which tungsten, barium, scandium, and oxygen may combine in order to achieve high current densities via thermionic emission. Barium and scandium films are found to dewet from the tungsten surfaces studied, and not diffuse out from bulk sources. The dewetted droplets were found to contribute the most to thermal emission. Barium oxide and scandium oxide are also found to react desorb from the emitting surface at lower temperatures then the metals themselves. The function of scandium in scandate cathodes was determined to act as an inhibitor to oxide formation. These observations are not compatible with certain models of cathode operation, mainly the dipole and semi-conductor models.
Martin Kordesch (Advisor)
139 p.
Condensed Matter Physics; Experiments; High Temperature Physics; Materials Science; Physics
tungsten; scandium; electron microscopy; thermionic emission; synchrotron radiation; XPS; AES; dewetting

Recommended Citations

Citations

  • Mroz, M. V. (2020). Characterization of Morphological and Chemical Properties of Scandium Containing Cathode Materials [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou158470102410177

    APA Style (7th edition)

  • Mroz, Michael. Characterization of Morphological and Chemical Properties of Scandium Containing Cathode Materials. 2020. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou158470102410177.

    MLA Style (8th edition)

  • Mroz, Michael. "Characterization of Morphological and Chemical Properties of Scandium Containing Cathode Materials." Doctoral dissertation, Ohio University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou158470102410177

    Chicago Manual of Style (17th edition)

ohiou158470102410177
272
© 2020, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.