- Title
- Structural and thermionic emission investigations of perovskite BaHfO3 based low work function emitters
- Creator
- Hasan, Muhammad M.; Kisi, Erich; Sugo, Heber
- Relation
- Materials Science and Engineering: B Vol. 296, Issue October 2023, no. 116679
- Publisher Link
- http://dx.doi.org/10.1016/j.mseb.2023.116679
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2023
- Description
- Low work function materials are attracting researchers worldwide as potential thermionic emitters or collectors. In this study, a number of composite cathodes using a promising perovskite, barium hafnate (BaHfO3) with tungsten (W), lanthanum hexaboride (LaB6) and gadolinium hexaboride (GdB6) were investigated for thermionic properties. A series of cylindrical pellets using W-BaHfO3 and BaHfO3-hexaborides were milled, pressed, and then sintered at 1600 ◦C for 4 h. The structural, morphological, chemical, and thermionic properties of the synthesised emitters were studied using X-ray diffraction (XRD), scanning electron microscope (SEM), electron dispersive spectroscopy (EDS), and a Schottky apparatus. The Work function for W-BaHfO3 cathodes is found to decrease with increasing W proportion, with a minimum of 2.97 ± 0.06 eV for the sample having 70% W. Lower work function values of 2.21 ± 0.13 and 1.68 ± 0.03 eV, respectively, are observed for the LaB6-20% BaHfO3 and GdB6- 20% BaHfO3 cathodes.
- Subject
- thermionic emitters; perovskite; hexaborides; Rietveld refinement; work function
- Identifier
- http://hdl.handle.net/1959.13/1494223
- Identifier
- uon:53741
- Identifier
- ISSN:0921-5107
- Language
- eng
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