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Nanomechanical and microtribological properties of yttrium thin films for photocathode engineering
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, Faculty of Science & Engineering. SKF Res and Dev Ctr, Netherlands.ORCID iD: 0000-0003-3277-1945
Univ Salento, Italy; Ist Nazl Fis Nucl, Italy.
Univ Salento, Italy; Ist Nazl Fis Nucl, Italy.
Univ Patras, Greece.
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2019 (English)In: Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films, ISSN 0734-2101, E-ISSN 1520-8559, Vol. 37, no 3, article id 031507Article in journal (Refereed) Published
Abstract [en]

The authors study the nanomechanical and microtribological properties of yttrium (Y) thin films deposited by pulsed laser deposition on Cu polycrystalline substrates. Nanoindentation tests reveal that such films have a high hardness of H = 2.3 GPa and a reduced elastic modulus of 71.7 GPa with respect to the Cu substrates. The friction coefficient between a diamond tip and the Y film reaches a steady state value of mu similar to 0.34, lower than that for the Cu (mu similar to 0.38). Moreover, nano-scratch experiments show that Y films are more scratch-resistant than the Cu substrates, probably due to their greater hardness, higher elastic recovery, and lower friction coefficient. Their results confirm that the mechanical and tribological properties of the Y films are suitable for designing and fabricating scratch-resistant hybrid photocathodes and can reduce instabilities and unwanted discharges in the cavity of the radio-frequency gun. Furthermore, the low surface roughness and the low work function of the material are important characteristics for a photocathode based on the Y thin film for the production of high-brightness electron beams. Published by the AVS.

Place, publisher, year, edition, pages
A V S AMER INST PHYSICS , 2019. Vol. 37, no 3, article id 031507
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
URN: urn:nbn:se:liu:diva-159002DOI: 10.1116/1.5088106ISI: 000472182400019OAI: oai:DiVA.org:liu-159002DiVA, id: diva2:1338107
Note

Funding Agencies|Italian National Institute of Nuclear Physics (INFN) - Italian Ministry of Research in the framework of FIRB [RBFR12NK5K]

Available from: 2019-07-19 Created: 2019-07-19 Last updated: 2019-07-19

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Broitman, Esteban
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Department of Physics, Chemistry and BiologyFaculty of Science & Engineering
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Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)

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