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Nanomechanical and microtribological properties of yttrium thin films for photocathode engineering
- Source :
- Journal of Vacuum Science & Technology A. 37:031507
- Publication Year :
- 2019
- Publisher :
- American Vacuum Society, 2019.
-
Abstract
- 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 μ ∼ 0.34, lower than that for the Cu (μ ∼ 0.38). Moreover, nanoscratch 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.
- Subjects :
- Materials science
Diamond
chemistry.chemical_element
Surfaces and Interfaces
Yttrium
Nanoindentation
engineering.material
Condensed Matter Physics
Photocathode
Surfaces, Coatings and Films
Pulsed laser deposition
chemistry
engineering
Surface roughness
Thin film
Composite material
Elastic modulus
Subjects
Details
- ISSN :
- 15208559 and 07342101
- Volume :
- 37
- Database :
- OpenAIRE
- Journal :
- Journal of Vacuum Science & Technology A
- Accession number :
- edsair.doi.dedup.....86ddc3b36f329cdab2e5065d243e471d
- Full Text :
- https://doi.org/10.1116/1.5088106