Structural characterization of epitaxial CrxMo1-x alloy thin films
Journal Article
·
· Journal of Physics. Condensed Matter
To develop a model system containing regularly-spaced misfit dislocations for studies of the radiation resistance of nanoscale defects, epitaxial thin films of Cr, Mo, and Cr{sub x}Mo{sub 1-x} alloys were deposited on MgO(001) by molecular beam epitaxy. Film compositions were chosen to vary the lattice mismatch with MgO. The film structure was investigated with x-ray diffraction (XRD), Rutherford backscattering spectrometry (RBS), and scanning transmission electron microscopy (STEM). Epitaxial films with reasonably high crystalline quality and abrupt interfaces were achieved at a relatively low deposition temperature, as confirmed by STEM. However, it was found by XRD and RBS in the channeling geometry that increasing the Mo content of the CrMo alloy films degraded the crystalline quality, despite the improved lattice match with MgO. XRD rocking curve data indicated that regions of different crystalline order may be present within the films with higher Mo content. This is tentatively ascribed to spinodal decomposition into Cr-rich and Mo-rich regions, as predicted by the Cr{sub x}Mo{sub 1-x} phase diagram.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1034229
- Report Number(s):
- PNNL-SA-81559; 42317; KC0201020
- Journal Information:
- Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 9 Vol. 24; ISSN 0953-8984; ISSN JCOMEL
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
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