Ytterbium and iron-doped ytterbium films were prepared by vapor quenching on Kapton substrates at room temperature. Structural characterization was performed by X-ray diffraction and transmission electron microscopy. The aim was to study the microstructure of pure and iron-doped films and thereby to understand the effects induced by iron incorporation. A coexistence of face centered cubic and hexagonal close packed-like structures was observed, the cubic-type structure being the dominant contribution. There is an apparent thickness dependence of the cubic/hexagonal relative ratios in the case of pure ytterbium. Iron-clusters induce a crystalline texture effect, but do not influence the cubic/hexagonal volume fraction. A schematic model is proposed for the microstructure of un-doped and iron-doped films including the cubic- and hexagonal-like structures, as well as the iron distribution in the ytterbium matrix.
Bibliographical noteFunding Information:
This work has been made possible by financial support from FAPERJ ( BOLSA NOTA 10 E-26/100.382/2012 ), CAPES , FAPES (Grant No. 54658551/11 and 54866286/11 ), CNPq/PCI , and Brazilian-German research programs financed by CNPq-DFG ( 444BRA-113/55/0-1 ) and CAPES-DAAD ( PROBRAL, Ref 389/13389/13 ). The authors gratefully acknowledge the use of the facilities for electron microscopy in the LabNano/CBPF, Rio de Janeiro-BR.
- Fe clusters
- Fe-doped Yb films
- Transmission electron microscopy
- Vapor condensation
- Yb films