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An x‐ray diffraction study on the microstructure of vapor‐deposited fcc lead films: normal and oblique incidences

 

作者: R. K. Nandi,   S. P. Sen Gupta,  

 

期刊: Journal of Applied Physics  (AIP Available online 1979)
卷期: Volume 50, issue 10  

页码: 6262-6266

 

ISSN:0021-8979

 

年代: 1979

 

DOI:10.1063/1.325764

 

出版商: AIP

 

数据来源: AIP

 

摘要:

Detailed x‐ray diffraction investigations, based on precise measurements of the position, asymmetry, broadening, and shape of x‐ray diffraction profiles 111, 200, 220, 311, 222, and 400 recorded in a counter diffractometer, have been performed on vacuum‐evaporated fcc lead films in the range of thickness ∼300–6500 A˚. The films are deposited on glass substrates at a residual air pressure ∼5×10−5Torr for both normal and oblique vapor directions. The complete analyses have revealed clearly the microstructural features in these vapor‐deposited films. Near‐isotropy in the domain size and rms strain values with a relatively less size effect has been observed. The magnitudes of the respective compound fault parameters, close to the error limits, indicate the total absence of intrinsic (&agr;′), extrinsic (&agr;″), and even growth twin (&bgr;) stacking faults in the films. The dislocation density (&rgr;) is typical for thin films and is ∼1011cm/cm3. The residual internal stresses (&sgr;), compressive in nature, are small, and the small lattice parameter changes show a contraction in the plane of the film. The films are found to be highly oriented along [111] irrespective of the source position. It has been observed that the microstructural parameters exhibit more or less a regular variation with film thickness and are less influenced by the source position.

 

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