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Imaging and Diffraction Study of Continuous α‐Fe2O3Films on (0001)Al2O3

 

作者: Lisa A. Tietz,   C. Barry Carter,  

 

期刊: Journal of the American Ceramic Society  (WILEY Available online 1992)
卷期: Volume 75, issue 5  

页码: 1097-1102

 

ISSN:0002-7820

 

年代: 1992

 

DOI:10.1111/j.1151-2916.1992.tb05544.x

 

出版商: Blackwell Publishing Ltd

 

关键词: iron oxide;films;alumina;interfaces;transmission;electron microscopy

 

数据来源: WILEY

 

摘要:

Continuous α‐Fe2O3films grown on bulk (0001)Al2O2substrates by low‐pressure chemical vapor deposition have been studied by transmission electron microscopy and the observations compared to those obtained from discontinuous films at an earlier stage of the growth process. Plan‐view specimens revealed significant thermal stress in the continuous films, while cross‐sectional specimens showed that cracking occurs in thicker films. The free surface of the film and the film/substrate interface appeared sharp and flat, apart from growth ledges and steps. Weak‐beam imaging revealed a hexagonal misfit dislocation network consisting of perfect edge dislocations. Fine structure in the selected‐area diffraction patterns which corroborates these observations is also discussed. The misfit network of partial dislocations previously observed in the discontinuous films was not observed for the continuous films, indicating an effect of film thickness, growth rate, or surface preparation on the Fe2O3/(0001)Al2O3interfa

 

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