Transmission electron microscopy and X-ray diffraction study of α'-Al2 CO crystals

Joanna N. Gorecka 2,  Piotr Dłużewski 2,  Adam Gorecki 1,4,  Wojciech Paszkowicz ,  Miroslaw Kozlowski 2,  A. Yamaguchi 3

1. Warsaw University, Faculty of Physics, Hoża 69, Warszawa 00-681, Poland
2. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
3. Nagoya Institute of Technology, Dept of Materials Science end Engineering, Gokiso-cho,Showa-ku, Nagoya 466-8555, Japan
4. Warsaw University, Interdisciplinary Centre for Matematical and Computational Modeling (ICM UW), Pawinskiego 5,building D,floor 5, Warszawa 02-106, Poland

Abstract

Saphire crystal is widely used as a substrate materials for semiconductor,
superconductor and metallic layers. Incorporation of carbon atoms into cationic or anionic sites may modify its properties. In the Al-C-O system two ternary compounds are known: Al2 CO and Al4 O4 C. For Al2 CO two polimorphs: α and α'
have been reported. The polimorph α-Al2 CO crystallizes in wurtzite structure
with a=3.170 A and c=5.078 A the structure of α'-Al2 CO is not fully understood yet. In this paper we suggest crystal structure for α'-Al2 CO
obtained by use of different optimisation methods. The proposed structure is consistent with X-ray diffraction and transmission electron microscopy results.

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Presentation: poster at E-MRS Fall Meeting 2003, Symposium B, by Joanna N. Gorecka
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-27 20:41
Revised:   2003-05-27 21:48
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