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Sb-rich nanoinclusions in an AlGaAsSb metamaterial

Published online by Cambridge University Press:  29 January 2019

Nikolay A. Bert
Affiliation:
Ioffe Institute, 26 Polytekhnicheskaya ul., Saint Petersburg194021, Russia
Vladimir V. Chaldyshev*
Affiliation:
Ioffe Institute, 26 Polytekhnicheskaya ul., Saint Petersburg194021, Russia
Nikolay A. Cherkashin
Affiliation:
CEMES, CNRS and Université de Toulouse, 29 rue Jeanne Marvig, 31055Toulouse Cedex 4, France
Vladimir N. Nevedomskiy
Affiliation:
Ioffe Institute, 26 Polytekhnicheskaya ul., Saint Petersburg194021, Russia
Valery V. Preobrazhenskii
Affiliation:
Institute of Semiconductor Physics, 13 ac. Lavrentiev ave., Novosibirsk630090, Russia
Michael A. Putyato
Affiliation:
Institute of Semiconductor Physics, 13 ac. Lavrentiev ave., Novosibirsk630090, Russia
Boris R. Semyagin
Affiliation:
Institute of Semiconductor Physics, 13 ac. Lavrentiev ave., Novosibirsk630090, Russia
Vitaliy I. Ushanov
Affiliation:
Ioffe Institute, 26 Polytekhnicheskaya ul., Saint Petersburg194021, Russia CEMES, CNRS and Université de Toulouse, 29 rue Jeanne Marvig, 31055Toulouse Cedex 4, France Institute of Semiconductor Physics, 13 ac. Lavrentiev ave., Novosibirsk630090, Russia
Maria A. Yagovkina
Affiliation:
Ioffe Institute, 26 Polytekhnicheskaya ul., Saint Petersburg194021, Russia
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Abstract

We studied the microstructure of Al0.28Ga0.72As0.972Sb0.028 metamaterials containing a developed array of AsSb nanoinclusions. The AlGaAsSb films were grown by low-temperature molecular-beam epitaxy followed by high-temperature annealing at 750°C. The process resulted in an array of self-organized AsSb nanonclusions with an average diameter of 15 nm. The volume filling factor was about 0.003. Using transmission electron microscopy and x-ray diffraction we showed that the nanoinclusions have A7-type rhombohedral atomic structure with the following orientation in the matrix (0003)p || {111}m and [-2110]p || 〈220〉m, where p and m indices indicate the AsSb precipitate and AlGaAsSb matrix, correspondingly. The nanoinclusions appeared to be strongly enriched by antimony (more than 90 atomic %), whereas the Sb content in the AlGaAsSb matrix was 2.8 atomic %. The strong enrichment of the inclusion with Sb resulted from the local thermodynamic equilibrium between the solid AlGaAsSb matrix and AsSb inclusions which became liquid at a formation temperature of 750°C.

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Articles
Copyright
Copyright © Materials Research Society 2019 

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References

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