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Atomic and electronic structure of gadolinium oxide

Published online by Cambridge University Press:  27 January 2014

Timofey Viktorovich Perevalov ,
Andrey Evgenievich Dolbak ,
Vasilii Aleksandrovich Shvets ,
Vladimir Alekseevich Gritsenko ,
Tatijana Ivanovna Asanova  and
Simon Borisovich Erenburg
Timofey Viktorovich Perevalov*
Affiliation:
A.V. Rzhanov Institute of Semiconductor Physics of SB RAS, 13 Lavrentieva ave., 630090 Novosibirsk, Russian Federation
Andrey Evgenievich Dolbak
Affiliation:
A.V. Rzhanov Institute of Semiconductor Physics of SB RAS, 13 Lavrentieva ave., 630090 Novosibirsk, Russian Federation
Vasilii Aleksandrovich Shvets
Affiliation:
A.V. Rzhanov Institute of Semiconductor Physics of SB RAS, 13 Lavrentieva ave., 630090 Novosibirsk, Russian Federation
Vladimir Alekseevich Gritsenko
Affiliation:
A.V. Rzhanov Institute of Semiconductor Physics of SB RAS, 13 Lavrentieva ave., 630090 Novosibirsk, Russian Federation
Tatijana Ivanovna Asanova
Affiliation:
Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Lavrentiev ave., 630090 Novosibirsk, Russian Federation
Simon Borisovich Erenburg
Affiliation:
Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Lavrentiev ave., 630090 Novosibirsk, Russian Federation
*
ae-mail: [email protected]
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Abstract

Rare earth gadolinium oxide film has been studied by X-ray absorption fine structure (XAFS) at Gd L3-edge and energy electron loss spectroscopy (EELS) spectroscopies. XAFS data showed that the nearest Gd coordination shells consist of six oxygen atoms at ~2.308(2) Å and six gadolinium atoms at ~3.57(2) Å corresponding to Gd2O3 with a space group of Ia-3. EELS analysis of the film revealed excitations at the energies of 14.2, 19.9 eV which are due to electron transition from the valence band to the conductive one; excitations at the energies of 22.2–23.5 eV originated from valence electrons plasmon oscillations (bulk plasmons); and the excitation at 5.5 eV resulted from the electron transition at defects. When the photon energy changed from 1.5 to 5.0 eV the refractive index increased from 1.92 to 2.15.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 65 , Issue 1 , January 2014 , 10702
Copyright
© EDP Sciences, 2014

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