Investigation of Eu^(3+) site occupancy and Eu-O covalency in nanocrystalline Y_2O_3 by Mossbauer spectroscopy

A sample of nanocrystalline Y1.8Eu0.2O3 was examined by 151Eu Mössbauer spectroscopy. The degree of covalency of the Eu-0 bond has been studied. The spectrum of the cubic Y1.8Eu0.2O3 sample has been resolved into 2 contributions due to europium in the C3i and C2 sites, for the first time in 151Eu Mössbauer spectroscopy. The degree of covalency and the electric field gradient of the 2 sites has been compared. The occupancy, by the lanthanide ion, of the more and less symmetric sites in the cubic structure of Y1.8Eu0.2O3 has been investigated and discussed.

Trovami (UniCASearch)


Titolo: Investigation of Eu^(3+) site occupancy and Eu-O covalency in nanocrystalline Y_2O_3 by Mossbauer spectroscopy
Autori: 
CONCAS, GIORGIO
CONGIU, FRANCESCO
SPANO, GIORGIO
mostra contributor esterni 
Data di pubblicazione: 2002
Abstract: A sample of nanocrystalline Y1.8Eu0.2O3 was examined by 151Eu Mössbauer spectroscopy. The degree of covalency of the Eu-0 bond has been studied. The spectrum of the cubic Y1.8Eu0.2O3 sample has been resolved into 2 contributions due to europium in the C3i and C2 sites, for the first time in 151Eu Mössbauer spectroscopy. The degree of covalency and the electric field gradient of the 2 sites has been compared. The occupancy, by the lanthanide ion, of the more and less symmetric sites in the cubic structure of Y1.8Eu0.2O3 has been investigated and discussed.
Handle: http://hdl.handle.net/11584/47950
ISBN: 978-1-4020-1087-3
Tipologia:2.1 Contributo in volume (Capitolo o Saggio)

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