NIR absorption of Nb4+ polarons in reduced SBN crystals

Autor(en): Gao, M
Kapphan, S
Pankrath, R
Zhao, JL
Stichwörter: Materials Science; Materials Science, Multidisciplinary; Physics; Physics, Condensed Matter
Erscheinungsdatum: 2000
Herausgeber: GORDON BREACH SCI PUBL LTD
Journal: FERROELECTRICS
Volumen: 239
Ausgabe: 1-4
Startseite: 1121
Seitenende: 1126
Zusammenfassung: 
A broad absorption band around 0.72 eV, assigned to the absorption of Nb4+ polarons, is observed, even at room temperature and above, in pure SBN, SBN:Cr or SBN:Ce crystals after previous reduction treatment at T>800 degrees C in Ar, vacuum or H-2. The absorption spectrum of Nb4+ polarons in reduced SBN crystals shows a considerable dichroism, which exists even far above room temperature. The spectral shape of the Nb(4+)polaron absorption shifts to higher energies with decreasing temperature. The concentration of polarons can be estimated from the magnetic susceptibility[1] and yields a value of the optical oscillator strength f approximate to 5 x 10(-2) for the NIR-absorption.
Beschreibung: 
9th European Meeting on Ferroelectricity (EMF-9), PRAGUE, CZECH REPUBLIC, JUL 12-16, 1999
ISSN: 00150193

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