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Type: Artigo de evento
Title: Valence Averaging And Phase Transitions In Europium (eu2vo4) And Iron (rsr2fe3o9) Compounds
Author: Nowik I.
Herber R.H.
Felner I.
Awana V.P.S.
Abstract: Mössbauer studies of 151Eu in Eu2VO4 reveal a very sharp valence averaging phase transition at 450 K. Two equally intense absorption lines, differing in isomer shift by 12.7 mm/s, corresponding to Eu2+ and Eu3+, collapse to a single absorption line at the average isomer shift. The transition is confirmed by X-ray and resistivity measurements. In RSr2Fe3O9 (R = Pr, Sm) 57Fe studies reveal averaging valence phase transitions coinciding with magnetic order phase transitions at 190 K and 140 K, respectively. Two magnetic sextets, corresponding to 2Fe3+ + Fe5+, collapse to two singlets corresponding to 2Fe4+ + Fe3+.
Rights: fechado
Identifier DOI: 10.1023/A:1012655620041
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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