BARANOV, Alexey; PRESNIAKOV, Igor; DEMAZEAU, Gérard; SOBOLEV, Alexey; OVANESYAN, N. S.; PANKRATOV, D. A.; POKHOLOK, Konstantin; GODOVIKOV, S. K.

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BARANOV, Alexey
Chair of Radiochemistry, Department of Chemistry

PRESNIAKOV, Igor
Chair of Radiochemistry, Department of Chemistry

DEMAZEAU, Gérard
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Ce document a été publié dans

Russian Journal of Inorganic Chemistry / Zhurnal Neorganicheskoi Khimii. 2005, vol. 50, n° 2, p. 246-252

MAIK Nauka/Interperiodica

Résumé en anglais

Hyperfine interactions of 57Fe probe atoms in the perovskite structures of the NdNi0.98Fe0.02O3 and LuNi0.98Fe0.02O3 nickelates were studied by Mössbauer spectroscopy. The cardinal difference between the 57Fe spectra of these nickelates was shown to be associated with the specifics of their local crystal structure. Mea- suring the Mössbauer spectra on both sides from the point of the insulator–metal phase transition (TIM) made it possible to comprehensively study the dynamic behavior of dopant iron atoms. Different models were considered to account for the abrupt change in the chemical shift of the 57Fe atoms in the structure of NdNi0.98Fe0.02O3 at TTIM (148 K).< Réduire

Mots clés en anglais

Nickelates

Insulator-metal transition

Mössbauer spectroscopy

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026