KIM, Seung-Joo; DEMAZEAU, Gérard; PRESNIAKOV, Igor A.; POKHOLOK, Konstantin; SOBOLEV, Alexey V.; BARANOV, Alexey; PANKRATOV, D. A.; OVANESYAN, Nikolay S.

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KIM, Seung-Joo
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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

PRESNIAKOV, Igor A.
Moscow State University

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Ce document a été publié dans

Russian Journal of Inorganic Chemistry / Zhurnal Neorganicheskoi Khimii. 2002, vol. 47, n° 9, p. 1387-1393

MAIK Nauka/Interperiodica

Résumé en anglais

The ANi0.98Fe0.02O3 nickelates (A = Pr, Nd, Sm, Lu, Y, Tl) were studied above the temperature of their magnetic ordering (TN) by 57Fe Mössbauer spectroscopy. Orthorhombic nickelates (A = Pr, Nd, Sm) have the only type of Fe(III) position in the symmetric octahedral oxygen surroundings. The 57Fe spectra of monoclinic nickelates (A = Lu, Y, Tl) show two components, which can be assigned to the dopant trivalent iron cations substituted for nickel in the Ni(3frame0')+O6 and Ni(3+)+O6 polyhedra. The data obtained are consistent with the results of neutron diffraction studies of ANiO3 , assuming the 2Ni3+ frame1 Ni(3frame2')+ + Ni(3+)+ disproportionation for monoclinic nickelates (A = Y, Ho-Lu) at T < TIM .< Réduire

Mots clés en anglais

Mössbauer spectroscopy

Nickelates

Magnetism

Crystal structure

Origine

Importé de hal

Unités de recherche

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