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

doi:10.1006/jssc.2002.9699

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

PRESNIAKOV, Igor
Chair of Radiochemistry, Department of Chemistry

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

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Journal of Solid State Chemistry. 2002, vol. 168, n° 1, p. 126-133

Elsevier

Résumé en anglais

Nickelates ANiO3 (A=Pr, Nd, Sm, Lu, Y, Tl) containing Mössbauer probe 57Fe atoms were synthesized. In the case of nickelates with larger rare earth (A=Pr, Nd, Sm) the Mössbauer spectra confirm that ferric ions are located in single type of crystallographic positions. On the contrary, the spectra of ANi0.98Fe0.02O3 with small cations (A=Lu, Y, Tl) can be described as a superposition of two sub-spectra which indicate that 57Fe probe atoms are simultaneously stabilized in two non-equivalent crystallographic positions. These results have been interpreted in terms of partial charge disproportionation of Ni3+ cations associated with the electronic localization in monoclinic distorted Lu, Y, Tl nickelates. The modification of 57Fe spectra for TlNi0.98Fe0.02O3 as a function of temperature has shown that this charge disproportionation occurs in varying degrees, corresponding to the charge states Fe(3+σ)+ and Fe(3−σ′)+. On the contrary, the spectra for Lu and Y nickelates show that charge variation (σ,σ′) for dopant Fe(1) and Fe(2) cations does not depend on temperature.< Réduire

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Mössbauer spectroscopy

Perovskite

Trivalent nickel

Charge disproportionation

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Mössbauer investigation of 57Fe-doped Ni(III) perovskites ANi0.98Fe0.02O3 (A = Pr, Nd, Sm, Y, Lu, Tl) versus temperature

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