Published October 2005 | Version v1
Journal article Metadata-only

Chemical bond, local structure and hyperfine interactions of 57Fe atoms in RNi0.98Fe0.02O3 (R = La, Pr, Nd, Sm, Dy, Gd) nickelates

Creators

  • 1. Moskovskij Gosudarstvennyj Univ. im. M.V. Lomonosova, Moscow (Russian Federation)
  • 2. Inst. Khimii Kondensirovannogo Sostoyaniya, Bordo (France)
  • 3. Nauchno-Issledovatel'skij Inst. Yadernoj Fiziki Moskovskogo Gosudarstvennogo Univ. im. M.V. Lomonosova, Moscow (Russian Federation)

Description

By means of the Moessbauer spectroscopy one investigated into the local structure of RNi0.98Fe0.02O3 nickelates (R=REE) in 57Fe nuclei. For R = La, Pr, Nd within the region characterized by (T > TIM) conductivity Fe3+ cations are shown to occupy similar crystallographic positions. In case of R = Sm, Eu, Gd, Dy nickelates, 57Fe spectra measured under T<TIM consist of two components corresponding to three-valent cations of iron in various anion environment. The obtained results are in line with the neutron diffraction investigations assuming occurrence of partial charge ordering in nickel sublattice under T<TIM

Abstract (Russian)

Методом мeссбауэровской спектроскопии на ядрах 57Fe исследована локальная структура никелатов RNi0.98Fe0.02O3 (R = РЗЭ). Показано, что для R = La, Pr, Nd в области с металлическим типом проводимости (T > Tим) катионы Fe3+ занимают однотипные кристаллографические позиции. В случае же никелатов R = Sm, Eu, Gd, Dy спектры 57Fe, измеренные при Т < Tим, состоят из двух компонент, отвечающих трехвалентным катионам железа в различном анионном окружении. Полученные результаты согласуются с нейтронографическими исследованиями, предполагающими протекание при Т < Tим частичного зарядового упорядочения в подрешетке никеля

Additional details

Additional titles

Original title (Russian)
Химическая связ', структура локального окружения и сверхтонкие взаимодействия атомов

Publishing Information

Journal Title
Izvestiya Akademii Nauk. Rossijskaya Akademiya Nauk. Seriya Fizicheskaya
Journal Volume
69
Journal Issue
10
Journal Page Range
p. 1503-1507
ISSN
1026-3489
CODEN
IRAFEO

Conference

Title
9. International conference Moessbauer spectroscopy and its applications
Original Conference Title
IX Mezhdunarodnaya konferentsiya Messbauehrovskaya spektroskopiya i ee primeneniya
Dates
21-25 Jun 2004
Place
Ekaterinburg (Russian Federation)

INIS

Country of Publication
Russian Federation
Country of Input or Organization
Russian Federation
INIS RN
38042904
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
Resource subtype / Literary indicator
Conference, Numerical Data
Descriptors DEI
CHEMICAL BONDS; CRYSTAL-PHASE TRANSFORMATIONS; CUBIC LATTICES; EXPERIMENTAL DATA; HYPERFINE STRUCTURE; IRON ADDITIONS; MOESSBAUER EFFECT; NEUTRON DIFFRACTION; NICKELATES; RARE EARTH COMPOUNDS; SPECTRA; STRUCTURAL CHEMICAL ANALYSIS
Descriptors DEC
ALLOYS; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DATA; DIFFRACTION; INFORMATION; IRON ALLOYS; NICKEL COMPOUNDS; NUMERICAL DATA; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; SCATTERING; TRANSITION ELEMENT ALLOYS; TRANSITION ELEMENT COMPOUNDS

Optional Information

Notes
16 refs., 4 figs.