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About the nature of Ni3+ magnetic centres in the LaSrAl1−xNixO4 ceramics

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Abstract

LaSrAl1−x Ni x 04 (x≤0.11) ceramics werer studied by EPR. It was established that Ni3+ ions in this compound may be in two states: a low spin one with t 62g e 1 g electron configuration and high spin state with t 52g e 2 g electron configuration. It was shown that the random distribution of La3+ and Sr2+ ions in the heavy metal sublattice leads to two kinds for each type of these centres with different degree of tetragonal distortions. The total concentration of NiO6 isolated centres in these ceramics does not exceed 5–10 % of a total number of nickel ions at a givenx. A model, explaining these peculiarities observed in an experiment by the enhanced tendency of Ni3+ ions to clusterization, was proposed. It appears that even at small concentrations Ni3+ ions form clusters and conglomerates, whose structural characteristics of the oxygen octahedra are comparable with those in LaSrNiO4.

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Authors and Affiliations

  1. Zavoisky Physical-Technical Institute of the Academy of Sciences of the USSR, Sibirsky tract 10/7, 420029, Kazan, USSR

    Yu. V. Yablokov, T. A. Ivanova & S. Yu. Shipunova

  2. Leningrad State University, Leningrad, USSR

    N. V. Chezhina, I. A. Zvereva & N. P. Bobrysheva

Authors
  1. Yu. V. Yablokov
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  2. T. A. Ivanova
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  3. S. Yu. Shipunova
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  4. N. V. Chezhina
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  5. I. A. Zvereva
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  6. N. P. Bobrysheva
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Yablokov, Y.V., Ivanova, T.A., Shipunova, S.Y. et al. About the nature of Ni3+ magnetic centres in the LaSrAl1−xNixO4 ceramics. Appl Magn Reson 2, 547–558 (1991). https://doi.org/10.1007/BF03166062

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  • DOI: https://doi.org/10.1007/BF03166062

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