| Autor: |
Yablokov, Yu., Ivanova, T., Shipunova, S., Chezhina, N., Zvereva, I., Bobrysheva, N. |
| Zdroj: |
Applied Magnetic Resonance; Sep1991, Vol. 2 Issue 3, p547-558, 12p |
| Abstrakt: |
LaSrAlNi0 ( x≤0.11) ceramics werer studied by EPR. It was established that Ni ions in this compound may be in two states: a low spin one with te electron configuration and high spin state with te electron configuration. It was shown that the random distribution of La and Sr 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 NiO isolated centres in these ceramics does not exceed 5-10 % of a total number of nickel ions at a given x. A model, explaining these peculiarities observed in an experiment by the enhanced tendency of Ni ions to clusterization, was proposed. It appears that even at small concentrations Ni ions form clusters and conglomerates, whose structural characteristics of the oxygen octahedra are comparable with those in LaSrNiO. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink