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![Figure 1. Scheme of the binary collision approximation [27].](profile/Farid-Umarov/publication/305524450/figure/fig1/AS:398090096922624@1471923483107/Scheme-of-the-binary-collision-approximation-27_Q320.jpg)
An [FeIII8] hexagonal bipyramid displays antiferromagnetic exchange between the two capping tetrahedral ions and the six ring octahedral ions resulting in a spin ground state, S = 10.
Citations
In the rare-earth SmCoO3 perovskite, Co3+ ions at low temperatures appear to be in the low-spin state with S = 0, t
2g
2
e
g
0. If Ca2+ ions partially substitute Sm3+ ions, oxygen deficient Sm1 − x
Cax
CoO3 − δ solid solutions with δ = x/2 appear. The oxygen deficiency leads to the formation of pyramidally coordinated cobalt ions Co
pyr3+ in addition to the existing cobalt ions Co
oct3+ within the oxygen octahedra. Even at low temperatures, these ions have a magnetic state, either S = 1, t
2g
5
e
g
1 or S = 2, t
2g
4
e
g
2. At low temperatures, the magnetization of Sm1 − x
Cax
CoO3 − δ is mainly determined by the response of Co
pyr3+ ions. Owing to the characteristic features of the crystal structure of the oxygen deficient perovskite, these ions form a set of nearly isolated dimers. At high temperatures, the magnetization of Sm1 − x
Cax
CoO3 − δ is mainly determined by the response of Co
oct3+ ions, which exhibit a tendency to undergo the transition from the S = 0, t
2g
6
e
g
0 state to the S = 1, t
2g
5
e
g
1 or S = 2, tt
2g
4
e
g
2 state. In addition, the magnetization and specific heat of the solid solutions under study include the contribution from the rare-earth subsystem, which undergoes a magnetic ordering at low temperatures.
