This article is cited in 1 paper

Magnetism

Specific features of local structural, valence, and magnetic states of iron ions in the perovskite Bi$_{0.5}$Ca$_{0.5}$FeO$_3$

V. S. Pokatilov, A. O. Konovalova, V. V. Pokatilov

MIREA — Russian Technological University, Moscow

Abstract: The perovskite Bi$_{0.5}$Ca$_{0.5}$FeO$_3$ has been investigated using the Mössbauer effect at temperatures of 295 and 675 K. The measured temperature of the magnetic phase transition (Néel temperature) is $T_N$ = 640 $\pm$ 10 K. Above the Néel temperature, there are two nonequivalent structural states of iron ions. In the perovskite Bi$_{0.5}$Ca$_{0.5}$FeO$_3$ at room temperature, there are seven most probable nonequivalent magnetic states of iron ions with significantly different values of the hyperfine interaction parameters. Four iron states correspond to Fe$^{3+}$ ions in the octahedral oxygen environment, and three iron states correspond to Fe$^{3+}$ ions in the tetrahedral oxygen environment.

Received: 09.08.2013

 English version: Physics of the Solid State, 2014, 56:4, 695–700

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