Magnetic exchange interactions in perovskite solid solutions. Part 2. Iron-57 and 151 Eu Mössbauer spectra of EuFe1–xCrxO3(O < X < 1)

Abstract

The ¹⁵¹Eu and ⁵⁷Fe Mössbauer resonances have been used to study magnetic exchange interactions in the orthorhombic perovskite solid solution EuFe_1–xCr_xO₃(O < x < 1). The supertransferred hyperfine field (s.t.h.f,) at ⁵⁷Fe due to a Cr³⁺ nearest-neighbour cation has the same sign as that due to Fe³⁺, and the observed reduction in the flux density of the s.t.h.f. when Cr³⁺ replaces Fe³⁺ is 0.82 ± 0.02 T extrapolated to 0 K. The flux density of the molecular exchange field at Eu³⁺ due to a Cr³⁺ ion has the same sign as that due to Fe³⁺.