Magnetic exchange interactions in perovskite solid solutions. Part 3. Tin-119 Mössbauer spectra of doped iron perovskite solid solutions

Abstract

A detailed study has been made of supertransferred hyperfine field (s.t.h.f.) effects at ¹¹⁹Sn doped into various perovskites with the formula (A_0.95Ca_0.05)(Fe_0.85M_0.10Sn_0.05)O₃ with A = La, Eu, or Lu and M = Al, Ga, Sc, Cr, Mn, Co, or Ni. The observed s.t.h.f. for ¹¹⁹Sn with six nearest-neighbour Fe³⁺ cations is strongly dependent on the nature of A, but is almost independent of the M substituent. The s.t.h.f. is also sensitive to the radius of a diamagnetic M³⁺ substituent at the nearest-neighbour sites. The paramagnetic substituents Cr³⁺, Mn³⁺, and Ni³⁺ have been shown to give a s.t.h.f. at ¹¹⁹Sn which has the same sign as that produced by the Fe³⁺ cations of the host lattice.