Phase behavior and some properties of LaMn1−xRhxO3 solid solution

Structure and magnetism of the Rh4+-containing perovskite oxides La0.5Sr0.5Mn0.5Rh0.5O3and La0.5Sr0.5Fe0.5Rh0.5O3

“…35,37 This mechanism can also be invoked to explain the ferromagnetic behaviour of LaMn 0.5 Rh 0.5 O 3 as it is observed that the substitution of diamagnetic, low-spin d 6 , Rh 3+ into LaMnO 3 suppresses the static Jahn-Teller distortion of the Mn III O 6 units in a manner directly analogous to Ga 3+ substitution. 15,38 We propose that this dynamic Jahn-Teller mechanism is also the origin of the ferromagnetic behaviour of La 0.5 Sr 0.5 Mn 0.5 Rh 0.5 O 3 , as the substitution of Rh 4+ for Mn 3+ suppresses the static Jahn-Teller distortion of the manganese centres, leading to ferromagnetic couplings between Mn 3+ cations in this cation-disordered material. It may be expected that the presence of paramagnetic Rh 4+ centres would perturb the ferromagnetic Mn-O-Mn couplings, however the observation that the Curie temperature of La 0.5 Sr 0.5 Mn 0.5 Rh 0.5 O 3 (T c ∼ 60 K) is very similar to those of LaMn 0.5 Rh 0.5 O 3 (T c = 65 K) 15,16 and LaMn 0.5 Ga 0.5 O 3 (T c = 70 K) 35,36 indicates any Mn-O-Rh couplings present are weak.…”

Synthesis, structure and properties of LnMn1/2Rh1/2O3 (Ln=rare earth)

“…Though single phase of LaMn 1/2 Rh 1/2 O 3 [19] was formed at 1273 K in air, little higher temperature is needed to synthesize the phases containing other rare earth element of higher atomic number. We successfully synthesized single phases for LnMn 1/2 Rh 1/2 O 3 (Ln = Pr, Nd, Sm, Eu, Gd) series by heating the samples at 1323 K in air.…”

“…2. Transformation from O -to O-type orthorhombic was seen at x = 0.6 for LaMn 1−x Rh x O 3 solid solution [19]. For NdMn 1−x Rh x O 3 solid solution [27], the transformation was seen at x = 0.4.…”

“…Within the study of rhodium containing compounds, we were successful in synthesizing LaMn 1−x Rh x O 3 solid solution [19]. Although LaMn 1/2 Rh 1/2 O 3 has been studied [18,19], the behavior of other members of the series of LnMn 1/2 Rh 1/2 O 3 (Ln = rare earth) has not yet been investigated.…”

“…Within the study of rhodium containing compounds, we were successful in synthesizing LaMn 1−x Rh x O 3 solid solution [19]. Although LaMn 1/2 Rh 1/2 O 3 has been studied [18,19], the behavior of other members of the series of LnMn 1/2 Rh 1/2 O 3 (Ln = rare earth) has not yet been investigated. We successfully synthesized single phases of LnMn 1/2 Rh 1/2 O 3 (Ln = Pr, Nd, Sm, Eu, Gd) in addition to LaMn 1/2 Rh 1/2 O 3 and determined that all the structures have orthorhombic symmetry but have variations in magnetic and electronic properties.…”