Redetermination of the distorted perovskite Nd_0.53Sr_0.47MnO₃

Abstract

Neodymium strontium manganese oxide with ideal composition Nd0.5Sr0.5MnO3 was reported to have two different structure models. In one model, the x coordinate of an O atom is at x > 1/2, while in the other model the x-coordinate of this atom is at x < 1/2. Difference-density maps around this O atom obtained from the current redetermination clearly show that the structure with the O atom at x < 1/2 result in a more satisfactory model than that with x > 1/2. The title compound with a refined composition of Nd0.53 (5)Sr0.47 (5)MnO3 is a distorted perovskite-type structure with site symmetries 2mm for the statistically occupied (Nd, Sr) site and for the above-mentioned O atom, .2/m. for the Mn atom and ..2 for a second O-atom site. In contrast to previous studies, the displacement factors for all atoms were refined anisotropically.

Pressure-induced tuning of a magnetic phase separation in Nd0.53Sr0.47MnO3<

“…The lattice parameters (a= 5.44(4)Å, b= 5.43(4)Å, c= 7.55(4)Å) obtained at ambient pressure were found to be in good agreement with those reported in Ref. 21 . Indeed, the A-type AFM phase observed in Sr doped NdMnO 3 manganites for x>0.51 is accompanied by the onset of a tetragonal crystal structure.…”