Structural, magnetic and magnetocaloric properties of layered perovskite La1.1Bi0.3Sr1.6Mn2O7

Abstract The La 1.1 Bi 0.3 Sr 1.6 Mn 2 O 7 sample was synthesized by coprecipitation method. Its structure has been characterized by X-ray powder diffraction. The diffraction patterns are consistent with the I4/mmm symmetry, with tetragonal lattice parameters a =3.8750±0.0001 A and c =20.0456±0.0002 A. Magnetic measurements have shown a ferromagnetic like ordering with second order magnetic phase transition to paramagnetic states. The magnetic entropy change caused by a magnetic field, (−∆ S max ), was estimated on the basis of the Maxwell relation. The maximum magnetic entropy change (−∆ S max ) and the relative cooling power (RCP) are, 1.65 J kg −1 K −1 and 134.4 J kg −1 respectively, for a 5 T magnetic field change at 340 K.