Abstract
The bulk and powdered La 0.7Sr 0.3MnO 3 ceramic sample was investigated by neutron diffraction in the temperature range from 80 to 280 K and in magnetic field up to 4.5 T. The crystallographic and magnetic structures were analyzed by the Rietveld method. An increased contribution of the orthorhombic Pbnm phase was observed after powdering the bulk ceramic sample with rhombohedral structure described by the R3̄c space group. The appearance of the orthorhombic part (20–30%) was explained by Sr or/and O escape out of the grain surface. The refined magnetic moment, μ=3.7 μ B, was consistent with the theoretical value calculated from the hole doping level. The temperature dependence of the unit-cell parameters of the dominating rhombohedral phase was also determined.
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