Abstract
The lanthanum deficient La 0.6− x □ x Ca 0.4MnO 3 (0 ≤ x ≤ 0.2) have been elaborated and investigated by X-ray diffraction (XRD) and magnetic measurements. The samples have been synthesized by the solid-state reaction method at high temperatures. All samples crystallize in the orthorhombic system with Pnma space group. Lanthanum deficiency leads to a decrease of the unit cell volume. Magnetization measurements versus temperature in a magnetic applied field of 50 mT showed that all samples are ferromagnetic at low temperature. With increasing lanthanum deficiency, the Curie temperature T c decreases from 280 K for x = 0 to 170 K for x = 0.2.
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