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  1. 1 Open Physics

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  1. 1 2009

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  1. 1 Bejar M.

  2. 1 Dhahri E.

  3. 1 Hlil E.

  4. 1 Tozri A.

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Structural and magnetic characterisation of the perovskite oxides La0.7Ca0.3−x NaxMnO3

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Tozri A., Bejar M., Dhahri E., Hlil E.
Open Physics
|
2009
|
vol. 7
|
issue 1
89-95
EN
X-ray powder diffraction (XRD) and magnetic measurements were performed in order to investigate the effect of Na+ ion substitution for Ca2+ ions on the crystallographic structure, the character of magnetic ordering, and the effect of transition temperature in La0.7Ca0.3−x NaxMnO3 manganites series (0 ⩽ × ⩽ 0.2). All samples crystallise in an orthorhombic structure with the Pnma space group. We have found a strong dependence of structural and magnetic properties on the cation-size disorder parameter σ 2. The temperature dependence of magnetization of all samples obeys the Bloch T 3/2 law. The values of the spin wave constant at low temperature B increase with the increase of x and the Curie temperature decreases. It is concluded that the substitution of Ca by Na+ ions causes a decrease in total exchange integral Aof the samples.
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