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Journal
2009 | 7 | 1 | 89-95
Article title

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

Content
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Languages of publication
EN
Abstracts
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.
Publisher
Journal
Year
Volume
7
Issue
1
Pages
89-95
Physical description
Dates
published
1 - 3 - 2009
online
8 - 1 - 2009
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.-psjd-doi-10_2478_s11534-008-0147-5
Identifiers
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