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2014 | 125 | 2 | 214-216
Article title

Production of LaCaMnO_3 Composite by Ball Milling

Content
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Languages of publication
EN
Abstracts
EN
La_{0.67}Ca_{0.33}MnO_3 perovskite-type manganite was synthesized by high-energy ball milling raw oxides of La_2O_3 (purity 99.9%), CaCO_3 (purity > 99%), and MnO (purity > 99%). The ratio of ball and powder weight was 10:1 and the rotating speed was set to 500 rpm. X-ray analysis indicated that La_{0.67}Ca_{0.33}MnO_3 single phase was formed completely when milling time is up to 4 h. The peak intensity of perovskite structure decreased and a hump-like peak appeared with further milling time. When the milling time is longer than 40 h, the perovskite structure disappeared and the amorphous phase was formed completely. Scanning electron microscopy picture of 24 h milled sample showed that the particle size generally varies in a broad range from nanometer scale to a few μm. The magnetic measurements showed that ball milling samples have an inhomogeneous magnetic state and exhibit spin-glass like behavior. The significantly small magnetic entropy change and a remarkably broad temperature interval in entropy change were attributed to high degree of structural and magnetic disorder and broadening of magnetic transition.
Keywords
EN
Year
Volume
125
Issue
2
Pages
214-216
Physical description
Dates
published
2014-02
References
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv125n2015kz
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