Microstructure of La_(1-x)Ca_xMnO_3 studied by transmission electron microscopy

Q. Chen; J. Tao; J.M. Zuo

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Microstructure of La_(1-x)Ca_xMnO_3 studied by transmission electron microscopy

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Microstructures of La_(1-x)Ca_xMnO_3 compounds (x = (1/3) and 0.5) prepared with and without intermediate grinding were studied using transmission electron microscopy. A high density of antiphase boundaries (APBs) with displacement vector (1/2) , indexed in orthorhombic unit cell, has been observed in hulk samples with no or minimum intermediate grinding. The nature of this APB is analyzed and found to be due to the symmetry breaking introduced by the tilting of MnO_6 octahedra relative to the ideal perovskite structure. Samples prepared using two intermediate grinds do not show these defects indicating that the microstructure can be controlled through synthesis routes. The effect of domain boundaries on the colossal magnetoresistance effect is discussed.

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《Journal of Materials Research》 |2001年第10期|2959-2965|共7页
作者
Q. Chen; J. Tao; J.M. Zuo;
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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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正文语种英语
中图分类工程材料学;
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Microstructure of La_(1-x)Ca_xMnO_3 studied by transmission electron microscopy

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