Journal of Northeastern University Natural Science ›› 2014, Vol. 35 ›› Issue (3): 366-368.DOI: 10.12068/j.issn.1005-3026.2014.03.014

• Materials & Metallurgy • Previous Articles     Next Articles

Characterization of the Microtwinning of Mn3O4 in La1xSrxMnO3 Compounds

SUN Benzhe, QI Yang   

  1. School of Sciences, Northeastern University, Shenyang 110819, China.
  • Received:2013-05-27 Revised:2013-05-27 Online:2014-03-15 Published:2013-11-22
  • Contact: QI Yang
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Abstract: La1xSrxMnO3 (LSMO) manganite has been widely focused on due to its significant colossal magnetoresistance (CMR) effect, but a trace of impurity Mn3O4 suppresses the CMR effect. The microtwinning in Mn3O4 phase was characterized and its formation mechanism was analyzed systematically by means of transmission electron microscopy and the relative analytical methods. It was found that twin plane is defined as (112) and a small amount of Sr atoms are observed near the twin plane in Mn3O4 with anatase structure.Based on the relationships between the probability of microtwinning and the number of Sr atoms, it can be verified that the formation of microtwinning may be attributed to the decrease in the formation energy of twin boundary induced by the introduction of Sr atoms, which contributes to deduce the general rule on the structural evolution from anatase to perovskite.

Key words: colossal magnetoresistance effect, transmission electron microscopy, microtwinning, twin plane, formation energy of twin boundary

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