合成方法对Sr3−xLaxMn2O7微观结构的影响:HREM、EELS和x射线联合研究

M.T Caldes, G Goglio, C Marhic, O Joubert, M Lancin, L Brohan
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引用次数: 5

摘要

研究了Sr3−xLaxMn2O7系列(1≤x≤1.35)中生长缺陷类型与合成方法的关系。采用自燃法和陶瓷法制备样品。对于相同的Sr/La比,自燃法制备的样品中通常会观察到几种生长缺陷,而在陶瓷法制备的样品中,它们的存在是非常罕见的。随着La含量的增加,k2nif4型缺陷的数量减少。在二维相或缺陷上对mnl2,3边缘进行的EELS研究表明,样品中Mn3+/Mn4+的比例是均匀的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of synthesis method on the microstructure of Sr3−xLaxMn2O7: a combined HREM, EELS and X-ray study

The relationship between synthesis method and type of intergrowth defects observed in the Sr3−xLaxMn2O7 series (1≤x≤1.35) with nominal composition has been studied. Self-combustion and ceramic methods were used to prepare the samples. For the same Sr/La ratio, several kinds of intergrowth defects are usually observed in samples prepared by self-combustion, whereas in samples prepared by the ceramic method, their existence is quite unusual. Moreover, the number of K2NiF4-type defects decreases when the La content increases. An EELS study of Mn L2,3 edges, performed either on the 2D phase or on the defects, has shown a homogeneity of the samples with respect to the Mn3+/Mn4+ ratio.

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