Structure, Morphology, and Resistance Properties of Non-Stoichiometric Sodium Manganite Nanoparticles with Superstoichiometric Manganese
2022 IEEE 41st International Conference on Electronics and Nanotechnology (ELNANO)(2022)
摘要
Structure, morphology, chemical and phase composition, as well as transport of the manganite
$\text{La}_{0.8-x}\text{Na}_{0.2}\text{Mn}_{1+x}\mathrm{O}_{3}$
nanoparticles have been studied by means of X-ray diffraction, high-resolution transmission electron microscopy, transmission electron microscopy, and resistance methods. The samples have been synthesized using a sol-gel method at
$850\ ^{0}\mathrm{C}$
(20 h) in an air atmosphere. According to the X-ray diffraction and transmission electron microscopy data, the average size of spherical-like nanoparticles is in the range of 48–73 nm. Rietveld refinement of X-ray data indicates a slight decrease in the volume of a rhombohedral
$R$
-3
$c$
perovskite structure for all compositions with an increase in the
$x$
. Based on the analysis of resistance data, the metal-semiconductor phase transition has been detected at a temperature of
$T_{\text{ms}}$
, which reduces with increasing the
$x$
. The temperature dependence of resistivity has been fitted successfully by the different models within a large temperature region from 2K to 360K. The transport parameters have been obtained.
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关键词
manganite,nanopowder,morphology,chemical defects,resistance
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