High hydrostatic pressure effect on functional properties of nanopowder La0.6Sr0.3Mn1.1O3-δ compacts with various dispersion

2017 IEEE 37th International Conference on Electronics and Nanotechnology (ELNANO) Pub Date : 2017-04-01 DOI:10.1109/ELNANO.2017.7939718

N. Liedienov, A. Pashchenko, V. Pashchenko, D. Tatarchuk, Yu. S. Prilipko, Y. Didenko, V. Turchenko, V. Prokopenko, A. Voznyak, I. Fesych

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引用次数: 1

Abstract

Nanopowder La0.6Sr0.3Mn1.1O3−δ compacts by the oxide-salt, co-precipitation and atomization hydrolysis technologies have been obtained. Structure and its defects, average particle size and functional properties of the nanopowder compacts by X-ray diffraction, thermogravimetric, resistance, magnetic, ⁵⁵Mn NMR, magnetoresistance and BET methods have been investigated. Connections between the dispersion of nanopowders and their structural, magnetic, resistance, magnetoresistance and baroresistance properties have been established. Broad and asymmetric ⁵⁵Mn NMR spectra testify the high-frequency electron double exchange Mn³⁺↔O²⁻↔Mn⁴⁺ and indicate inhomogeneous environment of Mn by other ions and vacancies. The increase in high hydrostatic pressure up to 1.6 GPa leads to decrease in resistivity and activation energy as well as raise in density, coercive force, magnetoresistance and baroresistance effects of the nanopowder compacts.

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高静水压力对不同分散度la0.6 sr0.3 mn1.103 -δ纳米粉体功能性能的影响

采用氧化盐、共沉淀法和雾化水解法制备了la0.6 sr0.3 mn1.103−δ纳米粉体。采用x射线衍射、热重、电阻、磁、55Mn NMR、磁电阻和BET等方法对纳米粉末压实物的结构、缺陷、平均粒径和功能特性进行了研究。建立了纳米粉体的分散性与其结构、磁性、电阻、磁阻和耐压性能之间的联系。广泛和不对称的55Mn核磁共振波谱证明了高频电子双交换Mn3+↔O2−↔Mn4+，并表明Mn受其他离子和空位的不均匀环境。当静水高压达到1.6 GPa时，纳米粉末压块的电阻率和活化能降低，密度、矫顽力、磁阻和压阻效应均有所提高。

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2017 IEEE 37th International Conference on Electronics and Nanotechnology (ELNANO)

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