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Influence of oxygen non-stoichiometry on physical properties of NdSr_2mn_2O_(7±δ)

Journal of Rare Earths 2015年第3期33卷 282-288页

作者： a.m.yankin A.V.Fetisov O.m.Fedorova S.A.Uporov V.Ya.mitrofanov Laboratory of Static and Kinetics of Processes Institute of Metallurgy of Ural Branсh of Russian Academy of Science Amundsen St. 101 Ekaterinburg 620016 Russia

Nd Sr2mn2O7＋δ compounds were synthesized by ceramic method under three different cooling conditions. The Nd Sr2mn2O7＋δ samples were characterized by powder X-ray diffraction（XRD）. Oxygen non-stoichiometry data for the studied powders were determined by using gravimetric and X-ray photoelectron spectroscopy（XPS） methods. The correlation of cooling method and oxygen as non-stoichiometry was established. The electroconductivity in samples was studied by using four-point probe method, and the strong correlation with non-stoichiometry was found out. magnetization measurements were carried out. It was found that the magnetic and transport properties of the samples were also influenced by oxygen non-stoichiometry. The evolution of the magnetic properties could be explained by the formation of magnetic clusters in the vicinity of oxygen vacancies（OV） and strong competition between the superexchange and double exchange interactions.

关键词： oxygen stoichiometry gravimetric analysis electroconductivity magnetic properties rare earths

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Experimental study of shear properties of 3D woven composite using digital image correlation and acoustic emission

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Acta mechanica Sinica 2020年第2期36卷 448-459页

作者： E.m.Strungar A.S.yankin E.m.Zubova A.V.Babushkin A.N.Dushko Center of Experimental mechanics Perm National Research Polytechnic University614990 PermRussian Federation Engineering Center PJSC“UEC-Saturn” 152903 RybinskRussian Federation

This work is dedicated to the experimental study of the shear properties of three-dimensional reinforced composites taking into account their structural features,in Iosipescu *** strains have been determined using Vic-3D non-contact three-dimensional digital optical *** evolution of inhomogeneous strain fields on the surface of composite specimens of the structure under study has been *** variants of strain averaging in the specimen working area have been analyzed using Vic-3D ***-6 acoustic emission system has been used to assess the structural integrity of composite materials under loading.

关键词： Carbon-fiber composite 3D reinforced composite Digital image correlation Acoustic emission technique Iosipescu test

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