Please use this identifier to cite or link to this item: http://elar.urfu.ru/handle/10995/92578
Title: Effects of long storage in La-Sr manganites with pared divalent and quadrivalent substituents for manganese
Authors: Karpasyuk, V. K.
Badelin, A. G.
Derzhavin, I. M.
Estemirova, S. K.
Merkulov, D. I.
Issue Date: 2019
Publisher: Institute of Physics Publishing
Citation: Effects of long storage in La-Sr manganites with pared divalent and quadrivalent substituents for manganese / V. K. Karpasyuk, A. G. Badelin, I. M. Derzhavin, S. K. Estemirova, et al.. — DOI 10.1088/1742-6596/1389/1/012047 // Journal of Physics: Conference Series. — 2019. — Vol. 1. — Iss. 1389. — 12047.
Abstract: The results of investigation on the ageing of ceramic manganites La1-cSrcMn0.90Ni0.05Ge0.05O3+γ and La1-cSrcMn0.90Zn0.05Ti0.05O3+γ (c = 0.15, 0.17, 0.19) during long-term storage at normal conditions are presented. Unit cell volume of all manganites having rhombohedral structure decreased over time. The width of X-ray diffraction reflexes from (Ni,Ge)-compositions varied irregularly within the measurement error, and the width of reflexes from (Zn,Ti)-contained manganites decreased significantly. Magnetization of all samples increased in the end of storage period. Curie point of compositions with c > 0.17 exhibited some trend of increase. Ageing leaded to the lowering of "metal-semiconductor" transition temperature in (Ni,Ge)-substituted manganites. (Zn,Ti)-contained compositions showed only semiconductor behavior in investigated temperature range from 100 to 300 K, and the changes of their magnetic parameters were most considerable. The increase in magnetization and Curie point reached 7.5 % and 11 %, respectively. Possible mechanisms of ageing in considered materials are discussed in terms of oxidation processes, formation of microinhomogeneities and relaxation of internal stresses. © Published under licence by IOP Publishing Ltd.
Keywords: BINARY ALLOYS
CURIE TEMPERATURE
INTERNAL OXIDATION
MAGNETIZATION
MANGANESE
MANGANITES
NEUROPHYSIOLOGY
STORAGE (MATERIALS)
STRONTIUM ALLOYS
LONG-TERM STORAGE
MAGNETIC PARAMETERS
METAL SEMICONDUCTORS
MICROINHOMOGENEITIES
OXIDATION PROCESS
POSSIBLE MECHANISMS
RHOMBOHEDRAL STRUCTURES
SEMICONDUCTOR BEHAVIOR
LANTHANUM ALLOYS
URI: http://elar.urfu.ru/handle/10995/92578
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85076616632
WOS ID: 000562319800047
PURE ID: 11769617
ISSN: 1742-6588
DOI: 10.1088/1742-6596/1389/1/012047
Appears in Collections:Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC

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