Magnetic and fractal properties of nanocrystalline LaMnO(3) / Bogdanov SG,Valiev EZ,Pirogov AN,Teplykh AE,Ostroushko AA,Udilov AE // PHYSICS OF METALS AND METALLOGRAPHY. - 2001. - V. 91, l. 1. - P. S229-S233.

ISSN/EISSN:

0031-918X / нет данных

Type:

Article; Proceedings Paper

Abstract:

Nanocrystalline manganate LaMnO(3+delta) was synthesized by pyrolysis from polymer-salt compounds. It was annealed in air at different temperatures up to T(an) = 1100 degreesC for 4 h. For the purpose of controlling oxygen contents, samples were kept at the temperature of 600 degreesC for 20 h. The obtained samples were investigated by magnetic methods, X-ray and neutron diffraction, and by small-angle neutron scattering. The oxygen parameter delta is approximately 0.16 for the samples annealed at T(an) greater than or equal to 600 degreesC, and delta < 0.1 for the others. The former have a rhombohedral structure (space group R(3) over bar c) and the latter have an orthorhombic one (space group Pnma). From small-angle neutron scattering data, the particle size of the synthesized manganate is 24 nm. It increases with annealing and becomes more than 100 nm at T(an) = 1100 degreesC. All the investigated samples are ferromagnetic with the Curie point being 160-170 K. The synthesized manganate has surface fractal properties with fractal dimension D(S) = 2.6-2.2.

Author keywords:

GIANT MAGNETORESISTANCE; DEFECT STRUCTURE; FINE-PARTICLE; PEROVSKITES; TRANSPORT

DOI:

нет данных

Web of Science ID:

ISI:000172969500049

Соавторы в МНС:

Другие поля

Поле	Значение
Note	Eurasian Symposium on Trends in Magnetism (EASTMAG 2001), URAL CULTURAL CTR, EKATERINBURG, RUSSIA, FEB 27-MAR 02, 2001
Organization	Russian Fdn Basic Res; Russian Acad Sci, Ural Div; Russian Acad Sci, Inst Met Phys, Ural Div; Int Ctr Fundamental Phys; Nokocarbon, Ural Co; Spectrum Corp
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
Keywords-Plus	GIANT MAGNETORESISTANCE; DEFECT STRUCTURE; FINE-PARTICLE; PEROVSKITES; TRANSPORT
Research-Areas	Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Metallurgy \& Metallurgical Engineering
ResearcherID-Numbers	Bogdanov, Savva/K-1613-2013 valiev, eduard/J-9337-2013 Pirogov, Alexander/K-8115-2013
ORCID-Numbers	Bogdanov, Savva/0000-0003-2327-1180 valiev, eduard/0000-0002-0760-0370 Pirogov, Alexander/0000-0001-7321-1245
Number-of-Cited-References	15
Usage-Count-Since-2013	2
Journal-ISO	Phys. Metals Metallogr.
Doc-Delivery-Number	506KJ