Magnetic and fractal properties of nanocrystalline LaMnO3 / Bogdanov S.G., Valiev E.Z., Pirogov A.N., Teplykh A.E., Ostroushko A.A., Udilov A.E. // Physics of Metals and Metallography. - 2001. - V. 91, l. 1 SUPPL.. - P. S229-S233.

ISSN:

0031918X

Type:

Article

Abstract:

Nanocrystalline manganate LaMnO3 + δ was synthesized by pyrolysis from polymer-salt compounds. It was annealed in air at different temperatures up to Tan= 1100°C for 4 h. For the purpose of controlling oxygen contents, samples were kept at the temperature of 600°C 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 δ is approximately 0.16 for the samples annealed at Tan ≥ 600°C, and δ < 0.1 for the others. The former have a rhombohedral structure (space group R3̄c) 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 Tan = 1100°C. All the investigated samples are ferromagnetic with the Curie point being 160-170 K. The synthesized manganate has surface fractal properties with fractal dimension Ds = 2.6-2.2.

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-0035564515&partnerID=40&md5=a2200ac8b3200aba7f5347f7e4c5274d
Affiliations	Institute of Metal Physics, ul. S. Kovalevskoi 18, Ekaterinburg, 620219, Russian Federation; Inst. of Phys. and Appl. Mathematics, Ural State University, Ekaterinburg, Russian Federation
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Correspondence Address	Bogdanov, S.G.; Institute of Metal Physics, ul. S. Kovalevskoi 18, Ekaterinburg, 620219, Russian Federation
Language of Original Document	English
Abbreviated Source Title	Phys. Met. Metallogr.
Source	Scopus