La{sub 0.7}Sr{sub 0.3}MnO{sub 3} nanopowders: Synthesis of different powders structures and real magnetic properties of nanomanganites

Journal Article · Thu Aug 15 04:00:00 EDT 2013 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2013.05.012· OSTI ID:22285072

Danilenko, Igor; Konstantinova, Tetyana; Volkova, Galina; Glazunova, Valentina

The difference in the magnetic properties between two lanthanum manganite nanopowders with identical phase and chemical composition is discussed in terms of the influence of nanopowder synthesis conditions on their properties. The aim of this investigation was to show the influence of precursor type and structure on the structure and properties of final La{sub 0.7}Sr{sub 0.3}MnO{sub 3} nanopowders obtained by precipitation technique. The forming of a complex structure of precursor materials during drying and inheritance at firing stage led to the formation of bimodal particle size distribution and magnetic properties typical of coarse powders. The correct choice of precursor material and the technological conditions of the drying and firing stage were allowed for the creation of a uniform powder structure with special magnetic properties. We showed that the magnetic properties of nanopowders were not always determined by chemical or phase composition and mean particle size of synthesized powders. The difference in precipitation process can lead to unpredictable and catastrophic results, and masked the effect of nanoparticles on the magnetic properties of the material. - Highlights: • Precursor’s structure has a strong influence on LSM nanoparticles structure. • Amorphous precursor structure led to uniform LSM nanoparticles formation. • Crystal precursors led to the formation of bimodal LSM particles distribution. • Decrease the single-domain LSM NP size led to decrease the powder’s magnetization.

• OSTI ID: 22285072
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 82; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL COMPOSITION
LANTHANUM
MAGNETIC PROPERTIES
MATERIALS
NANOSTRUCTURES
OXIDES
PARTICLE SIZE
PARTICLES
POWDERS
PRECURSOR
SYNTHESIS