Influence of surface and finite size effects on the structural and magnetic properties of nanocrystalline lanthanum strontium perovskite manganites

0422242 - FZÚ 2014 RIV US eng J - Článek v odborném periodiku
Žvátora, P. - Veverka, Miroslav - Veverka, Pavel - Knížek, Karel - Závěta, Karel - Pollert, Emil - Král, V. - Goglio, G. - Duguet, E. - Kaman, Ondřej
Influence of surface and finite size effects on the structural and magnetic properties of nanocrystalline lanthanum strontium perovskite manganites.
Journal of Solid State Chemistry. Roč. 204, AUG (2013), s. 373-379. ISSN 0022-4596. E-ISSN 1095-726X
Grant CEP: GA ČR(CZ) GAP108/11/0807
Institucionální podpora: RVO:68378271
Klíčová slova: nanoparticles * manganese perovskites * Curie temperature
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 2.200, rok: 2013

Syntheses of nanocrystalline perovskite phases of the general formula La1-xSrxMnO3+δ were carried out employing sol–gel technique followed by thermal treatment at 700–900 °C under oxygen flow. The prepared samples exhibit a rhombohedral structure with space group R3c source in the whole investigated range of composition 0.20≤x≤0.45. The studies were aimed at the chemical composition including oxygen stoichiometry and extrinsic properties, i.e. size of the particles, both influencing the resulting structural and magnetic properties. The oxygen stoichiometry was determined by chemical analysis revealing oxygen excess in most of the studied phases. The excess was particularly high for the samples with the smallest crystallites (12–28 nm) while comparative bulk materials showed moderate non-stoichiometry.
Trvalý link: http://hdl.handle.net/11104/0228426