Preparation of NdMn.sub.1−x./sub.Fe.sub.x./sub.O.sub.3+δ./sub. single crystals - Effect of preparation atmosphere and iron doping

0432668 - FZÚ 2015 RIV NL eng J - Journal Article
Mihalik, M. - Mat`aš, S. - Vávra, M. - Briančin, J. - Mihalík, M. - Fitta, M. - Kavečanský, V. - Kopeček, Jaromír
Preparation of NdMn_1−xFe_xO_3+δ single crystals - Effect of preparation atmosphere and iron doping.
Journal of Crystal Growth. Roč. 401, SEP (2014), s. 605-607. ISSN 0022-0248. E-ISSN 1873-5002
Grant - others:European Commission under the 7th Framework Programme(XE) NMI3-II 283883; ERDF EU(XE) ITMS26220120047
Institutional support: RVO:68378271
Keywords : doping * floating zone technique * manganites * rare earthc ompounds
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.698, year: 2014

We present the study of the effect of crystal growth atmosphere (argon or air) and chemical doping (iron) on the quality and oxygen nonstoichiometry of the single crystals with the general formula NdMn1−xFexO3+δNdMn1−xFexO3+δ, which were grown by the optical floating zone method. The analysis of the grown ingots showed that in the Ar atmosphere the losses of the oxygen lead to MnO impurities, but in the air atmosphere some Mn3+ ions are replaced by Mn4+ ions (thence we have observed positive δ ). The X-ray Laue diffraction and polarized light microscopy revealed that the twinning of the grown ingots is the common phenomenon. This twinning can be explained by the fact that a/c~1a/c~1. Neutron diffraction experiment revealed that the preferential growing directions of the compound are (101) and (010).
Permanent Link: http://hdl.handle.net/11104/0237042