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Structure and magnetic properties of 4H-SrMnO3-δ(δ=0.0 and 0.18) nanoparticles synthesized by thermal decomposition of appropriate precursor

Published online by Cambridge University Press:  23 May 2014

M. Parras ,
I. N. González-Jiménez ,
A. Torres-Pardo ,
A. E. Sánchez-Pelaez ,
A. Gutiérrez ,
M. García-Hernández ,
J. M. González-Calbet  and
A. Varela
M. Parras
Affiliation:
Departamento de Química Inorgánica, Facultad de CC. Químicas, Universidad Complutense de Madrid, 28040 Madrid (SPAIN).
I. N. González-Jiménez
Affiliation:
Departamento de Química Inorgánica, Facultad de CC. Químicas, Universidad Complutense de Madrid, 28040 Madrid (SPAIN).
A. Torres-Pardo
Affiliation:
Departamento de Química Inorgánica, Facultad de CC. Químicas, Universidad Complutense de Madrid, 28040 Madrid (SPAIN).
A. E. Sánchez-Pelaez
Affiliation:
Departamento de Química Inorgánica, Facultad de CC. Químicas, Universidad Complutense de Madrid, 28040 Madrid (SPAIN).
A. Gutiérrez
Affiliation:
Departamento de Química Inorgánica, Facultad de CC. Químicas, Universidad Complutense de Madrid, 28040 Madrid (SPAIN).
M. García-Hernández
Affiliation:
Instituto de Ciencia de Materiales, CSIC, Cantoblanco, 28049 Madrid (SPAIN).
J. M. González-Calbet
Affiliation:
Departamento de Química Inorgánica, Facultad de CC. Químicas, Universidad Complutense de Madrid, 28040 Madrid (SPAIN).
A. Varela
Affiliation:
Departamento de Química Inorgánica, Facultad de CC. Químicas, Universidad Complutense de Madrid, 28040 Madrid (SPAIN).
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Abstract

Stoichiometric 4H-SrMnO3.0 nanoparticles have been successfully synthesized for the first time from thermal decomposition of a new heterometallic precursor [SrMn(edta)(H2O)5]·3/2H2O. From this precursor, highly homogeneous 4H-SrMnO3.0 nanoparticles with average particle size 70 nm are obtained. Local structural information, provided by atomically-resolved microscopy techniques, shows that 4H-SrMnO3.0 nanoparticles exhibit the same general structural features than the bulk material, although structural disorder, due to edge-dislocations, is observed. The nanometric size of particles enables a topotactic reduction process at low temperature stabilizing a metastable 4H-SrMnO2.82 phase. The oxygen deficiency is accommodated through extra cubic layers breaking the …hchc… 4H-sequence. These defect areas are Mn3+ rich as evidenced by high energy resolution EELS data. Magnetic characterization of nano-4H-SrMnO3-δ shows significant variations with respect to the bulk material.

Keywords

nanoscalemicrostructuremagnetic properties
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1708: Symposium VV – Designed Cellular Materials–Synthesis, Modeling, Analysis and Applications , 2014 , mrss14-1708-vv04-07
Copyright
Copyright © Materials Research Society 2014 

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References

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