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Structural, magnetic, and electrical features of the Nd 2 SrMn 2 TiO 9 perovskite‐like compound
Author(s) -
Cuervo Farfán J. A.,
Castellanos Acuña H. E.,
Landínez Téllez D. A.,
Parra Vargas C. A.,
RoaRojas J.
Publication year - 2016
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201552596
Subject(s) - rietveld refinement , materials science , lattice constant , crystallite , orthorhombic crystal system , dielectric , magnetization , curie temperature , perovskite (structure) , ferromagnetism , analytical chemistry (journal) , condensed matter physics , powder diffraction , diffraction , crystallography , crystal structure , chemistry , magnetic field , optics , physics , optoelectronics , chromatography , quantum mechanics , metallurgy
The synthesis process of the polycrystalline ceramic compound Nd 2 SrMn 2 TiO 9 by means of the solid‐state reaction procedure is reported. The crystalline structure was analyzed through X‐ray diffraction experiments in the Bragg–Brentano recipe. The Rietveld refinement of the diffraction pattern by using the GSAS code shows that this material crystallizes in an orthorhombic structure, space group Pnma (#62), with lattice parameters a = 5.4764(6) Ǻ, b = 7.7468(6) Ǻ, and 5.4810(6) Ǻ. The surface morphology was studied by scanning electron microscopy images, which evidence the formation and compacting of grain with mean size 352.63 nm. Semiquantitative compositional analysis performed by means of Energy Dispersive X‐ray Spectroscopy shows the stoichiometric composition of the samples. Measurements of magnetization as a function of temperature reveal that this compound has a ferromagnetic behavior. The analysis with the Curie equation permitted to establish an effective magnetic moment μ eff = 4.33 μ B , which is 95.7% in agreement with the theoretical value expected from the Hund's rules. Measurements of DC resistivity as a function of temperature show a conductor behavior below the Curie temperature and insulator above. Evidences of a nonlinear response as a function of frequency with high values of relative dielectric constant reveal the occurrence of giant dielectric constant with ϵ r = 6480 for ν = 100 Hz.