Non-symmetric superparamagnetic clusters in the relaxor manganites Sr2−xBixMnTiO6 (0 ≤ x ≤ 0.75)

Inmaculada Álvarez-Serrano; M. Luisa López; Fausto Rubio; Mar García-Hernández; Gabriel J. Cuello; Carlos Pico; M. Luisa Veiga

doi:10.1039/C2JM30670K

Non-symmetric superparamagnetic clusters in the relaxor manganites Sr_2−xBi_xMnTiO₆ (0 ≤ x ≤ 0.75)†

Inmaculada Álvarez-Serrano,*^a M. Luisa López,^a Fausto Rubio,^b Mar García-Hernández,^c Gabriel J. Cuello,^d Carlos Pico^a and M. Luisa Veiga^a

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* Corresponding authors

^a Dpto. Química Inorgánica I, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain
E-mail: ias@quim.ucm.es
Fax: +34 913944352
Tel: +34 913945237

^b Instituto de Cerámica y Vidrio, CSIC, Cantoblanco, 28049 Madrid, Spain
E-mail: frubio@icv.csic.es
Fax: +34917355843
Tel: +34917355840

^c Instituto de Ciencia de Materiales, CSIC, Cantoblanco, 28049 Madrid, Spain
E-mail: marmar@icmm.csic.es
Fax: +34 91 372 0623
Tel: +34 91 334 9000

^d Institut Laue-Langevin, 6 rue Jules Horowitz, F-38042 Grenoble, France
E-mail: cuello@ill.eu

Abstract

The structural, microstructural, electrical and magnetic characterization of microcrystalline powders of new Ti manganites Sr_2−xBi_xMnTiO₆ (0 ≤ x ≤ 0.75) is reported. Compositional characterization by means of EDS and XPS confirms the stoichiometry of all samples to be practically equal to the nominal ones. Neutron and X-ray diffraction data show that all the samples crystallize with cubic symmetry, space group Pm [3 with combining macron] m, which is broken at the nanoscale as Raman spectroscopy and HRTEM/ED analysis suggest. The complex magnetic response is interpreted by considering the magnetic frustration derived from the presence of structural and atomic disorder; initial AFM behavior evolves to FM predominant interactions as x increases and superparamagnetic clusters stabilize above T_c. The variation of the permittivity with temperature for x ≥ 0.50, obtained from impedance measurements, seems to be related to a relaxor-type ferroelectric behaviour. The title materials could be regarded as a potential local multiferroic system, given that both the FE and FM responses seem to be dependent on the formation and development of BiMO₃-type clusters, and therefore they are correlated.

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Article information

DOI: https://doi.org/10.1039/C2JM30670K
Article type: Paper
Submitted: 03 Feb 2012
Accepted: 23 Apr 2012
First published: 24 Apr 2012

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J. Mater. Chem., 2012,22, 11826-11835

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Non-symmetric superparamagnetic clusters in the relaxor manganites Sr_2−xBi_xMnTiO₆ (0 ≤ x ≤ 0.75)

I. Álvarez-Serrano, M. L. López, F. Rubio, M. García-Hernández, G. J. Cuello, C. Pico and M. Luisa Veiga, J. Mater. Chem., 2012, 22, 11826 DOI: 10.1039/C2JM30670K

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