Grain size and interfacial interdiffusion influence on the magnetic and dielectric properties of magnetoelectric La0.7Ba0.3MnO3-BaTiO3 composites

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:407

Article

Clabel H, J. L.¹  Ferri, F. A.²  Zabotto, F. L.²  Rivera, V. A. G.³  Nogueira, I. C.⁴  Garcia, D.²  de Lima, O. F.⁵  Leite, E. R.⁶  Pereira-da-Silva, M. A.^1,7  Cardoso, C. A.² 

[1] Univ Sao Paulo, Inst Phys Sao Carlos, Sao Carlos, SP, Brazil

[2] Univ Fed Sao Carlos, Dept Phys, BR-13560 Sao Carlos, SP, Brazil

[3] Univ Nacl Federico Villarreal, Escuela Fis, Lima, Peru

[4] Inst Fed Maranhao, PPG Engn Mat, Sao Luis, MA, Brazil

[5] Univ Estadual Campinas, Inst Phys Gleb Wataghin, Campinas, SP, Brazil

[6] Univ Fed Sao Carlos, Dept Chem, BR-13560 Sao Carlos, SP, Brazil

[7] UNICEP, Paulista Cent Univ Ctr, Sao Carlos, SP, Brazil

关键词: Dielectric properties;    Magnetic properties;    Laminated composite;    Magnetoelectric coupling;   

DOI  :  10.1016/j.jmmm.2016.01.082

来源: Elsevier

【 摘 要 】

We report on specific features of the dielectric and magnetic properties as well as magnetoelectric coupling coefficients (alpha(ME)) of the La0.7Ba0.3MnO3 (L)-BaTiO3 (B) 2-2 type ceramic composite. The powder of L and B was synthesized by two different methods (solid state reaction and Pechini). Orthorhombic and tetragonal phases were observed for the separated phases L and B of the composite, respectively, for both synthesis methods. The characteristics of grain size and interfacial interdiffusion in the L-B-L composite obtained for different synthesis method were studied, showing that diffusion was a typically physical migration, which can be mainly controlled by the grain size. Anomalies in the observed dielectric behavior are attributed to the internal residual stresses and chemically inhomogeneous regions. The existence of a broad magnetic transition observed in the pure L phase and laminated L-B-L composite was also attributed to its small grain size. A comparison of the maximum transversal (alpha(ME)(31)) and longitudinal (alpha(ME)(33)) ME coupling coefficients, at room temperature, is also shown. (C) 2016 Elsevier B.V. All rights reserved.

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