Fe3+/Nb5+ co-doping effects on the properties of Aurivillius Bi4Ti3O12 ceramics

JOURNAL OF ALLOYS AND COMPOUNDS

卷:731

Article

Lavado, C.¹  Stachiotti, M. G.¹ 

[1] Univ Nacl Rosario, Inst Fis Rosario, 27 Febrero 210 Bis, RA-2000 Rosario, Santa Fe, Argentina

关键词: Ferroelectrics;    Ceramics;    Solid state reaction;    Dielectric response;   

DOI  :  10.1016/j.jallcom.2017.10.112

来源: Elsevier

【 摘 要 】

Bi4Ti3-x(Nb0.5Fe0.5)xO(12) (BTFNx) ceramics with 0 <= x <= 2 were synthesized to evaluate the effect of Fe3+/Nb5+ co-substitution into the B-site of Bi4Ti3O12 (BIT). We show that the XRD pattern for the compounds with x <= 1 is the characteristic one of a layered perovskite structure belonging to the n = 3 member of the Aurivillius family. Impurity peaks assigned to a pyrochlore phase are detected at higher concentrations. Raman measurements corroborated that Fe3+ and Nb5+ ions are incorporated into the Ti sites of the Aurivillius compound. Frequency dependent dielectric studies at room-temperature displayed the reduction of both dielectric constant and loss tangent with substitution, while the electric-field-induced polarization switching behavior indicates ferroelectric character. It is observed that the ferroelectric transition temperature decreases with increasing Fe/Nb content. Magnetic measurements indicated no evidence of ferromagnetic ordering, but antiferromagnetic spin correlations between Fe3+ ions. (C) 2017 Elsevier B.V. All rights reserved.

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