Investigation of the dielectric properties of MnO-additive Pb(Fe2/3W1/3)-PbTiO3 relaxors prepared by two different methods

• Published in: Journal of alloys and compounds Vol. 460; no. 1-2; pp. 658 - 667
• Main Authors: HONG, Cheng-Shong, CHU, Sheng-Yuan, SU, Wen-Chang, CHANG, Ren-Chuan, NIEN, Hsiau-Hsian, JUANG, Yung-Der
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier 28.07.2008
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectric loss and relaxation; Dielectric properties of solids and liquids; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Permittivity (dielectric function); Physics; PFW; Scanning electron microscopy; Spin glasses; Mn; Landau theory; Dielectric properties; Lead titanates; Curie-Weiss law; XRD; Relaxor; Low field; Relaxors; Iron Lead Tungstates Mixed; Ferroelectric; Synthesis; Dielectric losses; Ordering; Dopants; Permittivity; Synthesized method
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2007.06.068

In this paper, 0.75Pb(Fe2/3W1/3)O3-0.25PbTiO3-0.15 wt% MnO (0.75PFW-0.25PT-0.15 wt% MnO) ceramics are synthesized by two different methods, the conventional direct oxide synthesized (DS) method and two-step indirect synthesized (IS) method. The low-field dielectric responses are investigated by using the empirical law, the Curie-Weiss law, the modified-Landau theory and the spin-glass model. Due to the IS method, the lattice structure and the grain structure of the samples are changed. Furthermore, the dielectric properties are evidently modified. It is suggested that the ordering degree of B-site cations is enhanced by using the IS synthesized method.