Burns, Neel, and structural phase transitions in multiferoic Pb(Fe(2/3)W(1/3))O(3)-xPbTiO(3) detected by an acoustic emission

resumo

We investigated the ceramics samples of multiferoic solid solution of relaxor ferroelectric Pb(Fe(2/3)W(1/3))O(3) with ferroelectric PbTiO(3) (abbreviated as PFW-xPT; x=0, 0.25, and 0.37) by means of acoustic emission (AE) method and simultaneously using the dielectric measurement below 700 K. A distinct AE response has been detected at Burns temperature T(d)approximate to 640-650 K, where the dynamic polar clusters start to appear, at intermediate temperature of 510-520 K, where the polar clusters become probably static, at ferroelectric phase transition temperatures T(c), and at Neel antiferromagnetic phase transitions. The Neel temperatures T(N) in ceramics were observed to be lower than in the crystals; the origin is discussed. Based on detected AE responses, we have corrected previously obtained phase diagram for PFW-xPT system. (c) 2008 American Institute of Physics.

palavras-chave

RELAXOR FERROELECTRICS; SINGLE-CRYSTALS; CERAMICS; SYSTEM; BOUNDARY; RANGE

categoria

Physics

autores

Dul'kin, E; Mojaev, E; Roth, M; Kamba, S; Vilarinho, PM

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