TITLE

Dielectric relaxations and dielectric response in multiferroic BiFeO3 ceramics

AUTHOR(S)

Hunpratub, Sitchai; Thongbai, Prasit; Yamwong, Teerapon; Yimnirun, Rattikorn; Maensiri, Santi

PUB. DATE

February 2009

SOURCE

Applied Physics Letters;2/9/2009, Vol. 94 Issue 6, pN.PAG

SOURCE TYPE

Academic Journal

DOC. TYPE

Article

ABSTRACT

Single-phase multiferroic BiFeO3 ceramics were fabricated using pure precipitation-prepared BiFeO3 powder. Dielectric response of BiFeO3 ceramics was investigated over a wide range of temperature and frequency. Our results reveal that the BiFeO3 ceramic sintered at 700 °C exhibited high dielectric permittivity, and three dielectric relaxations were observed. A Debye-type dielectric relaxation at low temperatures (-50 to 20 °C) is attributed to the carrier hopping process between Fe2+ and Fe3+. The other two dielectric relaxations at the temperature ranges 30–130 °C and 140–200 °C could be due to the grain boundary effect and the defect ordering and/or the conductivity, respectively.

ACCESSION #

36609488

 

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