Magnetic and dielectric properties of nanostructured BiFeO 3 prepared by sol-gel method

Shih Zong Lu, Xiao-Ding Qi

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

Polycrystalline BiFeO 3 was synthesized at 400°C-700°C. Distinctive difference in the magnetic and dielectric properties was observed between the samples sintered at 400°C-500°C and those sintered at 600°C-700°C. The former showed ferromagnetic-like hysteresis loops with an increased magnetization of 0.54 emu/g, whereas the later showed linear loops with a small magnetization of 0.065 emu/g. Although X-ray did not identify any secondary phase, the suspected trace of some magnetic phase (Fe 3 O 4 ) in the samples was conceded by the occurrence of an exchange bias. The difference in dielectric response between the two groups of samples arose mainly from a different conductivity at the grain boundaries. Owing to Fe 3 O 4 coating at grain surface, the 400°C-500°C sintered samples behaved like a single parallel R-C circuit, whereas the dielectric response of the samples sintered at 600°C-700°C was represented by a series of two parallel R-C units for grains and grain boundaries, respectively. Two dielectric relaxation peaks observed at <700 Hz and 0.3~6 MHz in the high-temperature sintered samples were attributed to the Maxwell-Wagner relaxation and electron hopping, respectively.

Original languageEnglish
Pages (from-to)2185-2194
Number of pages10
JournalJournal of the American Ceramic Society
Volume97
Issue number7
DOIs
Publication statusPublished - 2014 Jan 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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