Giant low frequency dielectric tunability in high-k Ba (Fe1/2 Nb1/2)O3 ceramics at room temperature

Shanming Ke, Haitao Huang

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The effect of electric field on the dielectric properties of high-k Ba (Fe1/2Nb1/2) O3ceramics with different grain sizes is reported. A low frequency giant dielectric tunability (>85%) can be obtained under a bias field as low as 50 V/mm. The results suggest that the giant dielectric tunability originates from extrinsic contributions such as domain boundary and oxygen defect relaxations. These findings provide a clear understanding to the complicated dielectric response in a family of high- k ceramics and a key to the high tunability of nonferroelectrics under low electric fields, which is attractive for potential applications in tunable devices.
Original languageEnglish
Article number064104
JournalJournal of Applied Physics
Issue number6
Publication statusPublished - 15 Sep 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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