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Giant dielectric permittivity observed in Li and Ti doped NiO | | Junbo Wu
; Ce-Wen Nan
; Yuanhua Lin
; Yuan Deng
; | | Date: |
18 Nov 2002 | | Journal: | Phys Rev Lett, 89 (21), 217601 | | Abstract: | A giant low-frequency dielectric constant ( epsilon 0 approximately 10(5)) near room temperature was observed in Li,Ti co-doped NiO ceramics. Unlike currently best-known high epsilon 0 ferroelectric-related materials, the doped oxide is a nonperovskite, lead-free, and nonferroelectric material. It is suggested that the giant dielectric constant response of the doped NiO could be enhanced by a grain boundary-layer mechanism as found in boundary-layer capacitors. In addition, there is about a one-hundred-fold drop in the dielectric constant at low temperature. This anomaly is attributed to a thermally excited relaxation process rather than a thermally driven phase transition, as for that yielding ferroelectrics. | | Source: | PubMed, pmid12443449 | | Services: | Forum | Review | Favorites | |
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