Journal article
Observation of high permittivity in Ho substituted BaZr0.1Ti0.9O3 ceramics
The authors observed an extremely high permittivity (∼35000 at TC) in barium zirconate titanate (BaZr0.1Ti0.9O3) ceramics with holmium substitution (1–5mol%) in Ba site. Careful microstructural investigation and energy dispersive spectroscopy analysis of the 1–2mol% of Ho substituted ceramics showed the enrichment of a Ho-phase along the grain boundaries with a composition close to the Ho2Ti2O7 pyrochlore.
The formation of Ho rich phase resulted in the Maxwell-Wagner polarization mechanism, which leads to this unusually high permittivity. Ceramics with 3mol% or higher Ho content showed lesser permittivity values compared to 1–2mol%, probably due to the increase in pyrochlore phase. These high dielectric constant ceramics are useful in nanoscale devices.
Language: | Undetermined |
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Publisher: | American Institute of Physics |
Year: | 2007 |
ISSN: | 10773118 and 00036951 |
Types: | Journal article |
DOI: | 10.1063/1.2755932 |