Colossal permittivity behavior and its origin in rutile (Mg_1/3Ta_2/3)_xTi_1-xO₂.

ABSTRACT: This work investigates the synthesis, chemical composition, defect structures and associated dielectric properties of (Mg²⁺, Ta⁵⁺) co-doped rutile TiO₂ polycrystalline ceramics with nominal compositions of (Mg²⁺_1/3Ta⁵⁺_2/3) _x Ti_1-x O₂. Colossal permittivity (>7000) with a low dielectric loss (e.g. 0.002 at 1 kHz) across a broad frequency/temperature range can be achieved at x = 0.5% after careful optimization of process conditions. Both experimental and theoretical evidence indicates such a colossal permittivity and low dielectric loss intrinsically originate from the intragrain polarization that links to the electron-pinned [Formula: see text] defect clusters with a specific config

SUBMITTER: Dong W 

PROVIDER: S-EPMC5577065 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature