Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 13, Pages 15110-15115Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.05.147
Keywords
Rutile TiO2; Hydrogen peroxide; Chemical oxidation; Colossal permittivity; Oxygen vacancy; Insulating layer
Categories
Funding
- National Natural Science Foundation of China [51572001, 11404002, 11404003]
- Weak Signal Detecting Materials and Devices Integration of Anhui University [Y01008411]
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Investigations on dielectric properties of N-2-sintered TiO2 ceramic samples followed by chemically oxidized in H2O2 aqueous solution with different time spans were performed in the frequency range of 10(2)-10(6) Hz. The results reveal that the dielectric properties strongly depend on the lengths of oxidizing time. An optimum oxidizing time of 12-16 h gives rise to superior dielectric properties with the permittivity of 12589 and the loss factor of 0.34 at 100 Hz. The time effect is attributed to the formation of an insulating layer at grain boundaries. Chemical oxidation proves to be a facile strategy to manipulate the insulating layer and opens a new way to modify the dielectric permittivity of versatile oxides.
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