期刊
MATERIALS RESEARCH BULLETIN
卷 116, 期 -, 页码 137-142出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2019.04.026
关键词
Nonlinear I-V behavior; Raman spectroscopy; Impedance spectroscopy; Colossal/giant dielectric material; TiO2
资金
- Synchrotron Light Research Institute
- Khon Kaen University
- Thailand Research Fund (TRF) [BRG6180003]
- Research and Technology Transfer Affairs of Khon Kaen University [KKUS(2561)-001]
- Thailand Graduate Institute of Science and Technology (TGIST) [SCA-CO-2558-1033-TH]
The nonlinear current-voltage and dielectric properties of (Al3+ + Ta5+) co-doped TiO2 (ATTO) ceramics are represented. Microstructural analysis reveals that sintered ceramics are highly dense and nonporous. ATTO ceramics exhibit low loss tangent (tan delta < 0.1) and large dielectric permittivity (epsilon(similar to)10(3)-10(4)). Furthermore, ATTO ceramics exhibited nonlinear current-voltage characteristics. The best dielectric properties are achieved in the (Al1/2Ta1/2)(0.05)Ti0.95O2 ceramic with a very low tan delta ((similar to)0.012) and high epsilon' ((similar to)10(4)) with excellent dielectric-temperature stability with a temperature coefficient at 150 degrees C as low as 2.69%. The resistivity of insulating phases decreases with increasing Al3+ and Ta5+ concentrations, which is correlated to decreased breakdown voltage. The nonlinear electrical properties and dielectric response are explained based on the electrical response of internal interfaces.
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