首页|Modification of Cu-deficient CaCu2.8Ti4O12 ceramics via Mg2+ substitution at Cu sites for improved dielectric properties and thermal stability
Modification of Cu-deficient CaCu2.8Ti4O12 ceramics via Mg2+ substitution at Cu sites for improved dielectric properties and thermal stability
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NSTL
Elsevier
Mg2+ substitution at the Cu sites of Cu-deficient CaCu2.8-xMgxTi4O12 (x = 0.00, 0.05, and 0.10) ceramics was accomplished using a polymer pyrolysis technique. The nonlinear and dielectric properties of all ceramics under various sintering temperatures were investigated. Very low tanδ ～ 0.011–0.030 and giant ε′ ～ 4406–13,521 were obtained in these ceramics. Surprisingly, excellent thermal stability, where ε′ remained within± 15% and is adequate for X8R capacitors, is obtained in CaCu2.75Mg0.05Ti4O12 and CaCu2.7Mg0.1Ti4O12 ceramics sintered at 1100 °C for 8 h. Additionally, the nonlinear J-E properties were improved compared to an unmodified sample. Interestingly, a nonlinear coefficient (α) of ～ 58.05 in the CaCu2.75Mg0.05Ti4O12 ceramic sintered at 1100 °C for 8 h is acceptable for varistor applications. Improvement of nonlinear and dielectric properties arise from the electrical interface responses altered by Mg2+ substitution. The ceramics were characterized using XRD, TEM and FE-SEM techniques to investigate their crystal structure and microstructure. EDXS results confirmed the coexistence of TiO2 and CaTiO3 phases in all ceramics. It was suggested that the enhancement of grain boundary resistance (Rgb) with simultaneously improved electrical and nonlinear J-E behaviors caused by the alternation of electrical interface responses at GBs. XPS measurements of these ceramics presented Cu3+/Cu2+/Cu+ ratios that indicate the semiconducting properties of grains.
CaCu2.8-xMgxTi4O12 ceramicsMg2+ modificationNonlinear propertiesThermal stability of dielectric propertiesVery low-tanδ
Putjuso S.、Putjuso T.、Nijpanich S.、Swatsitang E.
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Giant Dielectric Materials Research and Development Unit (GDM-RDU) Department of Physics and Mathematics Faculty of Liberal Arts Rajamangala University of Technology Rattanakosin
Synchrotron Light Research Institute (Public Organization)
Institute of Nanomaterials Research and Innovation for Energy (IN-RIE) NANOTEC-KKU RNN on Nanomaterials Research and Innovation for Energy Khon Kaen University
NSTL
Elsevier
