Nonlinear current-voltage and dielectric properties of CaCu3Ti4O12 ceramics prepared by an aloe vera solution method

บทคัดย่อ

Nonlinear current-voltage characteristic and dielectric properties of CaCu₃Ti₄O₁₂ (CCTO) ceramics prepared from CaCu₃Ti₄O₁₂ nanopowder obtained by the aloe vera solution method are investigated. The XRD results of CCTO nanopowder and CCTO ceramics indicated a perovskite structure with the observed impurity phases of CaTiO₃ and CuO in all samples. The maximum dielectric constant(') measured at 30 ºC and 1 kHz was found to be 1.10× 10⁴ with the minimum loss tangent (tan) of 0.07 for a CCTO ceramic sintered at 1050 ºC. Non-ohmic properties with a high breakdown field (E_b) of 2,215 V.cm-1 and a large nonlinear coefficient () of 19.31 were observed in a CCTO ceramic sample sintered at 1020 ºC. The dielectric, tan , and non-ohmic properties were found to be associated with the microstructure of the CaCu₃Ti₄O₁₂ ceramics.