Electrical Characteristics Cufe2o4 Thick Film Ceramics with Different Glass Concentrations Fired at 1000 °C for Negative Thermal Coefficient (Ntc) Thermistor

Fabrication of CuFe2O4 thick film ceramics utilizing Fe2O3 derived from yarosite using screen printing technique for NTC thermistor has been carried out. Effect of glass frit addition (0, 2.5, 5 weight %) has been studied. X-ray diffraction analyses (XRD) was done to know crystal structure and phases formation. SEM analyses were carried out to know microstructure of the films. Electrical properties characterization was done through measurement of electrical resistance at various temperatures (room temperature to 100°C). The XRD data showed that the films crystalize in tetragonal spinel. The SEM images showed that glass frit addition made the grain size smaller. Electrical data showed that the larger the glass frit concentration, the larger the resistance, thermistor constant and sensitivity. From the electrical characteristics data, it was known that the electrical characteristics of the CuFe2O4 thick film ceramics followed the NTC characteristic. The value of B and RRT of the produced CuFe2O4 ceramics namely B = 2215-2807oK and rRT = 6,9-16,7 M Ohm, fitted market requirement.