Abstract

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 R_RT of the produced CuFe₂O₄ ceramics namely B = 2215-2807^oK and r_RT = 6,9-16,7 M Ohm, fitted market requirement.

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