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The nanocrystallite powders of La-Cd ferrites were synthesized by oxalate co-precipitation method. The structural analysis was done by XRD, SEM and FT-IR techniques. The X-ray diffraction study shows cubic spinel structure material with crystallite size of range of 28.86 to 30.40 nm. The grain size lies in the range of 0.67 to 1.2 μm. The grain size of La3+ added cadmium ferrite is smaller than Cadmium ferrite. FT-IR show two absorption band in high and low frequency region. The resistivity of the samples decreases with increase in percentage relative humidity (%RH). The decrease is found to be exponential for 40 to 80 %RH and linear for 80 to 90%RH. The samples are humidity sensitive at low humidity range of 40 to 80%RH. The sensitivity of La-Cd sensor is higher than Cd sensor. The response and recovery time of La-Cd sensor shorter than Cd sensor.

EFFECT OF RARE EARTH IONS ( La 3 + ) ON HUMIDITY SENSIN G CHARACTERISTICS CADM IUM FERRITES