Authors : Ashok B. Gadkari, T. J. Shinde and P. N. Vasambekar
Page Nos : 214-216
Description :
The nanocrystallite powders of Sm-Cd ferrites were prepared by oxalate co-precipitation method. The structural analysis was done by XRD, SEM and FT-IR techniques. The X-ray diffraction study reveals the nanostructure material with crystallite size of range of 29.56 to 30.40nm. The grain size obtained from SEM study is in the range of 0.7 to 1.2µm. The grain size of Sm3+ 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. All the samples are humidity sensitive at low humidity range of 40 to 80%RH. The sensitivity of Sm-Cd sensor is higher than Cd sensor. The response and recovery time of Sm-Cd sensor shorter than Cd sensor.
Keywords: Cd ferrites; Grain size; Humidity sensitivity; Response time.
