Authors : Gadkari A. B., Shinde T. J. a nd Vasambekar P. N.
Page Nos : 248-251
Description :
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 La
3+
added cadmium ferrite is smaller than
Cadmium ferrite. FT
-
IR show two absorption band in high and low frequen
cy 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.
