Mixed Li-Cd ferrites having the chemical formula Li0.5-x/2CdxFe2.5-x/2
O4 (where x = 0.2, 0.4, 0.6, 0.8, and 1.0) are prepared by the well-kn
own double sintering ceramic technique. From x-ray diffraction studies
lattice parameters are calculated and their variation with compositio
n is explained on the basis of the tetrahedral ionic radius. The bulk
density of the specimens are determined by the hydrostatic method and
the percentage porosity was calculated. The ultrasonic compressional (
V1) and shear (V(s)) velocities of mixed Li-Cd ferrites are measured a
t room temperature by the ultrasonic pulse transmission technique. The
values of Young's modulus, the rigidity modulus, Debye temperatures,
and average sound velocities are calculated from the experimental valu
es of V1 and V(s). The elastic moduli have been corrected to zero poro
sity. The variation of elastic moduli with composition is interpreted
in terms of binding forces between the atoms.