  Our purpose is to study role of ionic radii of non-magnetic dopants; Li+
(0.68 {\AA}), Mg2+ (0.72 {\AA}) and K+ (1.38 {\AA}) on the magnetic property of
rutile TiO2 compound. The Ti0.94A0.06O2 (A=Li, Mg, K) compounds have been
synthesized via solid state route method at equilibrium. The structural
analyses of X-ray diffraction pattern reveals that the doping of Li and Mg lead
to Ti site substitution and K doping lead to core shell kind of structure. The
magnetic property measurement by SQUID magnetometer indicate that all compounds
exhibit weak paramagnetism with highest paramagnetic moment of ~ 0.3 MuB / ion
for K doped compound but no long-range ferromagnetic ordering. We have
discussed the observed magnetism in correlation with the nature of
substitution.
