The effect of CaCO3-doping on the structural and dielectric properties of TiO2

The utilization of CaCO
₃
as a dopant to TiO
₂
is studied and its effects are compared to those of Al
₂
O
₃
and Li
₂
CO
₃
. The dielectric properties of the system have been exploited in the frequency range 1 MHz-1 GHz in order to obtain permittivity data of materials having high-κ' and low loss. The X-Ray Diffraction technique was employed for the evaluation of the anatase-to-rutile (A-R) phase transition in TiO
₂
nanoparticles during calcination. It is found that CaCO
₃
doping in TiO
₂
increases the anatase-to-rutile transition rate once the phase transformation has been initiated. This behaviour is similar to that of Al
₂
O
₃
and different to the one of Li
₂
CO
₃
, where phase transformation occurs at significantly lower temperatures. The formation of the complex oxide CaTiO
₃
is also recorded.