Bismuth Titanium Indium Antimony Oxide: A Low Temperature Coefficient, High K Dielectric Material

The 1 MHz dielectric properties for mixed phase polycrystalline ceramics of composition Bi sub 5 Ti sub 3 In sub x Sb x sub (1-x) O sub (15) are reported. In the vicinty of ambient temperature, the dielectric constants for the Sb and In end-members are approximately 430 and 160, respectively, and the temperature coefficients of dielectric constant (TCKs) are approximately -7600 and +430 ppm/degree. 

At an overall composition of Bi sub 5 Ti sub 3 In sub (0.37) Sb sub (0.63) O sub (15) a dielectric constant of 144 and a low TCK are found. Powder X- ray diffraction and electron microscopy analyses indicate that the optimal composition contains three major phases. Deviation of any of the elements from the above ratio leads to degradation of the properties.