Dielectric Properties and Characterisation of Titanium Dioxide Obtained by Different Chemistry Methods

Table 1

Relative densities and dielectric properties of the TiO₂ pellets measured at 1.15 MHz and at temperature of 20°C. The titania pellets were additionally annealed for 2 hours at the same temperature as the temperature applied during annealing of powder.

Synthesis	Annealing temperature; of TiO2 powder; [°C]	Relative density [%]	Dielectric constant (𝜀)	tan(𝛿)	Temperature coefficient; [ppm/°C]
(1)	600(anatase)	61	18.9	0.130	—
(1)	850(rutile)	74	63.7	0.051	−579
(2)	900(anatase-rutile)	58	17.0	0.055	−68*
(3)	850(rutile)	59	23.0	0.032	—
(3)	900(rutile)	66	43.2	4⋅10^−4	−87

∗Value calculated in a temperature range from −140°C to −10°C.