Thermoelectric property studies on bulk TiO _x with x from 1 to 2

100% dense bulk Ti Ox samples have been made by first oxidizing TiO and then direct current induced hot press. It was found that the Seebeck coefficients are negative at room temperature and change to positive at higher temperature for 1<x<1.25, positive at room temperature and change to negative at higher temperature for 1.25<x<53, and always negative up to 800 °C for 53<x<2. The highest achieved dimensionless figure of merit is about 0.2-0.23 for 1.83<x<1.9, about eight times lower than the reported value.