Hall Coefficient of Tantalum Carbide as a Function of Carbon Content and Temperature

The Hall coefficient and the electrical resistivity of tantalum carbide were investigated along the entire cubic phase region at room temperature and at −196°C. At both temperatures the Hall coefficient was found to be negative and to decrease in magnitude with decreasing carbon content. Near the stoichiometric composition the magnitude of the Hall coefficient was lower at −196°C than at room temperature, but approached the room temperature value at about TaC0.8. The electrical resistivity increased with decreasing carbon content at both temperatures. The magnetoresistivity was too small to be detected.