Effect of the Oxygen Content in a Salt Solution on the Characteristics of Sodium-Reduced-Tantalum Powders

摘要

The characteristics of the tantalum powders produced by sodium thermal reduction from salt melts based on K_2TaF_7 and NaCl with various amounts of added oxycompounds K_3TaOF_6 and K_2Ta_2O_3F_6 are studied. At a molar ratio of oxygen to tantalum of 1.25 in the initial melt, capacitor tantalum powders with a specific surface area more than 3 m~2/g are produced. The specific capacitance of the anodes made from these powders reaches 58 mC/g.