Patent ID: 7679885

Claim:
A tantalum powder, wherein when said tantalum powder is formed into an electrolytic capacitor anode, said anode has a capacitance of from 450,000 to 800,000 μFV/g, and is measured by pressing tantalum powder into pellets with tantalum lead wires, with a press density of 4.5 g/cm 3 , sintering said pellets, anodizing said sintered pellets in a phosphoric acid aqueous solution having a concentration of 0.1 vol. % under a voltage of 6V and a current of 90 mA/g to form anodized pellets and testing capacitance in a sulfuric acid aqueous solution having a concentration of 30.5 vol. % at a temperature of 25° C. under a frequency of 120 Hz and a voltage of 1.5V.