Tantalum powder for capacitors
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United States of America Patent
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Feb 10, 2004
Grant Date -
May 2, 2002
app pub date -
Aug 10, 2001
filing date -
Feb 3, 1999
priority date (Note) -
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Abstract
The tantalum powder for capacitors of the present invention has a specific surface area S.sub.B as determined by the BET method of 1.3 m.sup.2 /g or more, and an S.sub.B /S.sub.F ratio between the specific surface area S.sub.B as determined by the BET method and the specific surface area S.sub.F determined by the FSS method of 4 to 10. This tantalum powder not only has a large specific surface area S.sub.B, but also has suitable cohesive strength and uniform porosity. Consequently, a solid state electrolytic capacitor having high capacitance and low ESR can be obtained by providing with a capacitor anode formed from a sintered body of this tantalum powder. In addition, whether or not this tantalum powder is suitable for the production of a tantalum capacitor having high capacitance and low ESR can be determined easily and reliably by evaluating the tantalum powder using the specific surface area S.sub.B as determined by the BET method and the S.sub.B /S.sub.F ratio between S.sub.B and the specific surface area S.sub.F determined by the FSS method.
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