| 摘要 |
A decoupling capacitor connected to a power source for reducing power source noise. The capacitor has a dielectric thin film 8 , the dielectric thin film 8 is comprised of a bismuth layer structured compound with ac axis oriented substantially perpendicularly to the plane of a thin film forming substrate, the bismuth layer structured compound is expressed by the formula (Bi<SUB>2</SUB>O<SUB>2</SUB>)<SUP>2+</SUP>(A<SUB>m-1</SUB>B<SUB>m</SUB>O<SUB>3m+1</SUB>)<SUP>2-</SUP> or Bi<SUB>2</SUB>A<SUB>m-1</SUB>B<SUB>m</SUB>O<SUB>3m+3</SUB>, the symbol m in said formula is a positive number, the symbol A is at least one element selected from Na, K, Pb, Ba, Sr, Ca, and Bi, and the symbol B is at least one element selected from Fe, Co, Cr, Ga, Ti, Nb, Ta, Sb, V, Mo, and W |
