Patent ID: 7312514

Claim:
A high-permittivity insulation film, comprising at least a first bismuth layer-structured compound layer expressed by a composition formula of (Bi 2 O 2 ) 2+ (A m−1 B m O 3m+1 ) 2− or Bi 2 A m−1 B m O 3m+3 , wherein “m” is 4 or 5, “A” is at least one element selected from Na, K, Pb, Ba, Sr, Ca and Bi, and “B” is at least one element selected from Fe, Co, Cr, Ga, Ti, Nb, Ta, Sb, V, Mo, W and Mn, and a second bismuth layer-structured compound layer to be stacked with said first bismuth layer-structured compound layer, including bismuth in excess of that in said composition formula of said first bismuth layer-structured compound layer, wherein a thickness of said second bismuth layer-structured compound layer is thinner than a thickness of said first bismuth layer-structured compound layer.