| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a piezoelectric ceramic composition capable of being fired at a low temperature under a low oxygen reducing atmosphere and a lamination type piezoelectric element exhibiting sufficient displacement even under a high voltage of ≥1 kV/mm. <P>SOLUTION: The piezoelectric composition contains a multiple oxide expressed by a following formula as a main component, 0<α≤0.5 mass% Cu expressed in terms of Cu<SB>2</SB>O (α) as a first accessory component, 0<β≤0.2 mass% at least one kind selected from Co, Ni, Ga and Mg, where (β) is expressed in terms of oxide in Co, Ni and Ga and is expressed in terms of carbonate in Mg, as a second accessory component, 0<γ≤0.6 mass% at least one kind selected from Ta, Nb, W and Sb expressed in terms of oxide (γ) as a third accessory component. The composition formula is Pb<SB>a</SB>[(Zn<SB>1/3</SB>Nb<SB>2/3</SB>)<SB>x</SB>Ti<SB>y</SB>Zr<SB>z</SB>]O<SB>3</SB>, where in the formula, (a), (x), (y) and (z) respectively satisfy 0.96≤a≤1.03, 0.005≤x≤0.047, 0.42≤y≤0.53, 0.45≤z≤0.56 and x+y+z=1. <P>COPYRIGHT: (C)2008,JPO&INPIT |
