发明公开
EP1311006A4 THIN-FILM PIEZOELECTRIC ELEMENT 审中-公开
压电性薄膜元件

THIN-FILM PIEZOELECTRIC ELEMENT
摘要:
To provide a piezoelectric thin film having an improved and stable characteristic by controlling stress applied during forming a piezoelectric thin film and providing the piezoelectric thin film having a perovskite structure. A thin film piezoelectric element in which a lower electrode is formed on a substrate, a piezoelectric thin film containing lead is formed on the lower electrode, and an upper electrode is further placed on the piezoelectric thin film, characterized in that the piezoelectric thin film is a dielectric with the perovskite structure having lead, zirconium, and titanium as the main ingredients, and is in a composition region in which, in the composition of the whole piezoelectric thin film, the Zr/(Zr + Ti) ratio is not less than 0.53, and has a crystal structure of the tetragonal system in which a c axis is longer than an a axis.
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