| 摘要 |
There is disclosed a piezoelectric/electrostrictive body which has superior piezoelectric/electrostrictive properties and which exhibits a sufficient durability even in a case where a flexural displacement is repeated a large number of times. A piezoelectric/electrostrictive body 30 is constituted of a large number of crystal grains 31 having the piezoelectric/electrostrictive properties in the form of a film or a layer having one or more layers. A number ratio of crystal grains 32 , a part of which is exposed to at least one of interfaces 35 a, 35 b between the bodies and the outside in a thickness direction, is 80% or more of a large number of crystal grains 31 observed in an arbitrary section in the thickness direction.
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