Ngk Insulators, Inc.

Yuya Kikuta

Toshikatsu Kashiwaya

Tsutomu Nanataki

Hirofumi Yamaguchi

Yukihisa Takeuchi

Kazuyoshi Shibata

Koji Ikeda

Kazumasa Kitamura

Tomohiko Hibino

Nobuchika Noguchi

There is provided a piezoelectric/electrostrictive element having little decease of Qm even in a high electric field in the case of a piezoelectric element. The piezoelectric/electrostrictive body is characterized in that the rate of Qm in an electric field of 10 V/mm is 30% or more with respect to Qm in an electric field of 1 V/mm.

Piezoelectric / electrostrictive material, piezoelectric / electrostrictive ceramic composition, piezoelectric / electrostrictive element, and piezoelectric motor

There is disclosed a piezoelectric/electrostrictive porcelain composition capable of manufacturing, at a comparatively low sintering temperature, a piezoelectric/electrostrictive body which is dense and superior in crystallinity and which has satisfactory piezoelectric/electrostrictive characteristics so that deviation of the composition is not easily generated. The piezoelectric/electrostrictive porcelain composition contains as a major component a piezoelectric/electrostrictive porcelain composition component including a PbMgNbO&#x2014;PbZrO&#x2014;PbTiOternary solid solution system composition and NiO or including a Pb(Mg, Ni)NbO&#x2014;PbZrO&#x2014;PbTiOternary solid solution system composition, and further contains lead germanate.

Method of manufacturing a piezoelectric/electrostrictive device

Piezoelectric/electrostrictive porcelain composition, piezoelectric/electrostrictive device, and method of piezoelectric/electrostrictive device

A piezoelectric/electrostrictive device is provided with a stationary portion, a thin-plate portion supported by the stationary portion, and piezoelectric/electrostrictive element formed by alternately laminating a plurality of electrodes and a plurality of piezoelectric/electrostrictive layers. The piezoelectric/electrostrictive device is produced by cutting a thin-plate body that composes the thin-plate portion afterward and a laminated body comprising the piezoelectric/electrostrictive layers and thereafter applying prescribed specific processing (for example, heat treatment) to the cut plane (the lateral end surfaces). By so doing, the ratio of the actual surface area of the lateral end surface of the piezoelectric/electrostrictive element to the area of the lateral end surface of the piezoelectric/electrostrictive element in the orthographic projection is four or less, and the deposition of moisture on the lateral end surfaces is suppressed to the extent of not substantially generating electric leakage or ion migration. As a result, a highly durable piezoelectric/electrostrictive device can be provided.

Piezoelectric/electrostrictive device

A piezoelectric/electrostrictive porcelain composition capable of being manufactured at a comparatively low firing temperature is provided, as well as a piezoelectric/electrostrictive ceramic or a piezoelectric/electrostrictive portion which is dense and superior in crystallinity and which has superior piezoelectric/electrostrictive characteristics and durability even under high temperature and high humidity conditions. The piezoelectric/electrostrictive porcelain composition includes a piezoelectric/electrostrictive component containing lead titanate zirconate, and 0.5 to 5% by mass of glass component containing 8% by mass or less of silicic acid.

Piezoelectric/electrostrictive porcelain composition, piezoelectric/electrostrictive ceramic and piezoelectric/electrostrictive film type device

Growing community of inventors

Nagoya, Japan

Yuya Kikuta