Canon Kabushiki Kaisha

National Institute of Advanced Industrial Science and Technology

University of Yamanashi

Keisuke Yamato

Satoshi Wada

Toshihiro Ifuku

Nobuhiro Kumada

Takashi Iijima

Takayuki Watanabe

Bong-Yeon Lee

Jumpei Hayashi

Hiroshi Funakubo

Zuyi Zhang

Masaki Azuma

Soichiro Okamura

Provided is a piezoelectric material having good piezoelectric properties and a Curie temperature (Tc) of 150&#xb0; C. or higher, and a piezoelectric device using the piezoelectric material. The piezoelectric material includes a sintered body made of a perovskite-type metal oxide represented by the following general formula (1): xBi(MgTi)O-(1-x)BaTiO(1), where x satisfies 0.17&#x2266;x&#x2266;0.8, in which an average grain size of grains contained in the sintered body is 0.5 &#x3bc;m or larger to 10 &#x3bc;m or smaller, and the sintered body is polycrystalline. In addition, the piezoelectric device includes a piezoelectric material and a pair of electrodes disposed in contact with the piezoelectric material, in which the piezoelectric material is the above-mentioned piezoelectric material.

Piezoelectric material, method of manufacturing the same, and piezoelectric device

Provided is a piezoelectric material having good piezoelectric properties and a Curie temperature (Tc) of 150&#xb0; C. or higher, and a piezoelectric device using the piezoelectric material. The piezoelectric material includes a sintered body made of a perovskite-type metal oxide represented by the following general formula (1):Bi(MgTi)O-(1-)BaTiO&#x2003;&#x2003;(1),where x satisfies 0.17&#x2266;x&#x2266;0.8, in which an average grain size of grains contained in the sintered body is 0.5 &#x3bc;m or larger to 10 &#x3bc;m or smaller, and the sintered body is polycrystalline. In addition, the piezoelectric device includes a piezoelectric material and a pair of electrodes disposed in contact with the piezoelectric material, in which the piezoelectric material is the above-mentioned piezoelectric material.

Provided is a piezoelectric material including a lead-free perovskite-type composite oxide which is excellent in piezoelectric characteristics and temperature characteristics and is represented by the general formula (1):ABO-A'BO-A&#x2033;B&#x2032;Oin which A is a Bi element; A&#x2032; is a rare earth element including La; B is at least one element selected from Ti, Zn, Sn and Zr; A&#x2033; is at least one element selected from Ba, Sr and Ca; B&#x2032; is at least one element selected from divalent, trivalent, pentavalent, tetravalent, and hexavalent elements; and x is a value of 0.10 or more and 0.95 or less, y is a value of 0 or more and 0.5 or less, and z is a value of 0 or more and 0.7 or less, provided that x+y+z=1.

Piezoelectric material

Growing community of inventors

Kofu, Japan

Keisuke Yamato