Tdk Corporation

Hiroki Katoh

Yuiko Hirose

Masakazu Hirose

Yumi Akiyama

Masahito Furukawa

Taku Masai

Yuji Umeda

Tamotsu Sasaki

Mirai Ishida

A piezoelectric composition containing: at least one or more elements selected from alkali metal elements; at least one or more elements selected from a group consisting of vanadium, niobium, and tantalum; copper or copper and germanium; and oxygen. The piezoelectric composition has a main phase, and a high Cu-concentration phase in which a content ratio of copper is higher than the main phase, and when a content ratio of oxygen in the high Cu-concentration phase is set as O, and a content ratio of copper is set as Cu, Oand Cusatisfy relationships of 51≤O≤60 and 2.0≤Cu≤15.

Piezoelectric composition, piezoelectric element, piezoelectric device, piezoelectric transformer, ultrasonic motor, ultrasonic wave-generating element, and filter element

Provided is a piezoelectric element according to the invention including a stacked body in which a piezoelectric layer and an internal electrode layer are stacked. In addition, the internal electrode layer contains at least one kind of element selected from palladium, nickel, platinum, gold, and silver, and copper, and the content of copper contained in the internal electrode layer is 1 to 50 at % in terms of a copper element.

Piezoelectric element, piezoelectric actuator, and piezoelectric transformer

A piezoelectric composition including manganese and a complex oxide having a perovskite structure represented by a general formula ABO, wherein an A site element in the ABOis potassium or potassium and sodium, a B site element in the ABOis niobium, a concentration distribution of the manganese has a variation, and the variation shows a CV value of 35% or more and 440% or less.

Piezoelectric composition and piezoelectric element

A piezoelectric composition containing: a complex oxide having a perovskite structure represented by a general formula of ABO; copper; and one or more elements selected from the group consisting of chromium, nickel and zinc, in which in ABO, an A-site element is potassium and a B-site element is niobium, or niobium and tantalum, with respect to 1 mol of the complex oxide, a content ratio of the copper is &#x3b1; mol % in terms of CuO, a content ratio of one or more elements selected from the group consisting of chromium, nickel and zinc is &#x3b2; mol % in terms of CrO, NiO, ZnO, &#x3b1; satisfies a relationship of 0.2&#x2264;&#x3b1;&#x2264;2.5, and &#x3b2; satisfies a relationship of 0.2&#x2264;&#x3b2;&#x2264;2.0.

A piezoelectric composition including copper and a complex oxide having a perovskite structure represented by a general formula ABO, in which an A site element in the ABOis potassium or potassium and sodium, a B site element in the ABOis niobium or niobium and tantalum, the copper is included in n mol % in terms of a copper element with respect to 1 mol of the complex oxide, and n satisfies 0.100&#x2264;n&#x2264;1.000.

A piezoelectric composition having a complex oxide including potassium and niobium, in which the complex oxide has a first phase represented by a compositional formula KNbO, and one or two phases selected from a second phase represented by a compositional formula KNbOand a third phase represented by a compositional formula KNbO.

A piezoelectric composition including copper, germanium and a complex oxide represented by a compositional formula KNbOand having a perovskite structure, in which m in the compositional formula satisfies 0.970&#x2264;m&#x2264;0.999, and with respect to 1 mol of the complex oxide, x mol % of copper in terms of a copper element and y mol % of germanium in terms of a germanium element are contained, wherein x satisfies 0.100&#x2264;x&#x2264;1.000 and y satisfies 0.000&#x3c;y&#x2264;1.500.

The present invention aims to provide a piezoelectric composition which is free of lead based compounds and is represented by the following formula (1), (BiNaBaCa)(TiHf)O(1), wherein, x, y, z and a in formula (1) meets the following conditions, 0.70x0.90, 0.02y0.28, 0.02z0.28, 0.90a1.10 and x+y+z=1. The present invention also provides a piezoelectric device having the piezoelectric composition mentioned above.

Piezoelectric composition and piezoelectric device

The present invention aims to provide a piezoelectric composition and a piezoelectric element. In the piezoelectric composition, the main component is represented by the following formula with a perovskite type structure,(BiNa)(TiMgMe)Owherein, 0.05&#x2266;x&#x2266;0.7, 0.01&#x2266;y&#x2266;0.7, 0.01&#x2266;z&#x2266;0.6, 0.75&#x2266;m&#x2266;1.0, x+y+z=1 and the transition metal element Me is any one or more selected from the group consisting of Mn, Cr, Fe and Co.

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Tokyo, Japan

Hiroki Katoh