Murata Manufacturing Co., Ltd.

Ryoko Katayama

Shinichiro Kawada

Katsuhiro Horikawa

A main component has a general formula of {(1&#x2212;x)(KNaLi)(NbTaSb)O(M1Bi)M2O} (wherein M1 is Ca, Sr or Ba, M2 is Ti, Zr or Sn, 0.005&#x2266;x&#x2266;0.5, 0&#x2266;a&#x2266;0.9, 0&#x2266;b&#x2266;0.3, 0&#x2266;a+b&#x2266;0.9, 0&#x2266;c&#x2266;0.5, 0&#x2266;d&#x2266;0.1, 0.9&#x2266;m&#x2266;1.1, and 0.9&#x2266;n&#x2266;1.1). At least one specific element selected from the group consisting of In, Sc, Y, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb and Lu is contained at as in sample numbers 46 to 48, 0.1 to 10 mol in total per 100 mols of the main component (preferably, 1.5 to 10 mol). This provides a piezoelectric ceramic composition and a piezoelectric ceramic electronic component that can have a desired high piezoelectric d constant in a consistent and highly efficient manner in both a very low electric field and a high electric field.

Piezoelectric ceramic composition and piezoelectric ceramic electronic component

A ceramic powder contains a principal component that is a perovskite-type complex oxide represented by the formula ANbO(A is at least one selected from alkali metal elements and contains 10 mole percent or more of K) and also contains 0.0001 mole or more of an element per mole of the principal component. The element is at least one selected from the group consisting of Yb, Y, In, Nd, Eu, Gd, Dy, Sm, Ho, Er, Tb, and Lu. The ceramic powder preferably further contains at least one selected from the group consisting of Ti, Zr, and Sn. This enables that a non-deliquescent alkali niobate-based ceramic powder is produced at a high yield.

Ceramic powder and method for producing ceramic powder

A piezoelectric ceramic composition includes a primary component represented by the formula (1-x)(KNaLi)(NbTaSb)O-xM1M2O, and 0.1 to 10 moles (preferably 1.5 to 10 moles) of at least one specific element selected from the group consisting of In, Sc, Y, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, and Lu with respect to 100 moles of the primary component, wherein M1 is Ca, Sr, or Ba M2 is Ti, Zr, or Sn; and x, a, b, c, d, m, and n satisfy 0.005&#x2266;x&#x2266;0.1, 0&#x2266;a&#x2266;0.9, 0&#x2266;b&#x2266;0.3, 0&#x2266;a+b&#x2266;0.9, 0&#x2266;c&#x2266;0.5, 0&#x2266;d&#x2266;0.1, 0.9&#x2266;m&#x2266;1.1, and 0.9&#x2266;n&#x2266;1.1. Preferably, Mn, Ni, Fe, Zn, Cu, or Mg is further added. As a result, at both a very low and a high electric field, a high piezoelectric d constant can be stably obtained with a high efficiency.

Piezoelectric ceramic composition, method for manufacturing the same, and piezoelectric ceramic electronic component

A piezoelectric ceramic composition represented by the formula (1-x) (KNaLi)(NbTaSb)O-x(KNaM3) M4O, wherein M3 represents a metal element that is at least one of Yb, Y, In, Nd, Eu, Gd, Dy, Sm, Ho, Er, Tb, and Lu; M4 represents a metal element that is at least one of Ti, Zr, and Sn; and x, a, b, c, d, and m satisfy the inequalities 0.001&#x2266;x&#x2266;0.1, 0&#x2266;a&#x2266;0.9, 0&#x2266;b&#x2266;0.3, 0&#x2266;a+b&#x2266;0.9, 0&#x2266;c&#x2266;0.5, 0&#x2266;d&#x2266;0.1, and 0.7&#x2266;m&#x2266;1.3. The piezoelectric ceramic composition is not sintering resistant and has desired, sufficient piezoelectric properties as well as a sufficient firing temperature range suitable for mass production. Furthermore, the piezoelectric ceramic composition is effective in preventing insufficient polarization and effective in increasing the yield of products.

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Higashiomi, Japan

Ryoko Katayama