Title:
PIEZOELECTRIC CERAMIC COMPOSITION
Document Type and Number:
Japanese Patent JP3244027
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a piezoelectric material capable of resisting to its employment at high temperatures by including a bismuth laminar compound as a main component and manganese as an auxiliary component in a specific amount converted into MnCO3.
SOLUTION: This piezoelectric ceramic composition having a piezoelectric constant d33 of ≥25 pC/N comprises a main component represented by the formula: (Na0.5Bi0.5)Bi4Ti4O15 and manganess as an auxiliary component in an amount of 0.7-3.0 wt.% under a condition of ≥500°C. A composition represented by the formula: (Na0.5Bi0.5)1-XBi4Ti4O15 wherein a part of (Na0.5Bi0.5) is replaced by a divalent metal has an enlarged piezoelectric constant. A compound represented by the formula: (Na0.5Bi0.5)1-y(A10.5A20.5)yBi4Ti4O15 wherein a part of (Na0.5Bi0.5) is replaced by monovalent ant trivalent metals has a Curie point of about 600°C and does not eliminate its piezoelectric property even at ≥600°C. In the formula, M is a divalent metal such as Sr, Ba or Pd; 0<(x)≤0.5; A1 is a monovalent metal such as K or Li; A2 is a trivalent metal such as Bi; 0<(y)≤0.5.
Inventors:
Masahiko Kimura
You Ando
You Ando
Application Number:
JP18290497A
Publication Date:
January 07, 2002
Filing Date:
July 09, 1997
Export Citation:
Assignee:
MURATA MANUFACTURING CO.,LTD.
International Classes:
C04B35/46; C04B35/475; H01L41/187; (IPC1-7): C04B35/46; H01L41/187
Domestic Patent References:
| JP648825A | ||||
| JP5067492A | ||||
| JP5516380A | ||||
| JP5024314A | ||||
| JP5045999A |
Other References:
Ｔ．ＴＡＫＥＮＡＫＡ，ｅｔ ａｌ．，「ＰＩＥＺＯＥＬＥＣＴＲＩＣ ＡＮＤ ＰＹＲＯＥＬＥＣＴＲＩＣ ＰＲＯＰＥＲＴＩＥＳ ＯＦ ＣＡＬＣＩＵＭ−ＭＯＤＩＦＩＥＤ ＡＮＤ ＧＲＡＩＮ−ＯＲＩＥＮＴＥＤ（ＮａＢｉ）１／２Ｂｉ４Ｔｉ４Ｏ１５ ＣＥＲＡＭＩＣＳ」，ＲＥＲＲＯＥＬＥＣＴＲＩＣＳ（１９８９），第９４巻，第１７５−１８１頁