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PIEZOELECTRIC CERAMIC AND PIEZOELECTRIC ELEMENT
The present invention provides a piezoelectric ceramic and a piezoelectric element, which have a large dynamic d 33 (dynamic piezoelectric coefficient d 33 ), can be used even under an elevated temperature of 200°C, and exhibit a small variation between the dynamic d 33 at room temperature and the dynamic d 33 at 200°C. The piezoelectric ceramic of the present invention is characterized by containing 100 parts by mass of a bismuth layered compound as a main component and a total of 0.05 to 1 part by mass, in terms of oxides (MnO 2 and Fe 2 O 3 ), of at least one of Mn and Fe, the bismuth layered compound being represented by a compositional formula of Bi 4 Ti 3 O 12 ·²[(1-³)M1TiO 3 ·³M2M3O 3 ], wherein ² and ³ satisfy the following formulae: 0.405 ¤ ² ¤ 0.498 and 0 ¤ ³ ¤ 0.3, M1 represents at least one selected from Sr, Ba, Ca, (Bi 0.5 Na 0.5 ), (Bi 0.5 Li 0.5 ) and (Bi 0.5 K 0.5 ), M2 is at least one selected from Bi, Na, K and Li, and M3 is at least one of Fe and Nb.
PIEZOELECTRIC CERAMIC AND PIEZOELECTRIC ELEMENT
The present invention provides a piezoelectric ceramic and a piezoelectric element, which have a large dynamic d 33 (dynamic piezoelectric coefficient d 33 ), can be used even under an elevated temperature of 200°C, and exhibit a small variation between the dynamic d 33 at room temperature and the dynamic d 33 at 200°C. The piezoelectric ceramic of the present invention is characterized by containing 100 parts by mass of a bismuth layered compound as a main component and a total of 0.05 to 1 part by mass, in terms of oxides (MnO 2 and Fe 2 O 3 ), of at least one of Mn and Fe, the bismuth layered compound being represented by a compositional formula of Bi 4 Ti 3 O 12 ·²[(1-³)M1TiO 3 ·³M2M3O 3 ], wherein ² and ³ satisfy the following formulae: 0.405 ¤ ² ¤ 0.498 and 0 ¤ ³ ¤ 0.3, M1 represents at least one selected from Sr, Ba, Ca, (Bi 0.5 Na 0.5 ), (Bi 0.5 Li 0.5 ) and (Bi 0.5 K 0.5 ), M2 is at least one selected from Bi, Na, K and Li, and M3 is at least one of Fe and Nb.
PIEZOELECTRIC CERAMIC AND PIEZOELECTRIC ELEMENT
PIEZOELEKTRISCHE KERAMIK UND PIEZOELEKTRISCHES ELEMENT
CÉRAMIQUE PIÉZOÉLECTRIQUE ET ÉLÉMENT PIÉZOÉLECTRIQUE
FUKUOKA SHUUICHI (author)
2016-08-24
Patent
Electronic Resource
English
IPC:
C01G
Verbindungen der von den Unterklassen C01D oder C01F nicht umfassten Metalle
,
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
/
C04B
Kalk
,
LIME
/
H01L
Halbleiterbauelemente
,
SEMICONDUCTOR DEVICES
/
H03H
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
,
Scheinwiderstandsnetzwerke, z.B. Resonanzkreise
| European Patent Office | 2017