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Provided is a Sr 2-x Ca x NaNb 5 O 15 type piezoelectric ceramic composition wherein the inhibition of cracking and an improvement in the piezoelectric characteristics are attained by improving the composition uniformity and the microstructure uniformity. In the basic Sr 2-x Ca x NaNb 5 O 15 composition, the (Sr, Ca)/Na ratio is changed, whereby the occupancies of Sr, Ca and Na in lattices which constitute the tungsten-bronze type structure and into which Sr, Ca, and Na can enter are reduced to facilitate the entrance of Sr into the lattices and thus inhibit the formation of a secondary phase. Further, a predetermined amount of Al and/or Si is added to lower the sintering temperature and to make the microstructure uniform. Additionally, a predetermined amount of Mn is added to make the polarization easy.
Provided is a Sr 2-x Ca x NaNb 5 O 15 type piezoelectric ceramic composition wherein the inhibition of cracking and an improvement in the piezoelectric characteristics are attained by improving the composition uniformity and the microstructure uniformity. In the basic Sr 2-x Ca x NaNb 5 O 15 composition, the (Sr, Ca)/Na ratio is changed, whereby the occupancies of Sr, Ca and Na in lattices which constitute the tungsten-bronze type structure and into which Sr, Ca, and Na can enter are reduced to facilitate the entrance of Sr into the lattices and thus inhibit the formation of a secondary phase. Further, a predetermined amount of Al and/or Si is added to lower the sintering temperature and to make the microstructure uniform. Additionally, a predetermined amount of Mn is added to make the polarization easy.
PIEZOELECTRIC PORCELAIN COMPOSITION
PIEZOELEKTRISCHE KERAMIKZUSAMMENSETZUNG
COMPOSITION DE CÉRAMIQUE PIÉZOÉLECTRIQUE
YUTAKA DOSHIDA (author)
2018-11-21
Patent
Electronic Resource
English
LEAD-FREE PIEZOELECTRIC PORCELAIN COMPOSITION AND PIEZOELECTRIC ELEMENT
| European Patent Office | 2022
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| European Patent Office | 2024