Piezoelectric porcelain and method for production thereof

Abstract

The invention provides a piezoelectric substrate which can be used for providing a piezoelectric porcelain which exhibits a wide range of service temperature, can exhibit a great displacement, can be produced through easy firing operation, and further is excellent from the view points of low pollution, the friendliness to the environment, and ecology, and a method for producing the piezoelectric substrate. A piezoelectric substrate (1) which comprises (1-m-n){Na1-x-yKxLiy}(Nb1-zTaz)O3} + m{(M1)ZrO3} + n{M2(Nb1-wTaw)2O6} as a primary component, wherein M1 and M2 are alkaline earth metal elements, and wherein x, y, m and n preferably satisfy 0.1 <= x <= 0.9, 0 <= y <= 0.1, 0 < m < 0.1, and 0 < n <= 0.01. The piezoelectric substrate can have a high Curie temperature and can generate a great displacement, and further the firing operation for the piezoelectric substrate can be carried out with ease. (M1)ZrO3 is first prepared and then is mixed with other materials.

Description

technical field [0001] The invention relates to a piezoelectric ceramic and a manufacturing method thereof. The piezoelectric ceramic includes a composition containing a perovskite oxide and a tungsten bronze oxide, and is suitable for vibration elements, sounding bodies or sensors etc. Background technique [0002] Actuators made of piezoelectric ceramics utilize the so-called piezoelectric phenomenon that produces mechanical strain and stress when an electric field is applied. The characteristic of this kind of actuator is that it can obtain a small amount of displacement with high precision, and at the same time generate relatively large stress, etc., for example, it can be used for the positioning of precision working machinery and optical devices. Lead zirconate titanate (PZT), which has excellent piezoelectric properties, has been used the most as piezoelectric ceramics for actuators. However, lead zirconate titanate contains a lot of lead, and the dissolution of lea...

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Problems solved by technology

[0004] However, these lead-free piezoelectric ceramics have problems in that they have lower piezoelectric performance and cannot obtain a large enough displacement compared to lead-based piezoelectric ceramics.

In addition, piezoelectric ceramics with sodium potassium lithium niobate as the main component also have problems. Sodium, potassium and lithium are easy to volatilize during firing, and it is difficult to fire.

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