Orientation of the piezoelectric ceramic, a piezoelectric element, a liquid discharge head, an ultrasonic motor and filter element

The present invention provides a piezoelectric satisfactory orientation of the piezoelectric ceramic, comprising a metal oxide represented by (1-x) NaNbO3-xBaTiO3 represented. Also provides the use of a piezoelectric element including orientation of the piezoelectric ceramic metal oxide by (1-x) NaNbO3-xBaTiO3 represented, and using a liquid discharge head, an ultrasonic motor and a filter member of the piezoelectric element. Orientation of the piezoelectric ceramic comprises the following general formula (1) a metal oxide as a principal component, wherein the orientation of the piezoelectric ceramic having both 1,000ppm or less of lead content and the potassium content: (1-x) NaNbO3-xBaTiO3. .. general formula (1), which satisfies 0 & lt; x & lt; relationship 0.3.