| abstract |
(57) [Problem] To provide, for example, a piezoelectric element, an ink jet head, and a discharge device which are excellent in piezoelectric characteristics. A main part of an ink jet recording head (H) is an ink chamber substrate (20) forming a plurality of ink chambers (210). No. 0 has a nozzle plate 100 on one surface, and a vibrating plate 3 The piezoelectric element 400 is attached to the vibration plate 300 at a position corresponding to each ink chamber 210. 0. Each piezoelectric element 400 includes a piezoelectric layer 430 as an upper electrode 410 and a lower electrode 42. 0. In the present invention, the piezoelectric layer 430 enters an antiferroelectric state just below the Curie temperature, A ferroelectric substance in a temperature range of −20 to 100 ° C., and It is characterized by containing a metal oxide having a perovskite structure that does not show a structural phase transition in the above temperature range, or containing this metal oxide and a metal oxide having another perovskite structure. |