Method for preparing Ha, Bi and Ca co-doped potassium-sodium niobate leadless piezoelectric ceramic by solid-phase sintering method

The invention relates to a method for preparing Ha, Bi and Ca co-doped potassium sodium niobate leadless piezoelectric ceramic by a solid-phase sintering method, the molecule of the leadless piezoelectric ceramic is (1-x) K0. 5Na0. 5Nb0. 95Sb0. 05O3-x (Bi0. 5Ca0. 5) HfO3, and x is more than or equal to 0 and less than or equal to 0.05; the 0.97 KNNS-0. 03BCH ceramic has the advantages of remarkable piezoelectric and ferroelectric properties, higher Curie temperature, optimal piezoelectric thermal stability and the like, and specifically comprises 3367% of epsilon r, 0.023% of tan delta, 41715%of epsilon rPr, 43.8% of kp, 478.6 pm/V of d * 33, 392 pC/N of d33 and better Curie temperature Tc of 295 DEG C, and good thermostability Delta d33/d33 is less than 6%, therefore, the method has bright market prospect and development potential. 本发明涉及一种固相烧结法制备Ha、Bi、Ca共掺杂铌酸钾钠无铅压电陶瓷的方法，所述无铅压电陶瓷的分子是(1-x)K0.5Na0.5Nb0.95Sb0.05O3-x(Bi0.5Ca0.5)HfO3，其中0≤x≤0.05；本发明0.97KNNS-0.03BCH陶瓷表现出显著的压电和铁电性能、较高的居里温度及最佳的压电热稳定性等优点，具体包括εr为3367、ta