The invention discloses a
bismuth ferrite /
lead titanate based functional
ceramic material and a preparation method thereof. The preparation method comprises the following steps: weighing required raw materials according to a stoichiometric ratio, fully and uniformly mixing the raw materials,
grinding the raw materials to a relatively
small particle size to obtain an original material, prepressing the original material into a sheet, and pre-
sintering the sheet in a high-temperature reaction furnace;
grinding the sample obtained through presintering in a
mortar into
powder with the appropriate particle size for the second time, adding a binder for
granulation, and conducting the tabletting and shaping on the sample again in a high-temperature reaction furnace, heating the sample to 500 DEG C and conducting heat preservation for 30 min for
viscosity removal, and heating the sample to the target
sintering temperature of 1000-1300 DEG C at the high temperature rising rate, meanwhile, feeding
oxygen into the furnace, and performing heat preservation for 100-300 min; finally, conducting in-furnace cooling to the
room temperature to obtain a target
ceramic sample. The
ceramic crystal phase structure is a pure
perovskite phase, has excellent multifunctionality, shows a saturated
ferroelectric hysteresis loop, has the maximum ferroelectric polarization exceeding 70 [mu] C / cm < 2 >, has significant piezoelectric response, has the positive
piezoelectric coefficient exceeding 100 pC / N, the inverse
piezoelectric coefficient reaching 200 pm / V and the like.