Experimental analysis of pure oxides

Experimental analysis of pure oxides as raw materials: Pb3 O4, TiO2, ZrO2, ZnO, Nb2O5, M nO2, Sb2 O3. According to the formula x Pb O3- y PbO3 - z PbTiO3 -, Pb ZrO3 + rM n, where is 0. 10 ~ 0. 20, y = 0. 020 ~ 0. 040, z = 0. 4 ~ 0 5, Doping amount of r (Mn) were 0.1%, 0.2%, 0.4% and 0.8% piezoelectric bimorph discs were weighed ingredients. The weighing mixed oxide was ball milled for 6 h on an agate jar and agate ball, then sieved dry and preform at 40 M Pa. Pre-burning temperature is 800 ~ 850°C, pre-burning is 2 h. The pre-calcined piezo transducer discs was ground for secondary milling. The dried powder was pelletized and then molded under the pressure of 120 M Pa. The sample size was 16 mm×1 mm. After the green body was molded, it was sintered at 1200-1 260°C for 1h about. The sintered piezo disc circuit is wafer grinding, cleaning, drying, the sample is on the upper and lower electrodes. The polarization conditions of the sample is under the polarization environment in 120C. the polarization electric field of soldering piezo discs is 3 kv / mm, polarization is 20 min at the room temperature for 48 h.after the test its performance.The phase analysis of the brass piezo crystal datasheet was carried out by Rigaku 3015 X-ray diffractometer and the cross section of the sintered sample was analyzed by SEM.The dielectric constant X and tan W at room temperature were measured by DF2811 digital bridge, and the test frequency of piezo disc pickup is 1 kHz. According to the national piezoelectric ceramic test standards to determine the curie temperature. Using the Chinese Academy of Sciences Beijing Institute of acoustics ZJ-2 quasi-static d33 tester test sample piezoelectric constant d33. The resonance frequency fr, the anti-resonance frequency fa and the overtone frequency of the piezo cylinder transducers were measured by the line transmission method, and kp and Q m were obtained through look-up table and calculation. The morphological analysis is respectively the second electron image with different Mn doping content. It can be seen from the cross-sectional morphology that as the M doping amount increases, the grain size of the sample gradually increases, and when the doping amount r= 0.4%, the grain size is the largest. With the increase of Mn content, the grain size decreases and the grain distribution becomes more and more uneven.