Fund Project: The National Natural Science Foundation of China (20H1015) is a perovskite ferroelectric material with high Curie temperature, high axial ratio, and low dielectric constant. It is widely used in aerospace industry, medical engineering, etc. Cutting-edge fields. In recent years, studies on its pyroelectric properties have found that high-strength, high-density PT ceramics are excellent pyroelectric materials and are limited only by their difficult preparation. Sel-gel method as a wet chemical synthesis method has the advantages of uniform material composition, simple process, and low cost, and is widely used in the preparation of ultrafine powders and thin films. However, the traditional Sel-gel method has a slow hydrolysis rate and a high sintering temperature. The shortcomings of long preparation cycle etc.16. In order to overcome these deficiencies, this article firstly adopted the method of aqueous methanol solution hydrolysis and fresh gel direct sintering in the sol, and realized the rapid synthesis of PT nanocrystals.
The electrical hysteresis loop of 1 can be obtained as the residual polarization strength = 30.1ccm-2 and coercive electric field £! = 5.1 kBcm-1, as evident from the reported results, the PT ceramics prepared by the improved Sel-gel method are still ferroelectric materials with a high coercive electric field.
Under the electric field of 3,5kBcm-1, the polar geese were tested according to the results of the multi-frequency capacitance instrument. The pyroelectric coefficient at 203 was obtained by the charge integration method. p=4.1x10-FGcm-2"K-1, indicating the polarization condition here Insufficient polarization rate affects the performance of PT ceramics greatly.The problem that PT ceramics are difficult to polarize is a long-standing and urgent problem to be solved. The research group has made some attempts to find that doping methods can be used to a certain degree. Reduce the coercive field to increase the polarizability.
3 Conclusions (1) Adding a certain concentration of aqueous methanol solution to the sol system under vigorous agitation can speed up the hydrolysis rate and quickly prepare the newly prepared gel of PT(2) without drying. Direct calcination can obtain PT nanocrystals with good crystallization conditions. Crystals greatly shorten the preparation cycle of PT nanocrystals. In the preparation process of PT nanocrystals, the higher the calcination temperature in the temperature range of 400 (800), the better the crystallization condition. As the temperature rises, the grains gradually grow up and the tetragonal phase grows. The trend is increasing! The axial mobility of atoms in the axial direction increases. The anisotropy increases the piezoelectric effect is more prominent.) The PT ceramics prepared by the improved Sel-gel method have high purity, good compactness, dielectric properties and ferroelectric properties. The PT ceramic is basically the same as that produced by the traditional Sel-gel method. PT ceramic is a ferroelectric material with high coercive electric field. It is extremely difficult to polarize and it is difficult to polarize under the polarization conditions of 250 and 25 cm-1. Doping methods should be adopted to reduce the coercive electric field and increase the polarizability.
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