Design of dielectric and pyroelectric properties by use of spark plasma sintering method

采用放电等离子烧结法(SPS)，通过在两种不同成分之间进行成分分级，制备了在较宽温度范围内具有高热释电系数的热释电材料。得到了在20℃~50℃范围内具有较高热释电系数的热释电材料。在这项研究中，通过从两种组合物的混合物中扩散处理SPS烧结体，也获得了类似的性能。在这种方法中，由于扩散引起的体积变化，往往会产生裂缝。新开发的方法解决了这个问题。因此，新开发的方法具有广泛的应用前景。为了获得具有较少缺陷的材料，希望将起始材料固定在更高的温度。然而，在高温下烧成会降低材料的烧结性。这是通过使用纳米研磨技术来克服的。利用BaNd_2Ti_4O_&lt；12&gt；/Bi_4Ti_3O_&lt；12&gt；/Bi_4Nd_2Ti_4O_&lt；12&gt；的特性，成功地制备了SPS层压材料。以此为原料，成功地制备了纳米氧化锌和氧化铌。

A method of a fabrication of pyroelectric material that exhibits high pyroelectric coefficient over a wide temperature region was developed using spark plasma sintering method (SPS) by a gradation of composition between two different compositions. Conditions were widely determined and the pyroelectric material which exhibits high pyroelectric coefficient in the region between 20℃ and 50℃ was obtained. In the beguiling of this research, similar property was attained by a diffusion treatment of a SPS-sintered body from a mixture of two compositions. By this method, crack is often caused because of the volume change by diffusion. Newly developed method cleared this problem. So, the newly developed method can be applied to a wide area. In order to obtain a material having few defects, starting material is desired to be fixed at higher temperatures. However, firing at high temperatures lowers the sinterability of the material. This was overcome by a use of nano-milling technology. Preparation of BaNd_2Ti_4O_<12>/Bi_4Ti_3O_<12>/Bi_4Nd_2Ti_4O_<12> laminated material was also succeeded using the characteristics of SPS. As a preparation of starting material, methods to fabricate nano-sized zinc oxide and niobium oxide were succeeded.