层状钙钛矿多铁材料.doc

层状钙钛矿多铁材料 Bi6FeCrTi3O18陶瓷制备及性能研究 微电子系 0601班 陈新娟 指导老师：毛翔宇 摘要： 通过氧化物Bi2O3, TiO2, Fe2O3 Cr2O3，采用传统固相烧结工艺制备五层钙钛矿多铁材料Bi6FeCrTi3O18。不同的烧结温度和时间下通过XRD谱分析我们发现在合适的烧结条件下单相五层钙钛矿结构通过扫描电镜对样品形貌进行观察，的晶体形貌为状，形较为一致样品在烧结过程中Bi的多少对样品的铁电性能影响大随着烧结过程中Bi的挥发样品的漏电流明显增大。另外在室温下用VSM磁性测量仪测量样品的铁磁性，样品都具有磁性，Bi含量还对磁性影响。关键词：钙钛矿陶瓷；多铁性；铁电；铁磁 Preparationultiferroic properties of Bi6FeCrTi3O18 samples Abstract: Adopt traditional solid-phase sintering process to prepare Bi6FeCrTi3O18 ceramics which is multiferroic samples of bismuth layer perovskite with metal oxide. Use X-ray diffraction (XRD) to measure, the XRD spectra of samples under different conditions to analysis the micro-structure the of the samples and from the XRD measurement we can see that when under appropriate sintering conditions, we can prepare single-phase Bi6FeCrTi3O18 ceramics of 5 layers-perovskite structure. Observe the Cross-section of the samples by scanning electron microscopy (SEM) observation and the SEM results show that the morphology of the crystalline of the sample is of piease structure and the shape is comparatively consistent. At room temperature (RT), the ferroelectric of the sample was measured，we find that the content of Bi has a great influence to ferroelectrics. With the volatilization of Bi during the sintering process，the leaking current of the sample is increasing. he magnetic properties were measured by vibrating sample magnetometer (VSM), the samples was the magnetic properties at RT. Keywords：erovskite; Ceramic；Multiferroics; Ferroelectrics; Ferromagnetic 目录 一、 绪论 (一) 铁电性·························································································································5 1.1.铁电材料·························································································································5 1.2.电滞回线························································································································5 (二) 铁磁性·············································