Production of Nanometric Bi4Ti3O 12 Powders: from Synthesis to Optical and Dielectric Properties

This paper aims to evaluate the synthesis and annealing parameters for production of nanometric Bi4Ti3O12 and its properties. The powders were obtained through the solution combustion route and the impacts of annealing temperature on the materials’ physicochemical features as well as their optical and electrical properties were investigated. Thus, the prepared powders were annealed at 600ºC, 700ºC and 800ºC and then characterized by several techniques. The results demonstrated that the combustion method was effective for production of nanocrystalline powders with high levels of purity. A trend for particle and crystallite growth was observed as the calcination temperature increased. X-Ray, HRTEM and Raman spectroscopy confirmed the crystalline nature of the powders, whereas impedance spectroscopy demonstrated a reduction of electrical resistance according to the calcination temperature applied. Optical properties were not highly influenced by annealing. The temperature of 600ºC was appropriate to produce crystalline particles with desirable low sizes for application.

本研究旨在评估用于制备纳米级钛酸铋（Bi4Ti3O12）的合成与退火工艺参数，并考察其相关性能。研究采用溶液燃烧法制备粉体，同时探讨了退火温度对材料理化特性、光学及电学性能的影响。据此，将制备得到的粉体分别在600℃、700℃及800℃下进行退火处理，随后通过多种表征技术对其进行分析。结果表明，溶液燃烧法可有效制备高纯度纳米晶粉体。随着退火温度升高，粉体颗粒与微晶尺寸均呈现增长趋势。X射线（X-Ray）、高分辨透射电子显微镜（HRTEM）及拉曼光谱（Raman spectroscopy）证实了粉体的晶态结构，而阻抗谱（impedance spectroscopy）测试结果显示，随着退火温度升高，粉体的电阻呈降低趋势。退火处理对粉体的光学性能未产生显著影响。600℃的退火温度适宜制备出结晶度优异且尺寸符合应用需求的粉体。