(1. 山東大學(xué) 材料液態(tài)結(jié)構(gòu)及其遺傳性教育部重點(diǎn)實(shí)驗(yàn)室，濟(jì)南 260061；
2. 山東交通學(xué)院 土木工程系，濟(jì)南 250023)
摘 要: 以化學(xué)計(jì)量比的硝酸鋇、硝酸鐵和檸檬酸為原料采用溶膠−凝膠工藝制備M型鋇鐵氧體納米粉體，通過(guò)XRD、TEM等測(cè)試手段表征粉體的結(jié)晶特性及微觀結(jié)構(gòu)，并研究反應(yīng)機(jī)理以及燒結(jié)溫度、保溫時(shí)間對(duì)晶粒尺寸的影響，結(jié)果表明：粉體的平均晶粒尺寸為40~70 nm，燒結(jié)溫度顯著影響結(jié)晶過(guò)程、晶粒尺寸及其分布；燒結(jié)溫度為
關(guān)鍵字: M型鋇鐵氧體；溶膠−凝膠工藝；結(jié)晶特性；燒結(jié)
barium ferrite nanopowder by sol-gel process
（1. Key Laboratory of Liquid Structure and Heredity of Materials,
Ministry of Education, Shandong University, Ji’nan 250061, China;
2. Department of Civil Engineering, Shandong Jiaotong University,Ji’nan 250023, China）
Abstract:M-type barium ferrite (BaFe12O19) nanopowders were synthesized by a sol-gel process. The crystalline properties and morphologies of the powders were characterized by means of X-ray diffraction (XRD) and transmission electron microscope (TEM). The reaction mechanism and the effects of calcinations temperature and calcinations time on grain size were studied. The results show that M-type barium ferrite powders with the average grain size range of 40−70 nm can be prepared at 800 ℃ and the calcinations temperature has obvious influence on crystalline process, the particle size and its distribution. The as-prepared samples obtained after heat-treatment at 800 ℃ for 0.5 h exhibit that the rod-like particles have a length of about 150−200 nm and a diameter of about 30−50 nm.
Key words: M-type barium ferrite; sol-gel process; crystalline property; calcinations
