Mg-Fe电气石氧化/还原热处理  

Heat treatment of Mg-Fe tourmaline in oxidation /reduction atmosphere

作　　者：王平[1] 李学帅[1] 周小美[1] 黄新 李之锋[1] 吴速英[1] 

机构地区：[1]江西理工大学材料与化学工程学院,江西赣州341000 [2]赣州托玛琳环保科技有限公司,江西赣州341000

出　　处：《材料热处理学报》2010年第12期8-13,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然基金项目(41062002);江西赣州科技局项目([2007]-25)

摘　　要：通过Mg-Fe电气石粉体在～800℃氧化/还原气氛热处理,得到电气石白度、Fe2+含量、负离子释放量、结构变化规律。氧化热反应过程中,认为O原子发生Frenkel Defect和"反Schottky Defect"并存,使得FeO→Fe2O3;还原反应过程中,O原子主要发生Schottky Defect效应,使得Fe2O3→FeO。通过模拟结构,设置极性基团[Na,Ca]/[Si-O4]6/[Fe2+,Mg-O6]3与电偶极矩-[Al,Fe3+-O6]-链,建立了电气石热释电效应微观机理模型。The whiteness,structure,Fe2 ＋ content and release of negative ions of Mg-Fe tourmaline heat treated in oxidizing/reducing atmosphere were examined by means of XRD,whiteness test,and an ambient air ion meter.In oxidation heating process,the Frenkel defect and＂reverse Schottky defect＂co-exist and transformation of FeO to Fe2 O3 takes place in tourmaline.In reduction heating reaction process,the main effect of Schottky defect occurrs and transformation of Fe2 O3 to FeO takes place in tourmaline.By simulating the structure,the polar groups[Na,Ca]/[Si-O4 ]6/[Fe2 ＋,Mg-O6 ]3 and the electric dipole moment-[Al,Fe3 ＋-O6 ]-chains are set and a micro-mechanism model for tourmaline pyroelectric effect is established.

关 键 词：电气石 热处理 负离子浓度 热释电效应 

分 类 号：TB34[一般工业技术—材料科学与工程]