Pb_3Mn_7O_(15):合成、相变、转换和分解  

Pb_3Mn_7O_(15):synthesis, phase transition, transformation and decomposition

作　　者：孙鹏[1] 尹从岭[1] 雷秀云[1] 

机构地区：[1]江西理工大学材料科学与工程学院,江西赣州341000

出　　处：《有色金属科学与工程》2017年第1期75-79,共5页Nonferrous Metals Science and Engineering

基　　金：国家自然科学基金资助项目(21301077)

摘　　要：以MnO2和PbO为原料,采用高温固相法合成Pb_3Mn_7O_(15),采用粉末衍射、SEM和EDS技术,系统研究Pb_3Mn_7O_(15)的合成、相变、转换和分解规律.结果表明:在使用粉末合成法制备Pb_3Mn_7O_(15)时,较为合适的合成温度为850℃,PbO过量度为5%.室温下Pb_3Mn_7O_(15)为正交结构,高温下为六方结构,两者在100~200℃之间的相变是可逆的;亚稳相Pb4Mn9O20在800~850℃不可逆的分解产生Pb_3Mn_7O_(15);Pb_3Mn_7O_(15)在950~1000℃之间发生分解,分解产物为晶态Mn_3O_4和非晶态PbO.Pb3Mn7O15was synthesized from MnO2 and PbO via solid-state reaction and the phase transition were discussed systematically.Powder X-ray diffraction, SEM and EDS were used to characterize the samples.The results show that the optimized temperature is 850 ℃ and PbO overdose amount is 5 % for Pb3Mn7O15 synthesis.The phase transition between orthorhombic and hexagonal Pb3Mn7O15100200 ℃ is reversible.The metastable phase Pb4Mn9O20 decomposed into Pb3Mn7O15 at 800850 ℃ irreversibly.Further temperature increase at 950℃ to 1 000 ℃ leads to the decomposition of Pb3Mn7O15.The final product contains crystalline Mn3O4 spinel and non-crystallized PbO.

关 键 词：可逆相变 粉末衍射 锰氧化物 分解 多铁材料 

分 类 号：TF123.23[冶金工程—粉末冶金] TG146.12[冶金工程—冶金物理化学]