固相反应法制备钴掺杂氧化镁传压介质  

Preparation of Cobalt-Doped Magnesium Oxide Pressure-Transmitting Medium with Solid Reaction Process

作　　者：吴京军[1,2] 贺端威 王强[1,2] 张佳威[1,2] 刘进[1,2] WU Jingjun;HE Duanwei;WANG Qiang;ZHANG Jiawei;LIU Jin(Institute of Atomic and Molecular Physics,Sichuan University,Chengdu 610065,China;Key Laboratory of High Energy Density Physics and Technology of Ministry of Education, Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学原子与分子物理研究所,四川成都610065 [2]四川大学高能量密度物理教育部重点实验室,四川成都610065

出　　处：《高压物理学报》2018年第5期58-63,共6页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(51472171);国家自然科学基金重大仪器研制项目(11427810);四川省科技支撑计划(15ZC0946);中国工程物理研究院中子物理学重点实验室课题(2014AB02)

摘　　要：以氧化镁(MgO)和氧化钴(CoO)为初始材料,利用固相反应方法,经8h的混料、200MPa的预压以及在空气氛围下1 200℃的烧结等步骤,成功制备出钴的摩尔分数为9%的氧化镁传压介质(MgO+9%CoO)。采用X射线粉末衍射仪、扫描电子显微镜以及热重分析仪对样品进行表征,结果表明:在烧结过程中混合粉料之间发生了反应,金属离子相互交换,钴离子取代MgO晶格中的部分镁离子,从而形成MgO-CoO固溶体。与目前国产MgO传压介质(MgO+10%Na4SiO4(质量分数))相比,实验制备的钴掺杂MgO传压介质不含杂质,高温高压下更稳定,并且温度发生效率更高。In this study,magnesium oxide(MgO)doped by cobalt(Co)was prepared as pressure-transmitting medium,by solid reaction process.The starting material is a pre-compressed mixture of MgO and cobalt oxide(CoO),which was mixed for 8 h and compressed at 200 MPa,and then treated at 1 200℃.The as-prepared samples were characterized by X-ray diffraction,scanning electron microscopy,and thermogravimetric analysis.The results demonstrate that during the sintering process,the reaction between MgO and CoO was completed and the exchange of metal ions between MgO and CoO leads to a single solid solution phase.Compared to the domestic products(MgO+10wt%Na 4SiO 4),there is no impurity found in Co-doped MgO,which is more stable than the domestic products under high pressure and high-temperature.In addition,the temperature-generation efficiency of the cell assembly with MgO+9mol%CoO as pressure-transmitting medium is also higher than that of the domestic products.

关 键 词：固相反应 高温高压 MgO-CoO固溶体 传压介质 温度发生效率 

分 类 号：O521.2[理学—高压高温物理] O521.3[理学—物理]