PbFe_(12)O_(19)在高压下的结构行为（英文）  

Structural Behavior of PbFe_(12)O_(19) under Pressure

作　　者：张庆华[1] 王敏[2] 谭国龙[2] 孔盼盼[1] 李延春[3] 李晓东[3] 刘景[3] 靳常青[1] 禹日成[1] 

机构地区：[1]中国科学院物理研究所,北京100190 [2]武汉理工大学,湖北武汉430070 [3]中国科学院高能物理研究所,北京100049

出　　处：《高压物理学报》2015年第5期363-368,共6页Chinese Journal of High Pressure Physics

基　　金：The National Basic Research Program of China(2012CB932302);The National Natural Science Foundation of China(11174336)

摘　　要：用原位角散X射线衍射实验装置研究了PbFe12O19在55.3GPa压力以下的结构行为。通过拟合29.2GPa以下的晶格参数随压力的变化得到线性压缩率Ba0=997(38)GPa,Bc0=556(22)GPa和体弹模量B0=254(8)GPa。线性压缩率的各向异性可归因于PbFe12O19的层状堆垛结构,其较大的体弹模量可归因于致密的原子排列和较低的c/2a比。另外,在42.7GPa以上常压结构演变为另一种结构,卸压至32.3GPa以下时恢复到原来结构。This work investigated the structural behavior of PbFe12O19 under high pressure by in situ angular dispersive X-ray diffraction（ADXD）measurements up to 55.3GPa.The linear incompressibility Ba0=997（38）GPa and Bc0=556（22）GPa,and bulk modulus B0=254（8）GPa are obtained by fitting the Birch-Murnaghan equation of state with the unit-cell parameters versus pressure below 29.2GPa.The anisotropic incompressibility can be attributed to the layered-stacking structure of PbFe12O19;the relative stiffness of PbFe12O19 can be ascribed to the dense atomic arrangement and the decreasing c/2aratio.In addition,the ambient structure evolves to another structure above 42.7GPa under compression and recovers below 32.3GPa during releasing of pressure.

关 键 词：压缩率 压力导致的相变 PbFe12O19 

分 类 号：O521.23[理学—高压高温物理]