本文对YBFO体系掺杂Ca,获得（Y1-xCax）Ba2Fe3O8＋w（YCBFO,x=0,0.05,0.10,0.20）相,通过X射线粉末衍射、扫描电子显微镜等方法,研究YBFO体系内掺入Ca之后,对YBFO的晶体结构、晶胞参数等方面的影响.研究结果表明：对YBFO体系内掺Ca,Ca进入Y位,是空穴型掺杂,这种掺杂并不改变YBFO的P4/mmm空间群的四方晶系结构,仅使其晶胞参数a、c减小.其中,a减少的原因是Fe（2）-O2及Fe（1）-O3键矩的缩短,而c减少的原因是系统内氧的减少.
A series of phase pure samples of（Y1-xCax）Ba2Fe3O8＋w（YCBFO,x=0,0.05,0.10,0.20） is synthesized and the Ca doping effect on the crystal structure of YBa2Fe3O8＋w（YBFO） is studied with XRD and SEM.The results show： Ca substitution for Y in YBFO is cavity-doping,which does not change the tetragonal structure of P4/mmm space group,but makes unit cell parameters a,c decreased.It is argued that unit cell parameter a is reduces by shortening bond distance of Fe（2）-O2 and Fe（1）-O3 whereas the unit cell parameters c is shortened by decreasing oxygen atoms in the system.
参考文献
| [1] | A.K. Azad;A.K.M. Zakaria;F.U. Ahmed .Room temperature, low temperature and polarized neutron studies of YSr_(2)Fe_(3)O_(8)[J].Journal of Magnetism and Magnetic Materials,2000(3):251-257. |
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