填充式skutterudite化合物:Ba_yFe_xCo_(4-x)Sb_(12)的多步固相反应合成及结构  

SOLID STATE REACTION SYNTHESIS AND STRUCTURE OF FILLED SKUTTERUDITE COMPOUNDS Ba_yFe_xCo_(4-x)Sb_(12)

作　　者：唐新峰[1] 陈立东[1] 後藤孝[1] 平井敏雄[1] 袁润章[2] 

机构地区：[1]日本东北大学金属材料研究所 [2]武汉理工大学材料复合新技术国家重点实验室,武汉430070

出　　处：《物理学报》2000年第11期2196-2200,共5页Acta Physica Sinica

摘　　要：以Ba为填充原子 ,在x =0— 3 0 ,y=0— 0 7的组成范围内 ,用多步固相反应法合成了单相BayFexCo4 -xSb12 化合物 .用Rietveld方法对结构的精确化结果表明 :合成的BayFexCo4 -xSb12 化合物具有填充式skutterudite结构 ,Ba的热振动参数 (B)比Sb,Fe/Co的大 ,表明在BayFexCo4 -xSb12 化合物中Ba具有扰动效果 .晶格常量随Ba填充分数及Fe含量的增大而增大 .在BayFexCo4 -xSb12 化合物的Sb的 2 0面体空洞中 ,Ba的最大填充分数随Fe含量的增大而增大 ,并明显地大于Ce的填充分数 .当Fe含量从 0增大到 4 0时 ,Ba的最大填充分数从 0 35增大到 1Ba y Fe x Co 4-x Sb 12 ( x =0—3 0, y =0—0 7) were synthesized by a two\|step solid state reaction method. The results of Rietveld refinement demonstrated that Ba y Fe x Co 4-x Sb 12 synthesized possesses a filled skutterudite structure. The filling fraction of Ba obtained by Rietveld refinement agreed well with the composition obtained by inductively coupled plasma emission spectroscopy. Thermal parameters ( B ) of Ba was larger than that of Sb, and Fe/Co, indicating that Ba “rattles”in Sb\|icosahedron voids. The lattice constants of Ba y Fe x Co 4-x Sb 12 increased with increasing Ba filling fraction and Fe content. The maximum filling fraction of Ba ( y max ) in Ba y Fe x Co 4-x Sb 12 increased with increasing Fe content, and was found to be rather greater than that of Ce of La in Ln y Fe x Co 4-x Sb 12 . The y max varied from 0 35 to near 1 0 when Fe content ( x ) changed from 0 to 4 0.

关 键 词：skutterudite化合物 固相反应 热电转换材料 

分 类 号：O73[理学—晶体学]