用电弧熔炼法合成了系列化合物rEgASI（rE＝lA，CE，Pr，nd，SM，gd，Tb，dy），采用粉末X射线衍射方法测定了化合物SMgASI的晶体结构，获得其晶体学及结构修正参数为：四方晶系，lAPTSI类型，（109）I41Md，Mr＝2500，A＝04134（3）nM，C＝1422（2）nM，V＝02430（5）nM3，z＝4，dX＝6464g·CM-3，f（000）＝428，T＝296k。同时还测定了其他化合物的晶胞参数。化合物结构主要表现为gASI的共价结合并形成三维网络，经典极限情况下结构式可表达为rE3＋gA2-SI1-，为金属性zInTl化合物。原子的“配位数”遵从配位环境规律，化合物的晶胞参数遵循正常镧系收缩规律The eight title compounds were synthesized by arcmelting method and their crystal structures were characterized by Xray powder diffraction method.Crystallographic and refined structure parameters of SmGaSi are obtained as follows: Mr=2500, tetragonal, LaPtSitype, (109)I41 md, a=04134(3) nm, c=1422(2) nm, V=02430(5) nm3, Dx=6464 gcm-3, F(000)=428, T=296 K.The unit cell parameters for other compounds were obtained and showed normal lanthanide contraction.The main structure feature is covalent bonded GaSi three dimensional network.The formula might be written as RE3+Ga2-Si1- in the classical limit and the compounds were referred as metallic Zintl phase.The atom coordinations in the compounds follow the general coordination enviroment rule for multinary intermetallic compounds.国家自然科学基金;国家教委优秀年轻教师基
