化学学报 ›› 2004, Vol. 62 ›› Issue (2): 165-169. 上一篇    下一篇

研究论文

混合价多硒代锗酸盐K2Ge4Se8的固相合成、晶体结构和反射光谱研究

王桂花1, 魏永革2, 舒桂明3, 张丽丹1, 郭洪猷1, 王平1   

  1. 1. 北京化工大学理学院, 北京, 100029;
    2. 北京大学化学与分子工程学院, 北京, 1000871;
    3. 北京大学地球与空间科学学院, 北京, 1000871
  • 投稿日期:2003-06-25 修回日期:2003-09-15 发布日期:2014-01-26
  • 通讯作者: 王平,E-mail:guohy@public.fhnet.cn.net E-mail:guohy@public.fhnet.cn.net
  • 基金资助:
    分子动态与稳定结构国家重点实验室资助项目.

Solid State Synthesis, Crystal Structure and Reflectance Spectra of K2Ge4Se8

WANG Gui-Hua1, WEI Yong-Ge2, SHU Gui-Ming3, ZHANG Li-Dan1, GUO Hong-You1, WANG Ping1   

  1. 1. College of Sciences, Beijing University of Chemical Technology, Beijing 100029;
    2. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871;
    3. School of Earth and Space Sciences, Peking University, Beijing 100871
  • Received:2003-06-25 Revised:2003-09-15 Published:2014-01-26

采用反应性熔盐法以n(K2Se3):n(Ge):n(Se)=2:1:6的摩尔比,在773 K下反应5 d,得到一种新的混合价硒代锗酸盐,K2Ge4Se8.该晶体属于单斜系,空间群为P21/c,晶胞参数a=0.73752(5) nm, b=1.2239(2) nm, c=1.7468(4) nm, β=96.02(3)°, V=1.5680(5)nm3, Z=4.偏差因子R1=0.0643, wR2=0.1547. K2Ge4Se8晶体具有层状结构,二维的 2[Ge4Se8]2-层负离子和K+正离子堆积而成,层与层按ABAB排列.K2Ge4Se8属于Zintl型化合物,属于半导体,反射光谱法测定的光学能隙(Eg)为1.8 eV.

关键词: 硒代锗酸盐, K2Ge4Se8, 反应性熔盐法, 晶体结构

A novel ternary metal selenide,K2Ge4Se8,bipotassium octaseleno-tetragermanate was synthesized employing the molten-salt reaction in a molar ratio of n(K2Se3):n(Ge):n(Se)=2:1:6 at 773 K for 5 d.The crystal crystallized in the monoclinic space group P21/c with the unit cell parameters a=0.73752(5)nm,b=1.2239(2)nm,c=1.7468(4)nm,β=96102(3)°,V=115680(5)nm3,and Z=4.K2Ge4Se8 has a layered crystal structure containing two-dimentional networks,2[Ge4Se8]2- anions separated by K+ cations.The layers are packed in a sequence,ABAB,in the crystal.A reflectance spectroscopy study revealed the nature of semiconductor with an energy gap of 1.8 eV for the title compound.

Key words: bipotassium octaseleno-tetragermanate, K2Ge4Se8, reactive molten salt method, crystal structure