STRUCTURE DETERMINATION OF LISICON SOLID-SOLUTIONS BY POWDER NEUTRON-DIFFRACTION

The structures of Li//3Zn//0//. //5GeO//4 and Li//3//. //5Zn//0//. //2//5GeO//4 have been determined by powder neutron diffraction studies at room temperature. Both compounds are members of the LISICON solid solution series Li//(//2// plus //2//x//)Zn//(//1// minus //x//)GeO//4 where minus 0. 36 less than equivalent to x less than equivalent to 0. 87. The basic structure of both compounds consists of an oxide ion array that is intermediate between hexagonal close packing and tetragonal packing, with Ge, Zn, and Li located in tetrahedral sites between the oxide ions.