与LaBa_2Cu_3O_(7-δ)相关结构的新相的合成

The New Phases Syntheses of Structures Related with LaBa_2Cu_3O_(7-δ)

LaBa_2Cu_2TiO_(8-δ)和LaBa_2Cu_2ZnO_(7-δ)均是四方晶体,晶格常数分别是a=0.3943nm,c=1.1918nm和a=0.3960nm,c=l.1746nm,经XRD强度的拟合计算确定LaBa_2Cu_2TiO_(8-δ)的Ti优先地占据在Cu2,从而破坏完整的Cu-O面,电学性质均表现为半导体电性。

The crystal structures of LaBa_2Cu_2Tio_(8-δ)and LaBa_2Cu_2ZnO_(7-δ) are indexed in tetragonal unit cellwith dimensions which are a=0.3934nm,c=1.1918nm and a=0.3960nm,c=1.1746nm respectively.We have proved that Ti ion occupies the Cu2 site preferentially by calculation of XRD peak intensi-ty of LaBa_2Cu_2TiO_(8-δ).R--T curve shows that both compounds are semiconductors.