Synthesis, structures and physical properties of new transition metal fluoroselenides Ba3F2MSe3 (M = Zn, Cd)
Journal of Solid State Chemistry(2022)
摘要
Two new transition metal fluoroselenides Ba3F2MSe3 (M = Zn, Cd) have been successfully synthesized by solid-state reaction. Both compounds adopt the same crystal structure with orthorhombic space group Pnma (No. 62), consisting of an infinite corner-sharing [MSe3]4- anion chain separated by [Ba3F2]4+ cationic chain of the fluorite type. Ba3F2ZnSe3 and Ba3F2CdSe3 show paramagnetic behaviors from 1.8 to 300 K due to the absence of magnetic transition metals. Their Debye temperatures are 170 K and 163 K, respectively, determined from the low-temperature specific heat measurements. The diffuse-reflectance spectroscopy measurements reveal that these new compounds are semiconductors with optical band gaps of 1.80 eV and 1.69 eV for Ba3F2ZnSe3 and Ba3F2CdSe3, which are consistent with the band gaps obtained from the first-principle calculations.
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关键词
Ba3F2ZnSe3,Ba3F2CdSe3,Crystal structure,Semiconductor,Band structure
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