The thiophosphates of the rare earths REPS 4(RE=Y, La～Lu) were prepared by solid state reaction. Their unit cell parameters and the structures of HoPS 4, ErPS 4 and TmPS 4 were determined by X ray powder diffra...The thiophosphates of the rare earths REPS 4(RE=Y, La～Lu) were prepared by solid state reaction. Their unit cell parameters and the structures of HoPS 4, ErPS 4 and TmPS 4 were determined by X ray powder diffraction. All REPS 4(RE=Y, La～Yb) crystallize in the tetragonal space group I4 1/acd , a ≈1 1 nm, c ≈1 9 nm, Z =16 . Each RE 3+ is surrounded by eight sulfurs and thus forms a distorted tetragonal antiprism. This kind of structures has significant Van Der Waals′ vacant space with a diameter of about 0 625 nm along c axis and of 0 35 nm along a and b axis. But LuPS 4 crystallizes in a monoclinic structure which is most probably layered. The influence of lanthanide contraction on the stability of the tetragonal REAX 4 structure was studied and a criterion for the existence of the tetragonal structure in the REAX 4 series compounds is proposed. There is 2 4 d A X / r 1 9.展开更多
The magnetic susceptibilities of REPS4(RE=LaYb) compounds series were measured in the temperature range of 2300 K. The variations of the susceptibility and the inverse susceptibility along with the temperature were st...The magnetic susceptibilities of REPS4(RE=LaYb) compounds series were measured in the temperature range of 2300 K. The variations of the susceptibility and the inverse susceptibility along with the temperature were studied for each case. The CurieWeiss constants(C and and the effect moment eff for each paramagnetic RE3+ were obtained by simulating the susceptibility data measured in the temperature range of 50300 K.展开更多
文摘The thiophosphates of the rare earths REPS 4(RE=Y, La～Lu) were prepared by solid state reaction. Their unit cell parameters and the structures of HoPS 4, ErPS 4 and TmPS 4 were determined by X ray powder diffraction. All REPS 4(RE=Y, La～Yb) crystallize in the tetragonal space group I4 1/acd , a ≈1 1 nm, c ≈1 9 nm, Z =16 . Each RE 3+ is surrounded by eight sulfurs and thus forms a distorted tetragonal antiprism. This kind of structures has significant Van Der Waals′ vacant space with a diameter of about 0 625 nm along c axis and of 0 35 nm along a and b axis. But LuPS 4 crystallizes in a monoclinic structure which is most probably layered. The influence of lanthanide contraction on the stability of the tetragonal REAX 4 structure was studied and a criterion for the existence of the tetragonal structure in the REAX 4 series compounds is proposed. There is 2 4 d A X / r 1 9.
文摘The magnetic susceptibilities of REPS4(RE=LaYb) compounds series were measured in the temperature range of 2300 K. The variations of the susceptibility and the inverse susceptibility along with the temperature were studied for each case. The CurieWeiss constants(C and and the effect moment eff for each paramagnetic RE3+ were obtained by simulating the susceptibility data measured in the temperature range of 50300 K.
