Cu9O2(SeO3)4Cl6 revisited: Crystal structure, Raman scattering and first-principles calculations

Observation of a 1/3 magnetization plateau in Pb2Cu10O4(SeO3)4Cl7 arising from (Cu2+)7 clusters of corner-sharing (Cu2+)4 tetrahedra

“…As a result, the formation of single crystals was observed in the cold zone of the furnace. Powder XRD (STOE STADI P diffractometer, Cu K α1 radiation) shows that the crystals were a mixture of PCOSC and Cu 9 (SeO 3 ) 4 O 2 Cl 6 , 3 which can be separated manually. The refined cell constants for PCOSC (monoclinic space group C2/m, a = 18.644( 12 1c, shows that (Cu 2+ ) 7 clusters made up of two corner-sharing (Cu 2+ ) 4 tetrahedra interact with each other and also with (Cu 2+ ) 2 dimers.…”

“…As a result, the formation of single crystals was observed in the cold zone of the furnace. Powder XRD (STOE STADI P diffractometer, Cu K α1 radiation) shows that the crystals were a mixture of PCOSC and Cu 9 (SeO 3 ) 4 O 2 Cl 6 , 3 which can be separated manually. The refined cell constants for PCOSC (monoclinic space group C 2/ m , a = 18.644(12) Å, b = 6.196(3) Å, c = 12.701(7) Å, β = 110.24(4)°, cell volume: 1376.7(17) Å 3 ) were found to be in good agreement with the results of ref.…”

“…For example, type-II multiferroic melanothallite, Cu 2 OCl 2 , possesses a cycloidal magnetic structure compatible with ferroelectric polarization, 2 while chloromenite, Cu 9 O 2 (SeO 3 ) 4 Cl 6 , exhibits successive antiferroelectric and antiferromagnetic transitions being a multiferroic material of type-I. 3 No long-range order has been observed in ilinskite-type KCu 5 O 2 (SeO 3 ) 2 Cl 3 4 and urusovite CuAlAsO 5 5 down to low temperatures, which is due to the presence of a spin gap in their magnetic excitation spectra. Copper selenite chloride, Cu 5 (SeO 3 ) 4 Cl 2 , prepared by chemical vapor transport reactions exhibits long range Néel order with canted moments attributed to the antisymmetric Dzyaloshinskii–Moriya exchange interaction.…”

Constructing the coordination environment of Se–O in Cu2−xSe for electrochemical hydrogen evolution

“…The charge transfer resistances ( R ct ) of the catalysts were also evaluated by electrochemical impedance spectroscopy (EIS). 25–28 As shown in Fig. 3b, Cu 2 O(SeO 3 ) displays the significantly smallest Nyquist semicircle diameter, suggesting the lowest R ct during the HER process.…”

“…The charge transfer resistances (R ct ) of the catalysts were also evaluated by electrochemical impedance spectroscopy (EIS). [25][26][27][28] As shown in Fig. 3b Furthermore, we have performed DFT calculations to correlate the structure and activity.…”