High-Pressure Studies of Cs2CuCl4 and Cs2CoCl4 by X-Ray Diffraction Methods

Magneto‐Structural Properties of the Layered Quasi‐2D Triangular‐Lattice Antiferromagnets Cs2CuCl4−xBrx for x = 0, 1, 2, and 4

“…From the pressure dependence of T max , respectively T s , for the various compounds, and the corresponding d J c /d p values, we can determine the magnetoelastic coupling constants defined as , where ϵ V = Δ V / V denotes the volume strain and the bulk modulus. By using GPa for Cs 2 CuCl 4 as a reasonable approximation also for the Br‐substituted compounds, we obtain values of (5.7 ± 0.4) K for Cs 2 CuCl 4 and (4.4 ± 0.8) K for Cs 2 CuCl 3 Br 1 . For Cs 2 CuCl 2 Br 2 , where we take the pressure dependence of the shoulder in χ mol ( T , p ) for the determination of d J c /d p , we find K. These magnetoelastic coupling constants, determined directly from measurements under hydrostatic pressure, are comparable to the values K derived from ultrasonic measurements on Cs 2 CuCl 4 , where ϵ L denotes the strain induced by the longitudinal modes c 11 and c 33 .…”

“…For the discussion of the magneto‐structural correlations in the compounds of Cs 2 CuCl 4− x Br x (0 ≤ x ≤ 2) it is useful to recall the results of structural investigations under pressure, so far available only for the x = 0 border compound. According to these X‐ray studies, performed up to 4.0 GPa, the structure stays orthorhombic, space group Pnma , up to 3.6 GPa with reduced lattice parameters compared to those at ambient pressure …”

“…As an experimental tool, we use magnetic susceptibility measurements combined with hydrostatic (He‐gas) pressure. The data will be analyzed by taking into account structural data under pressure, available for Cs 2 CuCl 4 …”

High-Pressure Phase Transition in Cs2KMnF6

“…The value of the bulk modulus for Cs CuCl is 15.0(2) GPa (Xu et al (12)), and for common Cs halides bulk moduli lie in the range 13 to 18 GPa (Hazen and Finger (13)). The rigid three-dimensional ReO type of octahedral network in Cs KMnF , formed by alternating corner-sharing KF and MnF octahedra, o!ers an obvious explanation for the lower compressibility.…”

Snap‐Shots of a Reduction Pathway: The Reaction of WCl6 with Copper Powder

“…These values appear shorter than in other compounds with Cu + ions in tetrahedral surroundings such as in Cu[W 6 CCl 18 ] [ d Cu–Cl = 2.387(1) Å], CsCu 2 Cl 3 [ d Cu–Cl = 2.382(1) Å], and [N(CH 3 ) 4 ][Cu 2 Cl 3 ] [ d Cu–Cl = 2.406(1) Å] . At the same time these distances are longer than those reported for Cu 2+ ions in compounds such as Cs 2 CuCl 4 [ d Cu–Cl = 2.205(2) Å], [(CH 3 ) 4 N] 2 [CuCl 4 ] [ d Cu–Cl = 2.243. (1) Å], and (C 7 N 3 H 14 ) 2 [CuCl 4 ] [ d Cu–Cl = 2.251(2) Å]…”