Synthesis, Crystal Structure, and Magnetic Properties of a Three‐Dimensional Hydroxide Sulfate: Mn₅(OH)₈SO₄

Abstract

A 3D hydroxysulfate, Mn 5 (OH) 8 SO 4 , formed from a mild hydrothermal reaction has been reported. The compound crystallizes in the triclinic system P1 with cell parameters a = 7.5501(5) Å, b = 8.5558(6) Å, c = 8.6059(5) Å, α = 98.122(4)°, β = 102.370(4)°, γ = 99.646(4)°, V = 526.19(6) Å 3 and Z = 2. The crystal structure consists of a 3D framework with channels along the c-axis. In this structure, the manganese atoms in the distorted pentahedra and octahedra are intercon-

Fast Method to Determine Solubility Products of Sparingly Soluble Salts by Combining Titration Experiments and Thermodynamic Modeling: A Case Study on the Example of Cu/Zn Based Catalyst Precursors and Ni/Mn Based Precursors for Cathode Active Material

“…Our hypothesis is that due to a lack of OH – ions, SO 4 2– ions are incorporated into a theophrastite (β-Ni(OH) 2 )-like lattice instead. Similar phases with ratios of hydroxide to sulfate ions of 6 to 10 were reported for Cu and Al (Cu 4 (SO 4 )(OH) 6 ·2H 2 O, Al 4 (SO 4 )(OH) 10 ·5H 2 O) as well as, more recently, for Mn (Mn 5 (OH) 8 SO 4 , Mn 9 (OH) 14 (SO 4 ) 2 ·H 2 O, Mn 4 (OH) 6 SO 4 ).…”

“…Our hypothesis is that due to a lack of OH − ions, SO 4 2− ions are incorporated into a theophrastite (β-Ni(OH) 2 )-like lattice instead. Similar phases with ratios of hydroxide to sulfate ions of 6 to 10 were reported for Cu and Al (Cu 4 (SO 4 )(OH) 6 •2H 2 O, Al 4 (SO 4 )(OH) 10 •5H 2 O) 55 as well as, more recently, for Mn (Mn 5 (OH) 8 SO 4 , 56 Mn 9 (OH) 14 (SO 4 ) 2 • H 2 O, 57 Mn 4 (OH) 6 SO 4 29 ). Compared to the model variant with literature data (NRMSE = 0.1296), a much better agreement between the model and measurement is achieved when applying the model variant based on Ni 8 (OH) 14 SO 4 (NRMSE = 0.0322).…”

Synthesis and Characterization of a New Monometallic Manganese Layered Double Hydroxide with Unique Redox Properties

“…For lower wavenumbers, a strict attribution of the peaks is not straightforward. The band at 555 cm −1 is in line with previous work by Fan et al as well as Salah et al observing a large band slightly above 500 cm −1 [40,37] for Mn 5 (OH) 8 SO 4 and Mn 2 (OH) 2 SO 4 respectively. Then, the evolution of those peaks for increasing x shows the transformation of the solid during oxidation.…”

“…It is interesting to note that on the x = 0 spectrum, one can observe two main bands in the region for the ν 3 vibration of sulfate (1059 and 1119 cm −1 ). This split is similar as the one reported by Fan et al [40] for Mn 5 (OH) 8 SO 4 and can be explained by a anisotropic environment around the sulfate but may be also due to the presence of two different environments for the sulfate [42]. This split disappears at higher x value and only one band at 1067 cm −1 is observed.…”