Preparation and physical properties of the solid solutions Cu1+xMn1−xO2 ()

In situ high-temperature X-ray and neutron diffraction of Cu–Mn oxide phases

“…The in situ high-temperature X-ray measurements of CuMnO 2 did not detect monoclinic symmetry at the temperatures up to 1150°C. Apparently, the monoclinic distortion found by Trari et al [8] was a consequence of quenching, leading to decreased cell symmetry. The distortion could be caused by the presence of Jahn-Teller ions, e.g., Mn 3?…”

“…This is consistent with the results of Trari el al. [8]. Liquid phase should also exist above this temperature, but cannot be detected by XRD.…”

“…Trari et al [8] proposed that above 1150°C, the following reaction occurs: Table 3. CuMnO 2 disappeared and the single spinel phase remained at temperatures above 1125°C.…”

“…Copper-manganese oxides, Cu x Mn 3-x O 4 ,C u 1-x Mn 1?x O 2 , have interesting physical and catalytic properties [1][2][3][4][5][6][7][8]. For example, Cu-Mn oxide-based catalysts were proposed for the removal of air pollutants like carbon monoxide and nitrous oxides from exhaust gas [3,9].…”

“…At 1060 ± 10°C, the delafossite structure was reported to decompose. Trari et al [8] reported that solid solutions of Cu 1?x Mn 1-x O 2 have monoclinic crednerite structure (space group C2/m), and a very narrow composition range (0.1 B x B 0.15).…”