Investigation of the electronic structure of the cubic spinel Cu1.2Mn1.8O4 using electron energy loss spectroscopy

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

“…Symbols of 'Dubrovina' and 'DubrovinaQ' in the figures mean the data from in situ and room temperature measurements based on quenched samples [15]. It can be seen that the cation distributions from Maunders et al [31], Dubrovina et al [15], Radhakrishnan and Biswas [22], and Vandenberghe et al [23] matched with ours better than others. Although the cation distributions in CuMn 2 O 4 from Vandenberghe et al [23] and Radhakrishnan and Biswas [22] are consistent with each other, the ionic configurations they proposed are quite different (Table 6 ½ at 895°C (Table 4).…”

“…Clearly, the site exchange based on Eq. 2 during quenching is not significant as the cation distribution from quenched samples was similar to the in situ diffraction measurements in some cases [15,22,23,31], but the crystal symmetry may change with temperature or composition. Dubrovina et al [15] stated that the competing cooperative effects of the Jahn-Teller ions on tetrahedral and octahedral sublattices play a decisive role in determining the structure of the spinel in the absence of thermal disordering.…”

Quantification of the Ti oxidation state in BaTi1−xNbxO3 compounds

“…Considering the potential uncertainty of the exact energy position of each spectrum, our fitting program allows the reference spectra to shift in the energy scale to obtain the best fit. This linear profile fitting method has demonstrated excellent agreement for the Mn (Cu 1.2 Mn 1.8 O 4 ) system [21], which lies in the middle of the 3d TM series albeit the spectra in that case have fewer fine details.…”

“…1). An outline of the technique can be found in the work of Maunders et al [21] in which the Mn valence fractions were extracted from the Mn-L 2,3 edge in Cu 1.2 Mn 1.8 O 4 . In essence, the process aims to reproduce the fine structure on a mixed valence transition metal L 2,3 edge with reference spectra from reference single valence transition metals or transition metal oxides.…”

Thermodynamics of copper‐manganese and copper‐iron spinel solid solutions

“…For example, Cu‐Mn oxide‐based catalysts have been proposed for the removal of air pollutants like carbon monoxide and nitrous oxides from exhaust gas . Cu x Mn 3− x O 4 spinel has high catalytic performance for steam reforming of methanol, and also exhibits high electrical conductivity . Similarly, spinel ferrites have received recent interest because of their potential application in magnetic and electronic materials, sensors, and catalysts .…”