Synthesis, characterization and magnetic properties of complex oxides Ln2Mn2/3Re4/3O7 (Ln=Er, Y) and Y2Zn2/3Re4/3O7

Solid State Transport and Hydrogen Permeation in the System Nd5.5W1–xRexO11.25−δ

“…The deconvolution procedure allows the contribution of the mixture (7+, 6+, and 5+) oxidation states to be accurately distinguished, for the as-sintered sample. The presence of rhenium in different oxidation states has been previously reported in Pt–Re/TiO 2 and Pt–Re/ZrO 2 catalysts that show a mixture of Re 4+ , Re 6+ , and Re 7+ , and the presence of Re 5+ was detected in other mixed oxides. , After reduction at 900 °C the contribution from cations Re 4+ (42.8 eV) becomes more important in agreement with prior reports …”

“…The presence of rhenium in different oxidation states has been previously reported in Pt−Re/TiO 2 and Pt−Re/ZrO 2 catalysts 18 that show a mixture of Re 4+ , Re 6+ , and Re 7+ , and the presence of Re 5+ was detected in other mixed oxides. 19,20 After reduction at 900 °C the contribution from cations Re 4+ (42.8 eV) becomes more important in agreement with prior reports. 21 The binding energies (BEs) of the most prominent XPS transitions (C1s, O1s, Nd3d5/2, Nd4d, W4f7/2, and Re4f7/2) for the sample before and after reduction are presented in Table 2 together with the Re oxidation states relative concentrations.…”

Study of the Influence of Electron Spin in Ferromagnetism and Thermoelectric Characteristics of CdTm2Y4 (Y = S, Se) Spinels for Spintronic Applications

“…In compounds such as Dy 2 Ti 2 O 7 and Ho 2 Ti 2 O 7 , the specific ferromagnetic coupling and spin directions are crucial in generating spin ice properties. These materials exhibit spin orientations that resemble the position of hydrogen atoms in water ice, giving rise to a spin ice-like behavior. − This similarity has attracted significant attention in the study of transition-metal-based spinels like CdFe 2 O 4 and ZnCr 2 O 4 due to their geometric frustration. , Still, the existence of relatively potent spin–lattice couplings within the transition-metal-based materials is frequently directed to a decisive state in which structural transitions and magnetic ordering are coupled. , CdLn 2 S 4 (Ln = Ho, Er, Tm, Yb) and CdLn 2 S 4 (Ln = Dy, Ho) have been registered as suitable semiconductors with band gap equal to or greater than 2 eV according to available experimental data. , …”

“…These materials exhibit spin orientations that resemble the position of hydrogen atoms in water ice, giving rise to a spin ice-like behavior. 13 − 19 This similarity has attracted significant attention in the study of transition-metal-based spinels like CdFe 2 O 4 and ZnCr 2 O 4 due to their geometric frustration. 20 , 21 Still, the existence of relatively potent spin–lattice couplings within the transition-metal-based materials is frequently directed to a decisive state in which structural transitions and magnetic ordering are coupled.…”

First-Principles Simulation of Ferromagnetic CdHo2Y4 (Y = S, Se) Spinels for Energy Storage Applications

“…The spin ice characteristics in materials Ho 2 Ti 2 O and Dy 2 Ti 2 O 7 are due to distinct ferromagnetic couplings and spin direction as that of H position ice. [6][7][8][9][10][11][12][13] A spatial similarity has been observed among the pyrochlore sub-lattice with lanthanide cations and the spinels sub-lattice with octahedral coordination cations. Transition metals-based spinels such as CdFe 2 O 4 and ZnCr 2 O 4 have attained vast attention because of their geometric infuriation.…”