We identify ground-state collinear spin ordering in various antiferromagnetic transition metal oxides by constructing the Ising model from first-principles results and applying a genetic algorithm to find its minimum energy state. The present method can correctly reproduce the ground state of well-known antiferromagnetic oxides such as NiO, Fe2O3, Cr2O3 and MnO2. Furthermore, we identify the gr...

in this study, we synthesis one-dimensional (1d) manganese(iii) schiff base coordination polymer [mn(brsalophen)(μ1,3-n3)]n by reaction of mncl2·6h2o and tetradentate schiff base ligand brsalophen at the presence of nan3 in methanol and characterized by elemental analyses (chn) and ft-ir spectroscopy. it was used as a new precursor to prepare spinel type manganese oxide nanowires by a facile so...

Bipolar resistive switching (BRS) phenomenon has been demonstrated in Mn3O4 using Al (Aluminum)/Mn3O4/FTO (Fluorine doped Tin Oxide) Resistive Random Access Memory (RRAM) device. The fabricated RRAM device shows good retention, non volatile behavior and forming free BRS. Current-Voltage (I-V) characteristics the temperature dependence of resistance (R-T) measurements were used to explore conduc...

Mn3O4 and Mn2O3 were synthesized by potentiostatic electrodeposition from a de-aerated manganese acetate sodium sulfate electrolytic bath, followed annealing. The parameters (including applied potential, precursor concentration, pH, temperature) the thermal treatment conditions investigated to obtain best control over microstructure stoichiometry of oxides. We found that voltage is key paramete...

BACKGROUND A lot of effort has been focused on the integration of nanorods/nanowire as building blocks into three-dimensional (3D) complex superstructures. But, the development of simple and effective methods for creating novel assemblies of self-supported patterns of hierarchical architectures to designed materials using a suitable chemical method is important to technology and remains an attr...

The preparation of a transparent ultra-fine-grained doped ceramics requires homogeneous dopant distribution in matrix. In the present work, two thermodynamical phenomena allowing such (the dissolution and formation undesirable secondary phases) were experimentally theoretically studied. A general thermodynamic-kinetic model was developed for dissolution, which verified experimental conditions u...

In situ measurements of the hydrothermal formation of LiMn2O4 (LMO) nanocrystallites reveal that the reaction progresses in steps, each creating a different crystalline phase. The reaction route is summarized as KMnO4→disordered δ-MnO2→(ordered δ-MnO2)→LiMn2O4→(γ-Mn2O3)→Mn3O4. The phase purity of LMO can be controlled by reaction time and temperature where phase pure LMO is obtained after 150-2...

Surface-enhanced Raman scattering (SERS) as an unequivocal surface-sensitive technique has been considered one of the most powerful tools for identifying molecular species. However, the SERS active substrates have mainly been confined to some research on noble metals such as Pd, Au, Ag and Cu. In the present study, we describe the self-assembly of graphene quantum dots (GQDs) with Mn3O4, and th...

A series of mixed Mn-Zr oxides with different molar ratios Mn/Zr (0.1-9) have been prepared by coprecipitation of manganese and zirconium nitrates and characterized by X-ray diffraction (XRD) and BET methods. It has been found that at concentrations of Mn below 30 at%, the samples are single-phase solid solutions (MnxZr1-xO2-δ) based on a ZrO2 structure. X-ray photoelectron spectroscopy (XPS) m...