In CO2 methanation, spinel phases are often considered as undesirable leading to deactivation. However, they can also be well-dispersed solid solutions suitable catalyst precursors the formation of highly active and finely dispersed sites. Though, spinels such NiAl2O4, which form when Ni/Al2O3 supported catalysts used, require high reduction temperatures become active. To obtain a precursor, re...

CoxFe3–xO4(CFO)/Pt bilayers prepared by molecular beam epitaxy were investigated for the anomalous Hall effect and X-ray magnetic circular dichroism (XMCD). We found that originates from a proximity at CFO/Pt interface. The XMCD signal in Pt L-edge was obtained only sample deposited 600 °C, indicating is sensitive to interface structure. Transmission electron microscopy images of measurements C...

This paper reports a simple and novel process for preparing nano-granular Zn(x)Fe(3-x)O(4) ferrite films (0 </= x </= 0.99) on Ag-coated glass substrates in DMAB-Fe(NO(3))(3)-Zn(NO(3))(2) solutions. The deposition process may be applied in preparing other cations-doped spinel ferrite films. The Zn content x in the Zn(x)Fe(3-x)O(4) films depends linearly on the Zn(2+) ion concentration ranging f...

Arsenate (As5+) substitution in the hydroxylapatite structure was examined using a combination of crystallographic and spectroscopic techniques. Samples of hydroxylapatite, the As5+-substituted analog (synthetic johnbaumite), and five intermediate compositions were synthesized from solution. Synchrotron X-ray diffraction data show that all samples are single-phase, confirming complete substitut...

Nanoparticles of CoGdxFe2 ? xO4 (x = 0%, 25%, 50%) synthesized via sol–gel auto combustion technique and encapsulated within a polymer (Eudragit E100) shell containing curcumin by single emulsion solvent evaporation were formulated in this study. Testing nanoparticles was carried out using different characterization techniques, to investigate composition, crystallinity, size, morphology, surfac...

Spinel ferrites (NixFe3-xO4; x = 0.25, 0.5, 0.75 and 1.0) have been prepared at 550ºC by egg white auto-combustion route using characterized physicochemical (TGA, IR, XRD, SEM) electrochemical (CV Tafel polarization) techniques. The presence of characteristic vibration peaks in FT-IR reflection planes XRD spectra confirmed the formation spinel ferrites. oxides were transformed into oxide film o...