Structural Features and Functional Properties of Y₂O₃ Reinforced Nickel Matrix Nanocomposites

Abstract

Metal matrix composites with yttria as reinforcement are mostly produced because of it's improved mechanical properties while thermal stability, electrochemical and magnetic properties of the yttria based composites are rarely considered. In the present study, the feasibility of incorporating yttria nanoparticles into nickel matrix from ethylene glycol bath by electro-codeposition method is demonstrated. The particle content of the coatings was strongly influenced by current density i. e. the rate of metal deposition. Particle content, surface morphology and microstructural changes of the deposits were investigated by scanning electron microscope (SEM) equipped with energy dispersed X-ray analyzer (EDAX). A dense, compact and smoother composite surface with lower particle content was obtained at higher current densities. Crystallographic structure, texture and lattice strain have been evaluated using X-ray diffraction (XRD). Incorporation of yttria particles inhibits the grain growth and causes grain refinement of the nickel matrix. Annealed nanocomposite deposits revealed thermal stability up to 700°C. The comparative electrochemical corrosion behavior of the electrodeposited coatings in 3.5 % NaCl solution and their deposition potential were evaluated. Magnetic studies showed nearly complete absence of hysteresis i. e. soft magnetic nature of the coatings.

Heterogeneously Functionalized Electrode Materials for Energy Conversion and Storage Processes

“…As desirable electrode components, rare-Earth metal oxide (REMOs) or its hydroxides that have multiple oxidation states and a 4 f electronic configuration have attracted particular attention. 109 In particular, yttrium oxide (Y₂O₃) could be better electrodes for SCs due to its cost-free, nontoxicity, and oxygen vacancy easily formed and removed. Y₂O₃) has a ground state valence of Kr 4d 1 5s 2 and, therefore, forms a stable Y (III) is generated after losing an additional electron.…”