Superparamagnetic nickel particles in yttria-stabilized zirconia prepared by reduction of Pechini-derived solution
Source abstract
Abstract
The magnetic behavior of very fine metallic Ni (Ni0) particles dispersed in a matrix of 10 % by mol (m/o) Y2O3-stabilized ZrO2 (10YSZ) was examined. Specimens that nominally contained 0.1, 0.5, and 1 m/o Ni were prepared by a high-purity chemical synthesis method followed by a reduction treatment in H2. A 0.5 m/o Ni specimen was also made by heating in vacuum, within a carbon environment. dc and ac susceptibility measurements revealed the presence of superparamagnetic Ni0 as well as Ni2+. A Stoner–Wohlfarth formulation was applied to determine that the average Ni0 particle size was between 4 and 7 nm, and this was confirmed by transmission electron microscopy. The activation energy for single-domain particle spin reversal and K eff, the effective anisotropy constant, were determined. K eff was higher for the vacuum heat treatment specimen because it contained less residual organic material, and therefore a higher density of Ni0 particles. It is shown that it is possible to make very fine Ni0 particles in YSZ via a direct conversion from Ni nitrates.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Catalytic Processes in Materials Science · Advancements in Solid Oxide Fuel Cells · Magnetic and transport properties of perovskites and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (20)
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