Nanoparticles of MnAs and related ternary or quaternary materials are potentially interesting materials for magnetic recording and/or refrigeration because of the large magnetocrystalline anisotropy inherent in the structure (enabling coercivity to be retained at small particle sizes for single-bit recording) and the presence of a size-tunable magnetostructural transformation (enabling the extent of heat release/uptake and the operable temperature range to be adjusted).  These properties are dependent on the presence of dopants and/or the composition of the solid-solution.  In this presentation, the correlation of particle size with the concentration of inadvertent P-doping will be described along with the consequences for the magnetostructural phase transition.  Subsequently, a synthetic study of the mechanism by which dopants are incorporated, and the extent to which they can be intentionally introduced, will be described for the anionic (P, Sb substitution) and cationic (Fe substituion) sublattices.  Finally, the chemical attributes of arsenides relevant to the tendency toward phase-separation vs. solid solution formation (or dopant inclusion), and the prospects for synthetic control, will be discussed.

Building solids from the bottom-up: Control of doping, phase separation, and solid-solution formation in transition metal arsenide nanoparticles

246th National Meeting (2013)

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