The self-assembly of DyF3 nanoparticles synthesized by chloride-based route

A study of the size and clustering effects of DyF3 samples

“…Apparently, their arrangement relative to each other in such a way that the easy magnetization axes of the particles are oriented predominantly in the same direction is energetically favorable. This fact is in good agreement with the TEM images of DyF 3 nanoparticles presented in an article by Alakshin et al 12 Fig. 4 The field dependence of DyF 3 powder (7 μm × 5 μm) magnetization (dotsexperiment; solid lineuniform averaging; and dashed linesimulations along the axes of the crystal lattice).…”

“…This fact is in good agreement with the TEM images of DyF 3 nanoparticles presented in an article by Alakshin et al . 12…”

“…As the particle size decreases, the surface layer begins to play an increasingly important role in the magnetic properties of the sample. It was known that for a single crystal DyF 3 the temperature of ferromagnetic ordering is 2.55 K, 7 for a microsized powder DyF 3 it is 2.54 K, 11 and for the particle size of 16-18 nm and 5 nm, the ferromagnetic phase transition was not observed down to a temperature of 1.8 K. 11,12 Recent studies have shown that with a decrease in the average particle size from 225 nm to 28 nm, the T C shifts from 2.45 K to 2.12 K according to a power law. 10 From the finite-size-scaling theory the diameter of nanoparticles d 0 = 1.2 nm was determined, at which the transition to the ferromagnetic state becomes impossible.…”

“…Dysprosium trifluoride nanoparticles tend to self-assembly. 12 Particles with a size of 5 nm are collected into microsized agglomerates with a size of 1 × 0.3 μm. Each agglomerate consists of 5 nm thick chains.…”

Size effect of DyF3 nanoparticles on Curie temperature

“…13,14,25,26 Previously, DyF 3 nanoparticles were synthesized using a chemical reaction in which dysprosium nitrate and dysprosium chloride were used as a precursor, sodium fluoride was used as a source of fluorine, and the microwave treatment in a microwave oven was used as a modification of the synthesis. 27,28 In this study, we varied the size by autoclaving the solution (hydrothermal synthesis). As with most chemical reactions, temperature is a key factor in determining the outcome of a hydrothermal synthesis of nanoparticles.…”