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Bhide, V. G.; Kandpal, M.C.

doi:10.1103/physrevb.20.85

Cited by 11 publications

(1 citation statement)

References 21 publications

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“…The primary manifestation of the slow dynamics is a motion of the particle as a whole within embedding matrix. For dense and highly viscous matrix one can exclude Brownian motion and describe motion by the jump diffusion mechanisms leading to the phase modulation of the absorbed radiation instead to the Doppler modulation being primary effect for the Brownian motion at the space-time scales considered 23 . Under assumption that the motion is locally isotropic one can distinguish two major mechanisms for the absorption line broadening.…”

Section: Particle Motionsmentioning

confidence: 99%

Dynamics of Ternary Cu–Fe–S₂ Nanoparticles Stabilized by Organic Ligands

et al. 2017

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Chalcopyrite-type (Cu-Fe-S 2 ) ternary nanocrystals stabilized by long aliphatic chain ligands could be considered as isolated hard nano-objects dispersed in soft network of organic ligands. The main attention was paid to the behavior of the particles whose average size was varied in a controllable manner from 3 to 20 nm. Dynamics of nanoparticles was studied by applying Mössbauer spectroscopy. The fast dynamics could be described by two-level environment. Deeper level (atomic) was practically the same as for bulk material except Debye temperature, but the higher level (particle motion) was described by the classical harmonic oscillator with the spring constant dramatically softening with increasing temperature. Such behavior led to fast decrease of the fraction detectable by Mössbauer spectroscopy with increasing temperature. The induced internal oscillations within particle by surrounding thermal bath additionally contribute to the shift of measured spectra. Slow dynamics was characterized by the thermally driven overdamped harmonic oscillator motions. In addition, the long range-like diffusion of particles was seen. No significant rotation of particles was found within the accessible temperature range.

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Section: Particle Motionsmentioning

confidence: 99%