Phonon scattering mechanism in thermoelectric materials revised via resonant x-ray dynamical diffraction

Abstract

Engineering of thermoelectric materials requires an understanding of thermal conduction by lattice and electronic degrees of freedom. Filled skutterudites denote a large family of materials suitable for thermoelectric applications where reduced lattice thermal conduction attributed to localized lowfrequency vibrations (rattling) of filler cations inside large cages of the structure. In this work, a multiwavelength method of exploiting X-ray dynamical diffraction in single crystals of CeFe 4 P 12 is presented and applied to resolve the atomic amplitudes of vibrations. The results suggest that the vibrational dynamics of the whole filler-cage system is the actual active mechanism behind the optimization of thermoelectric properties.

Simultaneous improvement of corrosion and mechanical properties of AA 5083 aluminum alloy

“…89-4037). The sample lattice parameters, as shown in Table 2, are in good agreement with the published values for the α-phase Aluminum FCC structure: a = 4.047 ± 0.01 nm [28,31]. The Scherrer equation [32] was utilized to determine crystallite size and lattice strain from the broadening of X-ray diffraction peaks, which can be represented as…”

“…the increase in crystallite size caused by annealing, atomic rearrangement, and stress relief [29][30][31]. The X-ray patterns of as-received, cold-rolled, and heat-treated α-Al samples are indicative of the FCC crystal structure (JCPDS No.…”