Extended X-Ray Absorption Fine Structure Study of Local Structure and Atomic Correlations of Tellurium Nanoparticles

Abstract

Extended x-ray absorption fine structure measurements were performed on trigonal tellurium (t-Te) and tellurium nanoparticles in very thin films. Twofold coordinated chains, much like those in t-Te, exist even in the nanoparticles, but covalent bonds or intrachain interactions are stronger than those of t-Te as shown by a shorter bond length and higher Einstein temperature. The interchain coordination number of the nanoparticles is about half that of t-Te, suggesting reduction of interchain interactions.

Large atomic disorder in nanostructured LaNi5 alloys: A La L3-edge extended X-ray absorption fine structure study

“…These results are consistent with the information derived from the Ni K-edge EXAFS data for the same system [11]. In fact, such an increase in atomic disorder, as evidenced by the enhanced Debye Waller factors in the EXAFS measurements, seems to be typical of several nanoparticle systems [8,10,12,15,13,14].…”

“…Incidentally, such a damping is known to occur in several systems when the bulk is nanostructured. For example, Au, Cu, Ni and Te nanoparticles [8,9,10], nanocrystalline Fe prepared by ball-milling [12], substrate free Pd nanoparticles prepared by evaporation [15] and Ge [14] and Pt [13] nanoclusters synthesized by ion implantation etc. are found to show a systematic damping of the EXAFS oscillations compared to the bulk.…”

“…EXAFS is a site selective method, providing information on the local atomic distribution around a selected absorbing atom through photoelectron scattering [7]. Recently, this technique has been extensively used for the local structure studies of several nanomaterial systems [8,9,10,11,12,13,14,15]. Here, we have exploited the La L 3 -edge EXAFS spectroscopy to make a systematic study of the local structure around the La atom, by measuring a series of LaNi 5 samples, where the particle size is varied through ballmilling.…”

Identification of Mn Site in BaTiO3by Synchrotron X-Ray Absorption Spectroscopy Measurements

“…In addition, the EXAFS measurement allows the identification of the nearest neighboring atoms to the absorbing atom to determine the coordination environment for the metal of interest [26]. Recently, both techniques have been successfully applied to various classes of materials to obtain their local structures [27][28][29][30][31][32][33][34][35]. Our previous experimental and theoretical works on applying the XAS techniques to determine the local structure of PZT-based materials have already been established [36][37][38].…”

Structural and thermal investigations of an amorphous GaSe9 alloy using EXAFS, cumulant expansion, and reverse Monte Carlo simulations

“…Many investigations based on this method have been done, and information about static (or structural) disorder, thermal disorder, thermal expansion, anharmonicity effects, and vibrational anisotropy was obtained. 40,[45][46][47][48][49][50][51] The main point is that EXAFS is sensitive to the parallel and perpendicular correlated mean-square relative displacement 52,53 (MSRD ∥ and MSRD ⊥ , respectively) and to the asymmetry of the onedimensional effective pair potential. 54,55 This feature can be exploited to furnish structural and thermal information related to the alloys under study.…”