Search

Nanoparticles with a core-shell structure of Si@SiO 2 with an average size of about 50 nm were obtained by plasma chemical synthesis through the decomposition of monosilane. Electrochemical impedance spectroscopy (EIS) was used to study the behavior of anodes based on the composite Si@SiO 2 during the cyclic charge/discharge. Based on the results of Si@SiO 2 anodes studies by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) in conjunction with thermodynamic modeling (TM), assumptions were made about chemical and electrochemical processes occurring during prolonged cycling in the electrolyte 1 M LiPF 6 in ethylene carbonate/diethyl carbonate (1:1 v/v). [ABSTRACT FROM AUTHOR]

Abstract: We review an atomic resolution imaging method based on the analysis of the fine structure in X-ray absorption anisotropy, which results from incident beam diffraction. For a polychromatic X-ray beam, due to the suppression of higher order diffraction fringes, X-ray absorption anisotropy patterns can be interpreted as distorted real-space projections of the atomic structure around absorbing atoms. A qualitative method for analysis of X-ray absorption anisotropy patterns is presented, based on modeling of X-ray patterns with ray-traced images calculated for clusters around absorbing atoms. [Copyright &y& Elsevier]