Local structure and bonding in tin nanoparticles probed by temperature-dependent EXAFS
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2025-10-24 |
| Journal | Journal of Physics Condensed Matter |
| Authors | Hiroyuki Ikemoto, Takafumi Miyanaga, Shuki Tokuchi |
| Institutions | Hirosaki University, University of Toyama |
Abstract
Section titled āAbstractāAbstract Tin nanoparticles (n-Sn) are expected to undergo a phase transition between Ī± -Sn (a semiconductor with a diamond structure) and Ī² -Sn (a metal with a tetragonal structure) as a function of particle size, similar to the temperature-induced transition that occurs near room temperature. X-ray absorption fine structure measurements were conducted to identify the local structure and extract detailed structural parameters of n-Sn with a diameter of 24.7 Ć . The nearest-neighbor atomic distance suggests that the local configuration of n-Sn resembles the diamond-like structure of Ī± -Sn. However, several experimental observations have indicated that n-Sn does not adopt a perfect diamond structure like that of Ī± -Sn, but rather exhibits an amorphous character. These observations include a decrease in the coordination number, an increase in the static component of the mean-squared relative displacement of the first atomic correlation, and the disappearance of all atomic correlations beyond the nearest-neighbor. Furthermore, the covalent bonds in n-Sn elongate with increasing temperature, in contrast to those in Ī± -Sn which exhibits no temperature dependence. The covalent bond strength of n-Sn was also found to be weaker than that of Ī± -Sn.