Portal de Periódicos da CAPES

Structure of Undercooled Liquid Pd Probed by X-Ray Absorption Spectroscopy

1999; American Physical Society; Volume: 83; Issue: 3 Linguagem: Inglês

10.1103/physrevlett.83.560

1092-0145

A. Filipponi, Andrea Di Cicco, Simone De Panfilis,

Thermodynamic and Structural Properties of Metals and Alloys

We report x-ray absorption spectra of high temperature solid Pd at 1770 K, liquid Pd at 1850 K, and undercooled liquid Pd at 1770 and 1670 K (about 160 K below ${T}_{m}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1827\mathrm{K}$). Data of excellent quality were collected at the European Synchrotron Radiation Facility using an experimental setup combining x-ray absorption spectroscopy, x-ray absorption temperature scans, and x-ray diffraction. The data have been interpreted using an advanced data-analysis method leading to the reliable determination of the radial distribution function $g(r)$ up to $r\ensuremath{\approx}3\AA{}$. The structural differences between undercooled liquid Pd and the liquid in thermodynamic equilibrium are discussed.