Nanoscale Stabilization of New Phases in the PbTe-Sb2Te3 System: PbmSb2nTem+3n Nanocrystals

作者：Soriano Ronald B; Arachchige Indika U; Malliakas Christos D; Wu Jinsong; Kanatzidis Mercouri G^*

来源：Journal of the American Chemical Society, 2013, 135(2): 768-774.

DOI：10.1021/ja309626q

A series of novel rock-salt-type PbmSb2nTem+3n nanocrystals (m = 2, 3, 4, 6, 8, and 10; n = 1 and 2) were successfully prepared using a colloidal synthesis route. These materials are stable only on the nanoscale and have no bulk analogues. Elemental compositions were determined using scanning transmission electron microscopy/energy-dispersive X-ray spectroscopy (STEM/EDS) and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The nanocrystals exhibit well-defined band energies in the mid-IR region that are nearly independent of their atomic compositions. PbmSb2nTem+3n nanocrystals behave as metastable homogeneous solid solutions at room temperature and tend to phase separate into the respective binary PbTe + Sb2Te3 at 300 degrees C. Furthermore, pair distribution PDF) analysis suggests that the local structure of these PbmSb2nTem+3n nanocrystals is distorted with respect to the rock-salt structure.

• 出版日期2013-1-16
• 单位西北大学