Nanoscale stabilization of new phases in the PbTe-Sb2Te 3 System: PbmSb2 nTem +3 n nanocrystals

Ronald B. Soriano, Indika U. Arachchige, Christos D. Malliakas, Jinsong Wu, Mercouri G. Kanatzidis

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

A series of novel rock-salt-type PbmSb2nTe m+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 C. Furthermore, pair distribution function (PDF) analysis suggests that the local structure of these PbmSb2nTem+3n nanocrystals is distorted with respect to the rock-salt structure.

Original languageEnglish
Pages (from-to)768-774
Number of pages7
JournalJournal of the American Chemical Society
Volume135
Issue number2
DOIs
Publication statusPublished - Jan 16 2013

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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