Dense SixGe1-x (0 <x <1) Materials Landscape Using Extreme Conditions and Precession Electron Diffraction

George Serghiou*, Gang Ji, Monika Koch-Mueller, Nicholas Odling, Hans J. Reichmann, Jonathan P. Wright, Paul Johnson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

High-pressure and -temperature experiments on Ge and Si mixtures to 17 GPa and 1500 K allow us to obtain extended Ge Si solid solutions with cubic (Ia (3) over bar) and tetragonal (P4(3)2(1)2) crystal symmetries at ambient pressure. The cubic modification can be obtained with up to 77 atom % Ge and the tetragonal modification for Ge concentrations above that. Together with Hume-Rothery criteria, melting point convergence is employed here as a favored attribute for solid solution formation. These compositionally tunable alloys are of growing interest for advanced transport and optoelectronic applications. Furthermore, the work illustrates the significance of employing precession electron diffraction for mapping new materials landscapes resulting from tailored high-pressure and -temperature syntheses.

Original languageEnglish
Pages (from-to)5656-5662
Number of pages7
JournalInorganic Chemistry
Volume53
Issue number11
Early online date14 May 2014
DOIs
Publication statusPublished - 2 Jun 2014

Keywords

  • PHASE GERMANIUM NANOCRYSTALS
  • HIGH-PRESSURE PHASES
  • SOLID-SOLUTIONS
  • IMMA PHASE
  • STRUCTURAL-PROPERTIES
  • CRYSTALLINE SILICON
  • SYSTEMATIC METHOD
  • RAY-DIFFRACTION
  • SPACE GROUP
  • AB-INITIO
  • group theory
  • Crystal structure
  • carbon
  • physical and chemical process
  • Phase transitions

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