Structure and Bonding in Cubic IV-VI Crystals VII. On the Influence of Defects on the Stability of the Cubic Structure

✍ Scribed by P. Enders

• Publisher: John Wiley and Sons
• Year: 1985
• Tongue: English
• Weight: 362 KB
• Volume: 130
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.2221300214

✦ Synopsis

Abstract

The influence of defects (vacancies) on the phase transition is qualitatively treated within the framework of simple one‐dimensional models. Generalizing Gömez‐Santos' and Ynduráin's treatment to a diatomic chain, their stabilizing the cubic phase rôle can be explained as destroying the coherence of the electronic charge density wave driving the Peierls instability. The degree of coherence destroying necessary to suppress the phase transition can be quite small due to the extrinsic Peierls gap (ionic energy).