Mechanically Controlled, Seeded Formation of a Nanoscale Metastable Phase in Ionic Compounds

• Published in: Nano letters Vol. 4; no. 9; pp. 1769 - 1773
• Main Authors: Palko, James W, Durandurdu, Murat, Kieffer, John
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 01.09.2004
• Subjects: Condensed matter: structure, mechanical and thermal properties; Defects and impurities in crystals; microstructure; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; General studies of phase transitions; Grain and twin boundaries; Nucleation; Physics; Structure of solids and liquids; crystallography; Grain boundaries; Cubic lattices; Gibbs free energy; Patterning; Inorganic compounds; Nucleation; Phase transformations; Ionic compound; Metastable states; Digital simulation; Binary compounds; Nanostructures; Experimental study; Stress-strain relations; Seeding; Sodium chlorides; Interfaces; Hexagonal lattices; Stress effects; Lithium chlorides
• ISSN: 1530-6984; 1530-6992
• DOI: 10.1021/nl0491879

Like in epitaxial and hetero-epitaxial growth, the structural order at internal grain boundaries may be used to control the nature of new phases that nucleate at such an interface. We demonstrate this concept via computer simulation. We predict the templated nucleation of a new metastable phase at the (310) symmetric tilt grain boundary in both NaCl and LiCl when subject to an external mechanical constraint. The level of applied stress allows one to control the extent to which this metastable phase grows with nanoscale precision. This interfacial seeding of structural transitions has potential to produce functionally patterned materials for novel logic and sensing devices.