Lattice Constants of Solid Solution Microstructures: The Case of Nanocrystalline Pd-H

Jörg Weissmüller; Christian Lemier

doi:10.1103/PhysRevLett.82.213

Lattice Constants of Solid Solution Microstructures: The Case of Nanocrystalline Pd-H

Jörg Weissmüller and Christian Lemier

Phys. Rev. Lett. 82, 213 – Published 4 January 1999

Abstract

We present an analysis of the effect of interface stress on strain in bulk in an open system with a large interface-to-volume ratio, at equilibrium with the solute at a controlled chemical potential. The results are relations for interface stress and for solute concentration in the bulk as a function of measurable parameters: interfacial “stretch” and changes in the lattice constant. Stretch models a change in the average normal component of the interatomic spacing at interfaces. X-ray diffraction and dilatometry provide experimental data showing a significant variation of grain boundary stress and stretch in nanocrystalline Pd-H with hydrogen chemical potential.

Received 15 June 1998

DOI:https://doi.org/10.1103/PhysRevLett.82.213

Authors & Affiliations

Jörg Weissmüller^* and Christian Lemier

Fachrichtung Technische Physik, Universität des Saarlandes, Saarbrücken, Germany

^*Author to whom correspondence should be addressed. FB 10 Physik, Gebäude 43B, Universität des Saarlandes, P.O. Box 151150, D-66041 Saarbrücken, Germany. Phone: +49 681 302 5199. Fax: +49 681 302 5222. Email address: weissm@rz.uni-sb.de