We present an algorithm for generating all derivative superstructures of a nonprimitive parent lattice. The algorithm has immediate application in important materials design problems such as modeling hexagonal-close-packed (hcp) alloys. Extending the work of Hart and Forcade [Phys. Rev. B 77, 224115 (2008)] (which applies only to Bravais lattices), this approach applies to arbitrary multilattices. The algorithm enumerates superlattices and atomic configurations using permutation groups rather than direct geometric comparisons. The key concept is to use the quotient group associated with each superlattice to determine all unique atomic configurations. The algorithm is very efficient; the run time scales linearly with the number of unique structures found. We demonstrate the algorithm in the important case of hcp-derived superstructures. In the list of enumerated hexagonal-close-packed derivative superstructures, we predict several as-yet-unobserved structures as likely candidates for new intermetallic prototypes.
Original Publication Citation
Gus L. W. Hart and Rodney W. Forcade, "Generating derivative structures from multilattices: Application to hcp alloys," Phys. Rev. B8 1412 (July 29). The original article may be found here: http://prb.aps.org/abstract/PRB/v8/i1/e1412
BYU ScholarsArchive Citation
Hart, Gus L. W. and Forcade, Rodney W., "Generating derivative structures from multilattices: Algorithm and application to hcp alloys" (2009). All Faculty Publications. 127.
The American Physical Society
Physical and Mathematical Sciences
Physics and Astronomy
© 2009 The American Physical Society
Copyright Use Information