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New ultrasoft pseudopotentials for the study of silicates. - STFC's ...

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All <strong>of</strong> <strong>the</strong> settings used in creating <strong>the</strong> new USP’s reported here are given in Appendix1. The new USP’s, in a <strong>for</strong>mat suitable <strong>for</strong> CASTEP calculations, may be obtainedby sending email to ukcp@dl.ac.uk..6 AcknowledgmentsThe authors are grateful D. Vanderbilt <strong>for</strong> permission to use his pseudopotential generations<strong>of</strong>tware, details <strong>of</strong> his work on generating Si-USP’s and helpful discussions. Theauthors also thank P.J.D. Lindan, C.J. Pickard, M.C. Payne, D. King-Smith and J.D.Gale <strong>for</strong> suggestions and helpful discussions. All calculations were perfomed on <strong>the</strong>Cray-T3E machine at <strong>the</strong> CSAR service in Manchester and were supported by <strong>the</strong> EP-SRC’s High Per<strong>for</strong>mance Computing Initiative within <strong>the</strong> U.K. Car-Parrinello consortium(GR/N02337).References[1] D. Vanderbilt, Phys. Rev. B 41 (1990) 7892[2] CASTEP 3.9 academic version, licensed under <strong>the</strong> UKCP-MSI agreement, 1999[3] L. Kleinman, D.M. Bylander, Phys. Rev. Lett. 48 (1992) 1425[4] P. J. D. Lindan, The Guide to CASTEP 3.9, Daresbury Laboratory, CLRC, 1999.(see http://www.cse.dl.ac.uk/Activity/UKCP <strong>for</strong> fur<strong>the</strong>r details)[5] G.P. Francis, M.C. Payne, J. Phys. Condens. Matter 17 (1990) 1643[6] V. R. Saunders, R. Dovesi, C. Roetti, M. Causà, N. M. Harrison, R. Orlando andC. M. Zicovich-Wilson, CRYSTAL-98 User’s Manual (Università di Torino, Torino,1999).[7] B. Civalleri, C.M. Zicovich-Wilson, P. Ugliengo, V.R. Saunders, R. Dovesi, Chem.Phys. Lett. 292 (1998) 394.[8] B. Civalleri, S. Casassa, E. Garrone, C. Pisani, P. Ugliengo, J. Phys. Chem. B 103(1999) 2165.[9] P. Ugliengo, B. Civalleri, R. Dovesi, C. M. Zicovich-Wilson, Phys. Chem. Chem.Phys. 1 (1999) 545.[10] P. Ugliengo, B. Civalleri, C. M. Zicovich-Wilson, R. Dovesi, Chem. Phys. Lett. 318(2000) 247.[11] G.A. Lager, J.D. Jorgensen, F.J. Rotella, J. Appl. Phys. 53 (1982) 6751[12] D.C. Allan, M.P. Teter, Phys. Rev. Lett. 59 (1987) 1136; J. Am. Ceram. Soc. 73(1990) 3274[13] J.R. Chelikowsky, H.E. King, Jr., N. Trouiller, J.L. Martins, J. Glinnermann, Phys.Rev. Lett. 65 (1990) 3309[14] F. Liu, S.H. Gar<strong>of</strong>alini, D. King-Smith, D. Vanderbilt, Phys. Rev. B 49 (1994) 125288

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