Hydrogen-Induced Defects in Palladium

• Authors: O. Melikhova , J. Čížek , I. Procházka
• Languages of publication: EN

Abstracts

EN

In the present work positron annihilation spectroscopy was employed for investigation of hydrogen-induced defects in Pd. Well annealed Pd samples were electrochemically charged with hydrogen and development of defects with increasing hydrogen concentration x_{H} was investigated. At low concentrations (α-phase, x_{H} < 0.017 H/Pd) hydrogen loading introduced vacancies, since absorbed hydrogen segregating at vacancies lowers remarkably the vacancy formation energy. When hydrogen concentration exceeds 0.017 H/Pd, particles of palladium hydride (PdH) are formed. Stress induced by growing PdH particles leads to plastic deformation which generates dislocations and vacancies in the sample.

Keywords

EN

78.70.Bj; 61.72.-y

Discipline

• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 61.72.-y: Defects and impurities in crystals; microstructure(for radiation induced defects, see 61.80.-x; for defects in surfaces, interfaces, and thin films, see 68.35.Dv and 68.55.Ln; see also 85.40.Ry Impurity doping, diffusion, and ion implantation technology; for effects of crystal defects and doping on superconducting transition temperature, see 74.62.Dh)

• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 125
• Issue: 3
• Pages: 752-755

Dates

published

2014-03

Contributors

author

O. Melikhova

• Faculty of Mathematics and Physics, Charles University in Prague V Holešovičkách 2, Praha 8, CZ-180 00, Czech Republic

author

J. Čížek

• Faculty of Mathematics and Physics, Charles University in Prague V Holešovičkách 2, Praha 8, CZ-180 00, Czech Republic

author

I. Procházka

• Faculty of Mathematics and Physics, Charles University in Prague V Holešovičkách 2, Praha 8, CZ-180 00, Czech Republic

References

• [1] T.B. Flanagan, W.A. Oates, Annu. Rev. Mater. Sci. 21, 269 (1991), doi:10.1146/annurev.ms.21.080191.001413
• [2] A. Pundt, R. Kirchheim, Annu. Rev. Mater. Res. 36, 555 (2006), doi:10.1146/annurev.matsci.36.090804.094451
• [3] R. Kirchheim, Prog. Mater. Sci. 32, 261 (1988), doi:10.1016/0079-6425(88)90010-2
• [4] T. Mütschele, R. Kirchheim, Scr. Metall. 21, 135 (1987), doi:10.1016/0036-9748(87)90423-6
• [5] F. Besenbacher, J.K. Norskow, M.J. Puska, S. Holloway, Nucl. Instrum. Methods Phys. Res. B 7-8, 55 (1985), doi:10.1016/0168-583X(85)90529-4
• [6] Y. Fukai, N. Ōkuma, Phys. Rev. Lett. 73, 1640 (1994), doi:10.1103/PhysRevLett.73.1640
• [7] R. Kirchheim, Acta Mater. 55, 5129 (2007), doi:10.1016/j.actamat.2007.05.047
• [8] R. Kirchheim, Int. J. Mater. Res. 100, 483 (2009), doi:10.3139/146.110065
• [9] P. Hautojärvi, in: Positrons in Solids, Ed. P. Hautojärvi, Springer-Verlag, Berlin 1979, p. 1
• [10] J. Čížek, I. Procházka, F. Bečvář, R. Kužel, M. Cieslar, G. Brauer, W. Anwand, R. Kirchheim, A. Pundt, Phys. Rev. B 69, 224106 (2004), doi:10.1103/PhysRevB.69.224106
• [11] F. Bečvář, J. Čížek, I. Procházka, J. Janotová, Nucl. Instrum. Methods Phys. Res. A 539, 372 (2005), doi:10.1016/j.nima.2004.09.031
• [12] I. Procházka, I. Novotný, F. Bečvář, Mater. Sci. Forum 255-257, 772 (1997), doi:10.4028/www.scientific.net/MSF.255-257.772
• [13] J.M. Campillo Robles, E. Ogando, F. Plazaola, J. Phys., Condens. Matter 19, 176222 (2007), doi:10.1088/0953-8984/19/17/176222
• [14] E. Boroński, R.M. Nieminen, Phys. Rev. B 34, 3820 (1986), doi:10.1103/PhysRevB.34.3820
• [15] B. Barbiellini, M.J. Puska, T. Korhonen, A. Harju, T. Torsti, R.M. Nieminen, Phys. Rev. B 53, 16201 (1996), doi:10.1103/PhysRevB.53.16201
• [16] J. Čížek, I. Procházka, S. Daniš, G. Brauer, W. Anwand, R. Gemma, E. Nikitin, R. Kirchheim, A. Pundt, R.K. Islamgaliev, Phys. Rev. B 79, 054108 (2009), doi:10.1103/PhysRevB.79.054108
• [17] C. Borchers, U. Laudahn, A. Pundt, S. Fähler, H.U. Krebs, R. Kirchheim, Philos. Mag. A 80, 543 (2000), doi:10.1080/01418610008212067
• [18] R. West, in: Ref. [9], p. 89
• [19] P. Hautojärvi, C. Corbel, in: Proc. Int. School of Physics 'Enrico Fermi', Course CXXV, Eds. A. Dupasquier, A.P. Mills, IOS Press, Varena 1995, p. 491
• [20] H.J. Wollenberger, in: Physical Metallurgy, Vol. 2, Eds. R.W. Cahn, P. Haasen, North-Holland, Amsterdam 1983, p. 1146
• [21] M. Doyama, J.S. Koehler, Acta Metall. 24, 871 (1976), doi:10.1016/0001-6160(76)90055-9

Identifiers

DOI

10.12693/APhysPolA.125.752