Anisotropic diffraction peak broadening and dislocation substructure in hydrogen-cycled LaNi5 and substitutional derivatives. Erratum

Černý, R.; Joubert, J.-M.; Latroche, M.; Percheron-Guégan, A.; Yvon, K.

doi:10.1107/S0021889802001772

addenda and errata

JOURNAL OF
APPLIED
CRYSTALLOGRAPHY

ISSN: 1600-5767

Volume 35| Part 2| April 2002| Page 288

doi:10.1107/S0021889802001772

Anisotropic diffraction peak broadening and dislocation substructure in hydrogen-cycled LaNi₅ and substitutional derivatives. Erratum

R. Černý,^a ^* J.-M. Joubert,^b M. Latroche,^b A. Percheron-Guégan ^b and K. Yvon ^a

^aLaboratoire de Cristallographie, Université de Genève, 24 Quai E. Ansermet, 1211 Genève 4, Switzerland, and ^bLaboratoire de Chimie Métallurgique des Terres Rares, CNRS, 2–8 rue Henri Dunant, 94320 Thiais CEDEX, France
^*Correspondence e-mail: radovan.cerny@cryst.unige.ch

(Received 24 January 2002; accepted 28 January 2002)

An erroneous equation and some consequently underestimated values of dislocation densities in the paper by Černý et al. [J. Appl. Cryst. (2000), 33, 997–1005 ] are corrected.

In the paper by Černý et al. (2000), equation (4) on page 998 was erroneously interpreted and used in the calculations. The correct equation is

$[A = [1 - \ln (\ln P)/(4 \ln P)]^{-1 }.]$

The only consequence of this error is that some values of the dislocation densities as given in Table 2 and Fig. 3 of that paper are slightly underestimated. Correct values of the dislocation densities for all studied compounds are given in Table 1 herein. The value for LaNi₅ is, however, still lower by one order of magnitude than the value determined for the same compound by Wu et al. (1998).

Table 1
Corrected dislocation densities

Compound	ρ (10¹¹ cm⁻²)
LaNi₅	3.8 (4)
LaNi_4.25Co_0.75	3.9 (3)
LaNi₃Co₂	0.52 (4)
LaNi_4.6Mn_0.4	2.7 (3), P = 3
LaNi₄Mn	3.8 (3), P = 3
LaNi_4.9Al_0.1	1.6 (1)
LaNi_4.7Al_0.3	0.29 (5), P = 3
LaNi_3.85Co_0.75Mn_0.4	0.62 (9), P = 3
LaNi_3.95Co_0.75Al_0.3	0.045 (7), P = 3
LaNi_4.3Mn_0.4Al_0.3	1.1 (1), P = 3
LaNi_3.94Co_0.36Mn_0.4Al_0.3	1.7 (3), P = 3
LaNi_3.55Co_0.75Mn_0.4Al_0.3	0.17 (1), P = 3
LaNi₄Fe	1.7 (1)
LaNi₄Cu	0.35 (4), P = 3
LaNi_4.5Sn_0.5	0.06 (1), P = 3
La_0.5Ce_0.5Ni₅	5.1 (6)
LaNi_5.2	3.0 (1)

References

Černý, R., Joubert, J.-M., Latroche, M., Percheron-Guégan, A. & Yvon, K. (2000). J. Appl. Cryst. 33, 997–1005. Web of Science CrossRef IUCr Journals Google Scholar
Wu, E., Kisi, E. H. & Gray, E. MacA. (1998). J. Appl. Cryst. 31, 363–368. Web of Science CrossRef CAS IUCr Journals Google Scholar

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