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Microstructural analysis of nickel hydroxide: Anisotropic size versus stacking faults

Published online by Cambridge University Press:  01 March 2012

Montse Casas-Cabanas ,
Maria Rosa Palacín  and
Juan Rodríguez-Carvajal
Montse Casas-Cabanas
Affiliation:
Institut de Ciència de Materials de Barcelona (CSIC), Campus UAB, 08193 Bellaterra, Spain
Maria Rosa Palacín
Affiliation:
Institut de Ciència de Materials de Barcelona (CSIC), Campus UAB, 08193 Bellaterra, Spain
Juan Rodríguez-Carvajal*
Affiliation:
Laboratoire Léon Brillouin (CEA-CNRS), CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France
*
a)Electronic mail: [email protected]
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Abstract

Two different approaches for studying sample’s contributions to diffraction-line broadening are analyzed by applying them to several nickel hydroxide samples. Both are based in the refinement of powder diffraction data but differ in the microstructural model used. The first one consists in the refinement of the powder diffraction pattern using the FAULTS program, a modification of DIFFaX, which assigns peak broadening mainly to the presence of stacking faults and treats finite size effects by convolution with a Voigt function. The second method makes use of the program FULLPROF, which allows the use of linear combinations of spherical harmonics to model peak broadening coming from anisotropic size effects. The complementary use of transmission electron microscopy has allowed us to evaluate the best approach for the Ni(OH)2 case. In addition, peak shifts, corresponding to reflections 10l (l≠0) were observed in defective nickel hydroxide samples that can be directly correlated with the degree of faulting.

Keywords

microstructurenickel hydroxideline broadeningcrystallite sizestacking faults
Type
Invited Articles
Information
Powder Diffraction , Volume 20 , Issue 4 , December 2005 , pp. 334 - 344
Copyright
Copyright © Cambridge University Press 2005

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