Crystal structure of nonstoichiometric copper-substituted La(Ni[sub 1[minus]z]Cu[sub z])[sub x] compounds studied by neutron and synchrotron anomalous powder diffraction
- CNRS, Thiais (France). Lab. de Chimie Metallurgique des Terres Rares
- Philips Research Labs., Eindhoven (Netherlands)
The structural properties of the potential battery electrode materials LaNi[sub 4]Cu, LaNi[sub 4.4]Cu, LaNi[sub 5]Cu, and LaNi[sub 4.5]Cu[sub 1.5] have been investigated by neutron and anomalous synchrotron powder diffraction. The nonstoichiometry of such AB[sub x] (5 [le] x [le] 6) compounds has been described in a structure derived from the hexagonal CaCu[sub 5]-type structure by replacement of the A atoms by dumbbells of B atoms. In these copper-substituted compounds, Cu can occupy any of the four available nickel sites. From a joint refinement procedure using both neutron and synchrotron data, the copper-to-nickel ratio at each B site has been determined. This shows that substitution is not random and that copper occupies some crystallographic sites preferentially. The results are discussed and compared to other substituted AB[sub 5] systems.
- OSTI ID:
- 6117064
- Journal Information:
- Journal of Solid State Chemistry, Vol. 146:2; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
Similar Records
The influence of Mn on the crystallography and electrochemistry of nonstoichiometric AB{sub 5}-type hydride-forming compounds
Investigation of modification of hydrogenation and structural properties of LaNi{sub 5} intermetallic compound induced by substitution of Ni by Pd
Related Subjects
25 ENERGY STORAGE
COPPER ALLOYS
CRYSTAL STRUCTURE
ELECTRIC BATTERIES
EXPERIMENTAL DATA
LANTHANUM ALLOYS
NEUTRON DIFFRACTION
NICKEL ALLOYS
STOICHIOMETRY
X-RAY DIFFRACTION
ALLOYS
COHERENT SCATTERING
DATA
DIFFRACTION
ELECTROCHEMICAL CELLS
INFORMATION
NUMERICAL DATA
RARE EARTH ALLOYS
SCATTERING
360102* - Metals & Alloys- Structure & Phase Studies
250903 - Energy Storage- Batteries- Materials
Components
& Auxiliaries