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A synchrotron X-ray powder diffraction study of CoAl2O4 and CoGa2O4 by PSD diffractometer technique

Published online by Cambridge University Press:  10 January 2013

A. Nørlund Christensen ,
P. Norby  and
J. C. Hanson
A. Nørlund Christensen*
Affiliation:
Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
P. Norby
Affiliation:
Department of Chemistry, Odense University, DK-5230 Odense M, Denmark
J. C. Hanson
Affiliation:
Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973, U.S.A.
*
a)To whom correspondence should be addressed.
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Abstract

X-ray powder diffraction data for the spinels CoAl2O4 and CoGa2O4 were measured with synchrotron radiation using λ = 1.2033 Å, determined with Si as a standard (a = 5.4305 Å). The two blue compounds prepared hydrothermally are cubic with space group Fd3m. Profile refinements gave the results: CoAl2O4 had a = 8.0968(1) Å and composition (Co0.71Al0.29]Al1.71Co0.29]O4 and CoGa2O4 had a = 8.3229(1) Å and composition Ga[CoGa]O4. The degree of inversion is thus 0.29 for CoAl2O4 and one for CoGa2O4.

Keywords

synchrotron radiationCPS 120 detectoroxide spinelsdegree of inversion
Type
Research Article
Information
Powder Diffraction , Volume 10 , Issue 3 , September 1995 , pp. 185 - 188
Copyright
Copyright © Cambridge University Press 1995

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Footnotes

b)Present address: Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973, U.S.A.

References

Angeletti, C., Pepe, F., and Porta, P. (1977). “Structure and catalytic activity of CoxMg1−xAl2O4 spinel solid solutions. Part 1. Cation distribution of Co2+ ions,” J. Chem. Soc., Faraday Trans. 73, 1972–1982.Google Scholar
Barth, F. W., and Posnjak, E. (1932). “Spinel structures: with and without variate atom equipoints,” Z. Kristallogr. 82, 325–341.Google Scholar
Christensen, A. N., and Rasmussen, S. E. (1963). “Hydrothermal preparation of compounds of the type ABO3 and AB2O4,” Acta Chem. Scand. 17, 845.Google Scholar
Greenwald, S., Pickart, S. J., and Grannis, F. H. (1954). “Cation distribution and g factors of certain spinels containing Ni2+, Mn2+, Co2+, Al3+, Ga3+, and Fe3+,” J. Chem. Phys. 22, 1597–1600.Google Scholar
Leccabue, F., Pelosi, C., Agostinelli, E., Fares, V., Fiorani, D., and Paparazzo, E. (1986). “Crystal growth, thermodynamical and structural study of CoGa2O4 and ZnCr2O4 single crystals,” J. Crystal Growth 79, 410–416.Google Scholar
Otero Arean, C., Garcia Diaz, E., and Mata Arjona, A. (1980). “Synthesis and crystallographic study of mixed spinels: CdxCO1−xAl2O4,” Ann. Quim. Ser. B, 76, 370–372.Google Scholar
Roelofsen, J. N., Peterson, R. C., and Raudsepp, M. (1992). “Structural variation in nickel aluminate spinel (NiAl2O4),” Am. Mineral. 77, 522–528.Google Scholar
Soubeyroux, J. L., Fiorani, D., and Agostinelli, E. (1986). “Spin-glass behavior in cobalt gallium oxyspinel CoGa2O4,” J. Magn. Magn. Mater. 54–57, 83–84.CrossRefGoogle Scholar
Staahl, K., and Hanson, J. (1994). “Real-time X-ray synchrotron powder diffraction studies of the dehydration processes in scolecite and mesolite,” J. Appl. Crystallogr. 27, 543–550.CrossRefGoogle Scholar
Toriumi, K., Ozima, M., Akaogi, M., and Saito, Y. (1978). “Electron-density distribution in crystals of cobalt aluminate (CoAl2O4),” Acta Crystallogr., Sect. B34, 1093–1096.Google Scholar
Wiles, D. B., Sakthivel, A., and Young, R. A. (1988). “Program DBW3.2S for Rietveld Analysis of X-Ray and Neutron Powder Diffraction Patterns,” School of Physics, Georgia Institute of Technology, Atlanta, GA.Google Scholar
Yamaguchi, G., and Miyabe, H. (1975). “Crystal structure of a defective spinel, cobalt(II) oxide. 3 aluminium oxide constituting a cobalt blue pigment,” Yogyo Kyokai Shi 83, 87–89.Google Scholar