Ti-doped LiMn2O4; crystal structure; magnetic properties; impedance spectroscopy; charge-discharge test
Abstract :
[en] LiMn2-xTixO4 compounds with 0.5 =<x =< 1 were prepared by solid state reaction and Pechini technique. Powder X-ray diffraction showed that all samples crystallize with the spinel crystal structure (S.G. Fd3m). The cubic unit-cell parameter increases with the Ti content. The influence of the Ti content and cationic distribution on the magnetic properties of the compounds was studied by measuring the temperature and magnetic field dependences of the magnetization: substitution by non-magnetic d(0) Ti4+ ions appeared to weaken the magnetic interactions between the manganese ions. The electrical properties of LiMnTiO4 were studied by AC impedance spectroscopy and DC polarisation measurements, which revealed the electronic character of the conduction process. (c) 2006 Elsevier B.V. All rights reserved.
Research center :
SUPRATECS - Services Universitaires pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - ULiège
Ammundsen B., and Rozière J. J. Phys. Chem., B 101 (1997) 8156
Liu W., Farrington G.C., Chaput F., and Dunn B. J. Electrochem. Soc. 143 (1996) 879
Julien C., Mangani I., Selladurai S., and Massot M. Solid State Sci. 4 (2002) 1031
Lee B. J. Power Sources 109 (2002) 220
Sun Y., and Jin S. J. Mater. Chem. 8 (1998) 2399
Hwang B., Santhanam R., Liu D., and Tsai Y. J. Power Sources 102 (2001) 326
Yoo K.S., Cho N.W., and Oh Y. Solid State Ionics 113-115 (1998) 43
Bellitto C., Bauer E., Righini G., Green M., Branford W., Antonini A., and Pasquali M. J. Phys. Chem. Solids 65 (2004) 29
Ammundsen B., Islam M.S., Jones D.J., and Rozière J.-M. J. Power Sources 81-82 (1999) 500
Suzuki S., Tomita M., Okada S., and Arai H. J. Phys. Chem. Solids 57 (1996) 1851
Arillo M.A., Lopez M.L., Pico C., Veiga M.L., Jimenez-Lopez A., and Rodriguez-Castellon E. J. Alloys Compd. 317-318 (2001) 160
Arillo M.A., Cuello G., Lopez M.L., Martin P., Pico C., and Veiga M.L. Solid State Sci. 7 (2005) 25
Petrov K., Rojas R.M., Alonso P.J., Amarilla J.M., Lazarraga M.G., and Rojo J.M. Solid State Sci. 7 (2005) 277
Young R.A., Saktivel A., Moss T.S., and Paiva-Santos C.O. J. Appl. Crystallogr. 28 (1995) 366
Shannon R.D. Acta Crystallogr., A A32 (1976) 751
Mac Donald J.R. Impedance Spectroscopy : Emphasizing Solid Materials and Systems (1987), Wiley, New-York
Martin P., Lopez M.L., Veiga M., and Pico C. Solid State Sci. 6 (2004) 325
Brown J.D., and Altermatt D. Acta Crystallogr. B41 (1985) 244
Young R.A., Larson A.C., and Paiva-Santos C.O. User's Guide to Program DBWS-9807 for Rietveld Analysis of X-ray and Neutron Powder Diffraction Patterns (1998), Schools of Physics, Georgia Institute of Technology, Atlanta, USA