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2004 | 105 | 1-2 | 173-182
Article title

Phase and Structural Study of Self-Doped La_{1-x-y}Ca_xØ_yMnO_{3+δ}

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EN
Abstracts
EN
To understand the combined effect of divalent ion and A-site vacancy (Ø) self-doping, beyond the binary La_{1-x}MnO_3 system, polycrystalline La_{1-x-y}Ca_xØ_yMnO_{3+δ} samples were studied. Samples with Ca substitution and excess Mn in the range x<0.33 and y<0.45, respectively, were prepared by standard solid-state reactions. Structural and phase analysis of the samples were done by X-ray diffraction and transmission electron microscopy. The manganite structure in this composition range includes rhombic and orthorhombic phases. Most samples contain the hausmanite phase (Mn_3O_4) coexisting with the manganite phase. A small amount of perovskite related AMn_7O_{12} (A=La,Ca) structure near the hausmanite-manganite boundary is also found in samples treated in oxygen atmosphere. The calculated vacancy content accommodated in the manganite phase can be higher than 1/8, the reported limit for La_{1-x}MnO_3, which is confirmed in our x=0 sample. For the compositions studied, a ferromagnetic metallic behavior below T_C is found, confirming the stability of the Mn sublattice, and near the optimum stoichiometric ((x=0. 33, y=0) system, a net A-site vacancy content (up to y=0.2) does not degrade the magnetic and electric properties.
Keywords
Year
Volume
105
Issue
1-2
Pages
173-182
Physical description
Dates
published
2004-01/02
received
2003-09-15
References
  • 1. A. Maignan, C. Michel, M. Hervieu, B. Raveau, Solid State Commun., 101, 277, 1997
  • 2. T.R. McGuire, A. Gupta, P.R. Duncombe, M. Rupp, J.Z. Sun, R.B. Laibowitz, W.J. Gallagher, Gang Xiao, J. Appl. Phys., 79, 4549, 1996
  • 3. J.A.M. van Roosmalen, P. van Vlaanderen, E.H.P. Cordfunke, W.L. IJdo, D.J.W. IJdo, J. Solid State Chem., 114, 516, 1995
  • 4. J. Töpfer, J.B. Goodenough, Chem. Mater., 9, 1467, 1997
  • 5. G. Dezanneau, A. Sin, H. Roussel, H. Vincent, M. Audier, Solid State Commun., 121, 133, 2002
  • 6. S. Pignard, H. Vincent, J.P. Sénateur, J. Pierre, A. Abrutis, J. Appl. Phys., 82, 4445, 1997
  • 7. P.B. Tavares, V.S. Amaral, J.P. Araújo, J.B. Sousa, A.A.C.S. Lourenço, J.M. Vieira, J. Appl. Phys., 85, 5411, 1999
  • 8. P.A. Joy, C. Raj Sankar, S.K. Date, J. Phys., Condens. Matter, 14, L663, 2002
  • 9. J.P. Araújo, V.S. Amaral, P.B. Tavares, F. Lencart-Silva, A.A.C.S. Lourenço, J.B. Sousa, J.M. Vieira, J. Magn. Magn. Mater., 226-230, 821, 2001
  • 10. F. Figueiras et al., to be published in J. Magn. Magn. Mater
  • 11. A.A. Bosak, O.Yu. Gorbenko, A.R. Kaul, I.E. Graboy, C. Dubourdieu, J.P. Senateur, H.W. Zandbergen, J. Magn. Magn. Mater., 211, 61, 2000
  • 12. B. Bochu, J.L. Buevoz, J. Chenavaz, A. Collomb, J.C. Joubert, M. Marezio, Solid State Commun., 36, 133, 1980
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv105n106kz
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