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

• Authors: F. Figueiras , J. Araújo , V. Amaral , P. Tavares , A. Lopes , J. Vieira
• Languages of publication: 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

EN

64.75.+g; 81.40.Rs; 75.50.-y; 72.20.My

Discipline

• 75.50.-y: Studies of specific magnetic materials
• 72.20.My: Galvanomagnetic and other magnetotransport effects
• 81.40.Rs: Electrical and magnetic properties related to treatment conditions

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 105
• Issue: 1-2
• Pages: 173-182

Dates

published

2004-01/02

received

2003-09-15

Contributors

author

F. Figueiras

• Departamento de Física and CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal

author

J. Araújo

• Departamento de Física and IFIMUP, Universidade do Porto, 4169-007 Porto, Portugal

author

V. Amaral

• Departamento de Física and CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal

author

P. Tavares

• Departamento de Química and Centro de Química - Vila Real Universidade de Trásos-Montes e Alto Douro, 5001-911 Vila Real, Portugal

author

A. Lopes

• Departamento de Engenharia Cerâmica e do Vidro and CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal

author

J. Vieira

• Departamento de Engenharia Cerâmica e do Vidro and CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal

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

Identifiers

DOI

10.12693/APhysPolA.105.173