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Role of annealing conditions on the ferromagnetic and dielectric properties of La2NiMnO6

Published online by Cambridge University Press:  28 February 2011

Farheen N. Sayed ,
S.N. Achary ,
O.D. Jayakumar ,
S.K. Deshpande ,
P.S.R. Krishna ,
S. Chatterjee ,
P. Ayyub  and
A.K. Tyagi
Farheen N. Sayed
Affiliation:
Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
S.N. Achary*
Affiliation:
Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
O.D. Jayakumar
Affiliation:
Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
S.K. Deshpande
Affiliation:
UGC-DAE Consortium for Scientific Research, Bhabha Atomic Research Centre, Mumbai 400085, India
P.S.R. Krishna
Affiliation:
Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
S. Chatterjee
Affiliation:
Department of Condensed Matter Physics, Tata Institute of Fundamental Research, Mumbai 400005, India
P. Ayyub
Affiliation:
Department of Condensed Matter Physics, Tata Institute of Fundamental Research, Mumbai 400005, India
A.K. Tyagi*
Affiliation:
Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
*
a)Address all correspondence to these authors. e-mail: sachary@barc.gov.in
b)e-mail: aktyagi@barc.gov.in
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Abstract

La2NiMnO6 (LNMO) was prepared by a combustion method followed by heating at high temperature. Subsequently, the preformed LNMO was annealed in air, oxygen, or N2 atmosphere and characterized by powder x-ray diffraction (XRD), neutron diffraction, superconducting quantum interference device magnetometry, and dielectric analysis. Structural studies by XRD and neutron diffraction revealed the coexistence of partially cation disordered monoclinic (31%) and rhombohedral (69%) phases in the sample annealed in air. However, the sample annealed in oxygen shows about 50:50% of monoclinic and rhombohedral phases. Relaxor-like behavior with relative permittivity of the order of 104 was observed in the sample annealed in air, while relative permittivity decreases to about 200 in samples annealed in oxygen atmosphere. The magnetic properties indicate a well-defined ferromagnetic phase in the oxygen-annealed sample compared to a feeble ferromagnetic signature in the air-annealed one. The dielectric and ferromagnetism of LNMO samples have been related to formation and annihilation of oxygen vacancies.

Keywords

Crystallographic StructureFerromagneticDielectric Properties
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 4 , 28 February 2011 , pp. 567 - 577
Copyright
Copyright © Materials Research Society 2011

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