New double perovskites, LaBaTaNi sub(1-x) Co x O6: Structural, dielectric and magnetic studies

New double perovskites, LaBaTaNi sub(1-x) Co x O6: Structural, dielectric and magnetic studies

Double perovskites of the type LaBaNi sub(1-x) Co x TaO6 (0 plus or minus x plus or minus 1) have been synthesized by solid state method. The compounds crystallize in the tetragonal space group, I4/m. Rietveld refinement has been carried out to determine the phase purity and to study the cation orde...

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Veröffentlicht in:Solid state sciences 2010-08, Vol.12 (8), p.1382-1386
Hauptverfasser: Samal, S L, Magdaleno, T, Ramanujachary, K V, Lofland, SE, Ganguli, A K
Format: Artikel
Sprache:eng
Schlagworte:
Cations
Covalence
Crystallization
Dielectric constant
Dielectrics
Order disorder
Perovskites
Solid state
X-rays
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Zusammenfassung:Double perovskites of the type LaBaNi sub(1-x) Co x TaO6 (0 plus or minus x plus or minus 1) have been synthesized by solid state method. The compounds crystallize in the tetragonal space group, I4/m. Rietveld refinement has been carried out to determine the phase purity and to study the cation ordering. X-ray photoelectron spectroscopy confirms Co(II) in all compositions. The end members in LaBaNi1a degree x Co x TaO6 show high dielectric constant values. Antiferromagnetic ordering has been observed for all the compositions and the ordering temperature in LaBaNi1a degree x Co x TaO6 gradually decreases with increase in Co doping, which has been attributed to the decrease in covalence of Co/Nia degree O bonds. Display Omitted
ISSN:1293-2558
DOI:10.1016/j.solidstatesciences.2010.05.014