New double perovskites, LaBaTaNi1-xCoxO6: Structural, dielectric and magnetic studies

作者：Samal S L; Magdaleno T; Ramanujachary K V; Lofland S E; Ganguli A K^*

来源：Solid State Sciences, 2010, 12(8): 1382-1386.

DOI：10.1016/j.solidstatesciences.2010.05.014

• Perovskites
• Rietveld refinement
• Dielectric properties

Double perovskites of the type LaBaNi1-xCoxTaO6 (0 <= x <= 1) have been synthesized by solid state method. The compounds crystallize in the tetragonal space group, 14/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 LaBaNi1-xCoxTaO6 show high dielectric constant values. Antiferromagnetic ordering has been observed for all the compositions and the ordering temperature in LaBaNi1-xCoxTaO6 gradually decreases with increase in Co doping, which has been attributed to the decrease in covalence of Co/Ni-O bonds.

• 出版日期2010-8