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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/1418

Title: (La0.4Ba0.4Ca0.2)(Mn0.4Ti0.6)O3: A new titano-manganate with a high dielectric constant and antiferromagnetic interactions
Authors: Jha, Pika
Rai, Sarita
Ramanujachary, Kandalam V
Lofland, Samuel E
Ganguli, Ashok K
Keywords: Perovskite
Oxides
Magnetic properties
Dielectric properties
Issue Date: 2004
Citation: Journal of Solid State Chemistry, 177(8), 2881-2888
Abstract: A new perovskite-based titano-manganate, (La0.4Ba0.4Ca0.2)(Mn0.4Ti0.6)O3, has been prepared by the ceramic route at 1100°C. This oxide was found to possess the cubic perovskite structure with ‘a’=3.9477(23) Å (space group ). The refined composition as obtained by Rietveld analysis of powder X-ray data was found to be (La0.44Ba0.38Ca0.18)(Mn0.43Ti0.57)O2.91(3) (Rp=0.0704, wRp=0.0828). The composition was also ascertained by Energy dispersive X-ray analysis. Iodometric studies led to a slightly higher oxygen content (compared to Rietveld refinement) corresponding to an average manganese oxidation state of 3.05. The above oxide was found to exhibit high dielectric constant () of 6980 at 1 kHz decreasing to 590 at 100 kHz. At high temperatures (200°C) it shows an unusually high dielectric constant of 20,000 at 1 kHz. In addition to the dielectric properties, detailed magnetic studies show evidence of long-range antiferromagnetic interactions near 5 K. The presence of unusually high dielectric constant coupled with the long-range magnetic interactions may open up interesting applications.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/1418
Appears in Collections:Chemistry

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