(La2/5Ba2/5Ca1/5)(Mn(2/5)-x Ni x Ti3/5)O3: Rietveld studies, dielectric and magnetic properties of new perovskite-related oxides |
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| Authors: | Pika Jha Saroj L. Samal Kandalam V. Ramanujachary Samuel E. Lofland Ashok K. Ganguli |
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| Affiliation: | (1) Department of Chemistry, Indian Institute of Technology, Hauz Khas, 110 016 New Delhi, India;(2) Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, 08028 Glassboro, NJ, USA;(3) Department of Physics and Astronomy, Rowan University, 201 Mullica Hill Road, 08028 Glassboro, NJ, USA |
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| Abstract: | Oxides of the type (La2/5Ba2/5Ca1/5)(Mn(2/5)-x Ni x Ti3/5)O3 (0 ≤ x ≤ 0.4) have been synthesized by the ceramic route. All the above oxides have been found to crystallize in the cubic perovskite structure. Rietveld refinement of the Ni-based oxide, (La2/5Ba2/5Ca1/5)(Ni2/5Ti3/5)O3 gave rise to a composition (La0.44Ba0.38Ca0.18) (Ni0.42Ti0.58)O2.85(6) and the refined lattice parameter obtained was 3.9411(2) Å (space group Pm3m;R(F2) = 0.026,R p = 0.074,wR p = 0.087). A shift from antiferromagnetic to paramagnetic behaviour is observed with increase in nickel concentration, the Mn-rich phases showing antiferromagnetism around 5 K. There is a systematic decrease in the dielectric constant, ε and loss tangent with increase in Ni concentration (from ε = 592 forx = 0 to ε = 78 forx = 0.4). |
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| Keywords: | Oxides Rietveld studies dielectric |
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