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      https://www.ias.ac.in/article/fulltext/boms/028/06/0571-0577

    • Keywords

       

      Oxides; Rietveld studies; dielectric.

    • Abstract

       

      Oxides of the type (La2/5Ba2/5Ca1/5)(Mn(2/5)–𝑥Ni𝑥Ti3/5)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 𝑃𝑚$\bar{3}$𝑚; 𝑅(𝐹2) = 0.026, 𝑅p = 0.074, 𝑤𝑅p = 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 for 𝑥 = 0 to 𝜀 = 78 for 𝑥 = 0.4).

    • Author Affiliations

       

      Pika Jha1 Saroj L Samal1 Kandalam V Ramanujachary2 Samuel E Lofland3 Ashok K Ganguli1

      1. Department of Chemistry, Indian Institute of Technology, Hauz Khas, New Delhi 110 016, India
      2. Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, USA
      3. Department of Physics and Astronomy, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, USA
    • Dates

       
  • Bulletin of Materials Science | News

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