• Indu Bhushan Sharma

      Articles written in Bulletin of Materials Science

    • Solid state chemistry of Ruddlesden-Popper type complex oxides

      Indu Bhushan Sharma Devinder Singh

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      Various criteria of formation of perovskites and K2NiF4-type compounds, which are the end members of homologous Ruddlesden-Popper series of phases, have been discussed. RP-phases show some general trends in their physical properties. Literature survey of the formation of these phases, their properties, and effect of oxygen stoichiometry and doping is presented. Some conditions for their synthesis are also described.

    • Structure and electric transport properties of LnSr2FeTiO7 (Ln = La, Nd and Gd)

      Suresh Gupta V Singh B L Sharma Indu Bhushan Sharma

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      Three new phases with compositions, LaSr2FeTiO7, NdSr2FeTiO7 and GdSr2FeTiO7, were prepared by the traditional ceramic method. Lazy–Pulverix analysis of the X-ray diffraction data suggests that the phases crystallize in the RP-type (𝑛 = 2) structure in the space group, 𝐼4/𝑚𝑚𝑚. The cell dimensions along the 𝑐-axis decrease with decrease in size of the rare earth ions. Electrical resistivity, as a function of temperature, shows that the materials are insulators and the resistivity decreases with decrease in the size of the rare earth ion, which is attributed to increase in the three-dimensional character.

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