• Sangeetha Sampath

      Articles written in Bulletin of Materials Science

    • X-ray powder diffraction study of ZnLi0·5Mn0·5SnO4

      Sangeetha Sampath M P Tare R R Tripathi S M Tare

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      X-ray crystallographic investigation of the title complex oxide composition reveals the presence of two phases. The first is a spinel phase which is somewhat consistent with Zn2SnO4 witha0=8·646 Å. The other phase has been identified as a non-spinel phase of LiMnSnO4, the presence of which was confirmed by synthesizing it and comparing its XRD pattern with that of the title composition. The exact composition of the two phases has been determined by intensity calculations. It seems that while cooperative J-T effect is responsible for the observed symmetry of LiMnSnO4, the distribution of phase along with separation of phases is attributed to the solubility limit of Sn4+ in such quaternary compositions.

    • X-ray crystallographic and conductance study of CuNiSnO4 synthesized by two different methods

      Sangeetha Sampath M P Tare R R Tripathi S M Tare

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      Two new ternary oxidic compositions of CuNiSnO4 have been prepared. The ternary composition Cu2+Ni2+SnO4 in orthorhombic symmetry with lattice dimensionsa0=5·773 ± 0·01 Å;b0=8·377 ± 0·01 Å;c0=10·094 ± 0·01 Å, while Cu+Ni3+SnO4 is also orthorhombic but with lattice dimensionsa0=5·737 ± 0·01 Å;b0=7·125 ± 0·01 Å andc0=10·071 ± 0·01 Å. The variation of electrical conductance with temperature indicates the semiconducting nature of these compositions. Hot-probe method indicatesp-type semiconduction in both the compositions

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