• Sebastian C Peter

      Articles written in Journal of Chemical Sciences

    • Single crystal growth of europium and ytterbium based intermetallic compounds using metal flux technique

      Sumanta Sarkar Sebastian C Peter

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      This article covers the use of indium as a potential metal solvent for the crystal growth of europium and ytterbium-based intermetallic compounds. A brief view about the advantage of metal flux technique and the use of indium as reactive and non-reactive flux are outlined. Large single crystals of EuGe2, EuCoGe3 and Yb2AuGe3 compounds were obtained in high yield from the reactions of the elements in liquid indium. The results presented here demonstrate that considerable advances in the discovery of single crystal growth of complex phases are achievable utilizing molten metals as solvents.

    • Structure and properties of SmCu$_{6−x}$In$_{6+x}$ (𝑥 = 0, 1, 2)

      Udumula Subbarao Sebastian C Peter

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      High quality single crystals of SmCu6In6 were obtained from the reactions run in excess liquid indium and characterized by means of single crystal X-ray diffraction data. SmCu6In6 crystallizes in the YCu6In6 structure type, tetragonal space group $I4/mmm$ and lattice constants are 𝑎 = 𝑏 = 9.2036$(3) Å and 𝑐 = 5.4232(3) Å. SmCu$_{6−x}$In$_{6+x}$ (𝑥 = 0, 1, 2) compounds were obtained using arc melting and characterized using powder X-ray diffraction. Magnetic susceptibility data follow modified Curie-Weiss law behaviour above 50K and the experimentally measured magnetic moment values in SmCu4In8, SmCu5In7 and SmCu6In6 are 0.83 $\mu_B$, 1.45 $\mu_B$ and 0.90 $\mu_B$ per Sm atom, respectively. SmCu5In7 and SmCu6In6 compounds show antiferromagnetic ordering at $T_N = 7.8$ K, and no magnetic ordering was observed for SmCu4In8 down to 2 K. Electrical resistivity measurements show that all compounds are of metallic nature.

    • Crystal growth, structure and magnetic properties of Sm3Ni5Al19: A compound in the Sm$_{2n+m}$Ni$_{4n+m}$Al$_{15n+4m}$ homologous series

      Udumula Subbarao Aloke Kumar Ghosh Sumanta Sarkar Sebastian C Peter

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      Sm3Ni5Al19 was obtained as large rod shaped single crystals from reactive aluminium flux. Single crystal X-ray diffraction suggests that Sm3Ni5Al19 crystallizes in the Gd3Ni5Al19 structure type, orthorhombic space group $Cmcm$ and lattice constants 𝑎 = 4.0974(1) Å, 𝑏 = 16.0172(6)Å and 𝑐 = 27.0774(10) Å. Sm3Ni5Al19 is a member of the Sm$_{2n+m}$Ni$_{4n+m}$Al$_{15n+4m}$ series with n = 1 and m = 1. The crystal structure of Sm3Ni5Al19 consists of SmNiAl4 and Sm2Al4Al15 slabs intergrown along the 𝑏-axis. Magnetic susceptibility data on Sm3Ni5Al19 confirms the paramagnetic nature with a complicated magnetic ordering below 18 K. The inverse susceptibility data follows modified Curie-Weiss law above 150 K with effective magnetic moment 1.3 $\mu_{\text{B}}$/Sm atoms suggests trivalent Sm atoms.

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