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- W2051234544 abstract "The third member (Hg-1223) of the recently-discovered homologous series HgBa2Can-1CunO2n+2+delta, which having a T(c) of 118 K (assynthesized sample) and 133 K (oxygen-annealed sample), was successfully prepared by solid state reaction and short time annealing technique using the mixtures of metal oxides HgO, BaO, CaO and CuO with starting composition HgBa2Ca2Cu3Oy. We found that the combination of very short annealing time with optimum temperatures 715-725-degrees-C gives rise to a very effective sintering of the constituents and avoids an excessive loss of Hg. This also means that the reaction should be followed by X-ray powder diffraction analysis of the material at each step. Sample so obtained displays a sharp superconducting transition determined both magnetically and resistively. The X-ray diffraction patterns of the 118 K phase and the 133 K phase both indicate a nearly single phase, corresponding to the tetragonal structure of space group of P4/mmm and with lattice parameters a = 0.385 nm and c = 1.585 nm. Energy dispersive X-ray spectroscopic analysis (EDX) data of several flat grains of the Hg-1223 sample shows that the cation stoichiometry is in agreement with the proposed chemical formulae." @default.
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- W2051234544 date "1994-11-01" @default.
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- W2051234544 title "Low-energy phonon softening in the amorphous Fe86Co4Zr10 Invar alloy" @default.
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- W2051234544 doi "https://doi.org/10.1016/0038-1098(94)90447-2" @default.
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