Abstract:For the first time in hydrochemical conditions tetrathioarsenates of d10-metals by composition Ag 3 AsS 4 and M 3 (AsS 4 ) 2 ·H 2 O, where M-Zn, Cd or Hg and X=(Zn) or 2(Cd, Hg), were synthesized. Their composition, constitution, reaction of dehydration and thermal shock resistance in 20-1000 interval were studied by means of thermal analysis, UR-spectroscopy, X-ray crystal determination and derivatographic research.

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Synthesized substances obtained by sodium tetrathioarsenate reaction with silver(I), cobalt (II), mickelous (II), copper (II), zincous, cadmium and mercury have been studied by IR-spectroscopy, X-ray analysis.

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This paper presents sol-gel (SG) and solid-state reaction (SSR) pathways to produce multiphase ceramic precursors of BCCO and then the superconducting phase of Tl-1223. The heat treatments showed that to obtain high-purity precursors prepared by SG and SSR methods are sufficient to heat treatments at 915 and 945 °C, respectively. Furthermore, the diamagnetic onset temperature of the superconducting transition for the Tl-1223 samples prepared by precursors SG at 915 °C and SSR at 945 °C is approximately 120 K, and complete screening of applied ac magnetic fields observed at T ≈ 102 and ≈ 94 K, respectively. In addition, the value of the transport critical current density Jc for SSR was 128 A/cm2, whereas for the SG sample it was precisely 174 A/cm2. Thus, we could conclude that using wet chemistry offers some advantages over classical solid-state ceramic processing, significantly better chemical homogeneity, and higher reactivity of the precursor powder.