The synthesis and characterization of the HgBa2Ca2Cu3O8+δ and HgBa2Ca3Cu4O10+δ phases

E. V. Antipov, S. M. Loureiro, C. Chaillout, J. J. Capponi, P. Bordet, J. L. Tholence, S. N. Putilin, M. Marezio

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The third (Hg-1223) and the fourth (Hg-1234) members of the recently-discovered homologous series HgBa2Can-1CunO2n+2+δ have been synthesized by solid state reaction, carried out at 950°C under 50 kbar at different annealing times. These phases have a tetragonal cell with lattice parameters: a = 3.8532 (6) A ̊, c = 15.818(2) A ̊, and a = 3.8540(3) A ̊, c = 19.006 (3) A ̊, respectively. The c parameters are in agreement with the formula c {all equal to} 9.5 + 3.2 (n - 1). Electron microscopy study showed similar lattice parameters as well as the occurence of different intergrowths and stacking faults. A periodicity of 22 Å has also been detected, which may be attributed to the existence of the Hg-1245 phase. EDS analysis data of several grains of Hg-1223 and Hg-1234 are in agreement with the proposed chemical formulae. AC susceptibility measurements show that an increase of the superconducting transition temperature with n in the HgBa2Can-1CunO2n+2+δ series occurs till the third member, after which a saturation seems to be achieved.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalPhysica C: Superconductivity and its Applications
Issue number1-2
Publication statusPublished - 20 Sep 1993
Externally publishedYes


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