P.G. Radaelli, M. Maurizio, M. Perroux, S. de Brion, J, L. Tholence, Q. Huang, and A. Santoro
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P.G. Radaelli, M. Maurizio, M. Perroux, S. de Brion, J, L. Tholence, Q. Huang, and A. Santoro (Science 265,380 (994)) report the synthesis and structure of a material that becomes superconducting at temperatures below 45 K. The compound is based on a layered compound Hg2 Ba2 YCu2 Oso which has a tetragonal unit cell with a = 0.38606 nm and c= 2.8915 nm; each unit cell contains two formula units. The compound is made superconducting by partially replacing Y by Ca, accompanied by a change in unit cell volume by less than 1 per cent. Estimate the Ca content x in superconducting Hg2 Ba2 YI-x Ca2Cu207.55 given that the mass density of the compound is 7.651 g cm-3
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