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Get Full Access to Atkins' Physical Chemistry - 11 Edition - Chapter 15e - Problem P15e.6
Get Full Access to Atkins' Physical Chemistry - 11 Edition - Chapter 15e - Problem P15e.6

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ISBN: 9780198769866 2042

Solution for problem P15E.6 Chapter 15E

Atkins' Physical Chemistry | 11th Edition

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Atkins' Physical Chemistry | 11th Edition

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Problem P15E.6

P.G. Radaelli et al. (Science 265, 380 (1994)) reported the synthesis and structure of a material that becomes superconducting at temperatures below 45 K. The compound is based on a layered compound $$\mathrm{Hg}_{2} \mathrm{Ba}_{2} \mathrm{YCu}_{2} \mathrm{O}_{8-\delta}$$, 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 $$\mathrm{Hg}_{2} \mathrm{Ba}_{2} \mathrm{Y}_{1-x} \mathrm{Ca}_{x} \mathrm{Cu}_{2} \mathrm{O}_{7.55}$$ given that the mass density of the compound is $$7.651 \mathrm{~g} \mathrm{~cm}^{-3}$$.

Text Transcription:

Hg_2 Ba_2 YCu_2 O_8-delta

Hg_2 Ba_2 Y_1-x Ca_x Cu_2 O_7.55

7.651 g cm^-3

Step-by-Step Solution:
Step 1 of 3

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Step 3 of 3

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