ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Ba-free Hg,Re-1201 and -1212 were prepared by the sealed quartz tube technique. The starting materials were nominal precursor Re0.20Sr2CanCun−1Ox(n = 1, 2) and HgO. The unreacted pellets were annealed at 750 °C for 12 h for the n = 1 member and 850 °C for 12 h for the n = 2 member. Rietveld structural refinement was performed with the X-ray diffraction patterns, including impurity phases if needed. Both phases showed SG P4/mmm (nr. 123). Fitted tetragonal cell parameters were a = b = 3.7822(1) Å, c = 8.8776(5) Å and a = b = 3.8205(3) Å c = 12.0438(8) Åirc for the n = 1 and n = 2 members, respectively. DCSQUID (Superconducting Quantum Interference Device) magnetometry and AC susceptibility were used to measure the superconducting properties of the samples. We also studied the effect of post-treatments in oxygen and argon. No superconductivity was found for the n = 1 in any case. However, Tc,onset as high as 107 K was determined for the Hg,Re-1212.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1004442132049
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