Title: Preparation of Hg0.8Cr0.2Ba2CuO4+δ under controlled oxygen and mercury partial pressures
Abstract: Abstract Ba 2 CuO 3 /HgBa 2 CuO 4+ δ and Mn 3 O 4 /Mn 2 O 3 couples were employed to control the mercury and oxygen partial pressures, respectively, during the synthesis of chromium doped Hg-1201 phase in the sealed quartz tube. Suitably adjusted conditions allowed us to prepare series of single phase samples of the final composition Hg 0.7 Cr 0.2 Ba 2 CuO 4+ δ determined by weight changes and EMA. The oxygen stoichiometry was modified by the oxygen partial pressure in the range of p O 2 =0.05–1.59 atm. The X-ray diffraction and magnetic susceptibility study revealed linear dependence of the structural parameters and parabolic one of T c vs. log p O 2 . Multiphase samples, however, form for too high oxygen activity, namely for p O 2 =5.16 atm.
Publication Year: 1999
Publication Date: 1999-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 4
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