High pressure crystal growth of Y2Ba4Cu6+nO14+n and HgBa2Can−1CunO2n+2+δ superconductors
✍ Scribed by J. Karpinski; H. Schwer; K. Conder; G.I. Meijer; E. Kopnin; R. Molinski
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 500 KB
- Volume
- 101-103
- Category
- Article
- ISSN
- 0167-2738
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✦ Synopsis
An overview is presented of the phase diagram and crystal growth investigations of Y,Ba,Cu,,,20 ,4+,~ and HgBa,Ca~~,Cn,~O,,,+,+, compounds synthesized at high pressure.
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In the process of searching for the phases of the Ag-Ba-Ca-Cu-O system at 1200 ° C under 5 GPa, we found the new oxycarbonate superconductors (Cuo.5Co.5) Ba2Can \_ ~CunO2~ + 3. Two members of the series with n = 3 and n = 4 were isolated as almost single phases; their structures are closely related
New high-temperature and nontoxic superconductor families of Ag 1-xCuxBa2Can-lCunO2n+3-y witl~ Tc = 117 K and CuBa2Can-lCunO2n+4-y with Tc =116 K were discovered. These materials were prepared by the highpressure technique. The highest Tc was obtained for n=4 i.e. Agl-xCuxBa2Ca3Cu4Oll.y (Ag-1234) an