Synthesis of the three Cu-O layered Tl-(Pb,Bi)-Sr-Ca-Cu-O compound
Y T Huang; S F Wu; C K Chiang; W M Hurng; H S Koo; W H Lee; Y T Huang; Mater. Res. Lab., Ind. Technol. Res. Inst., Hsinchu, Taiwan; S F Wu; Mater. Res. Lab., Ind. Technol. Res. Inst., Hsinchu, Taiwan; C K Chiang; Mater. Res. Lab., Ind. Technol. Res. Inst., Hsinchu, Taiwan; W M Hurng; Mater. Res. Lab., Ind. Technol. Res. Inst., Hsinchu, Taiwan; H S Koo; Mater. Res. Lab., Ind. Technol. Res. Inst., Hsinchu, Taiwan; W H Lee; Mater. Res. Lab., Ind. Technol. Res. Inst., Hsinchu, Taiwan
Журнал:
Superconductor Science and Technology
Дата:
1991-02-01
Аннотация:
A three Cu-O layered superconducting compound in the Tl-(Pb,Bi)-Sr-Ca-Cu-O system has been prepared by different processes. These include the use of excess Ca and Cu for off-stoichiometric composition, and the increase in Ca/Sr ratio for modified stoichiometric composition. A nearly single phase of 1223 superconductor can be obtained within three hours of heat treatment using the modified stoichiometric composition, whereas the intermediate phase (Ca,Sr)<sub>2</sub>CuO<sub>3</sub> was remarkably accompanied in other synthetic processes. Observations were also corroborated by X-ray diffraction and magnetization measurements.
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