Effect of annealing on properties of bismuth based high Tc superconductors

Masayuki Nagai, Tadashi Nishino, Takeo Hattori, Motohide Matsuda, Masasuke Takata

    Research output: Contribution to journalArticlepeer-review


    A novel method to increase the amount of the 110 K phase in the Bi-Sr-Ca-Cu-O system was examined. After the sample with composition of Bi2Sr2CaCu2Ox had been calcined, it was soaked in ethanol containing copper acetate and calcium acetate, the amounts of which were determined to give the composition of Bi2Sr2Ca2Cu3Oy after sintering. Subsequently, annealing at about 400 °C was conducted to examine the stability of the 110 K phase. The sample containing mainly the 80 K phase and a small amount of the 110 K phase showed an increase in the amount of the 110 K phase while that containing only the 80 K phase showed no change. Therefore, it is presumed that the 110 K phase may grow when the excess calcium and copper coexist adjacent to the 80 K phase at relatively low temperatures such as 400 °C.

    Original languageEnglish
    Pages (from-to)5681-5684
    Number of pages4
    JournalJournal of Materials Science
    Issue number21
    Publication statusPublished - 1991 Nov 1

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering


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