Ｂｉ‐Ｐｂ‐Ｓｒ‐Ｃａ‐Ｃｕ‐Ｏ系高温相の化学的および機械的安定性　（Ｉ）　粉砕粉の熱処理効果

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タイトル別名
  • Chemical and Mechanical Stability of the High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System. (I). Effects of Heat Treatment of Crushed Powder of the High-Tc Phase.
  • Bi Pb Sr Ca Cu Oケイ コウオンソウ ノ カガクテキ オヨビ キ
  • Effects of Heat Treatment of Crushed Powder of the High-Tc Phase
  • 粉砕粉の熱処理効果

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Chemical and mechanical stability of the high-Tc phase has been studied for the samples of Bi0.9Pb0.2Sr1.0Ca1.0Cu1.6Ox. Mechanical grinding converts the high-Tc phase into a nonsuperconducting amorphous phase. The ground high-Tc phase is not stabilized on annealing at lower temperatures below 820°C. Annealing at lower temperature leads to precipitation of some impurity phases and the low-Tc phase which depends on annealing temperature and time. The high-Tc phase is recovered by annealing at 850°C. The lattice parameters a and c of the high-Tc phase annealed at 850°C are longer than those below 820°C.

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