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MONITORING PHASE FORMATION OF LEAD-SUBSTITUTED BSCCO SUPERCONDUCTING SAMPLES AT DIFFERENT PREPARATIVE STAGES USING RAMAN SPECTROSCOPY AND X-RAY DIFFRACTION.

Author(s) : KAO S., NG K. Y. S.

Type of article: Article

Summary

MAJOR REACTIONS INVOLVING BISMUTH OXIDE OCCURRED AT AROUND 973 K (700 DEG C) AND REACTIONS WITH CALCIUM, COPPER AND LEAD STARTED AT A LOWER TEMPERATURE. THE AMOUNT OF CALCIUM-LEAD OXIDE FORMED INCREASES AS A FUNCTION OF LEAD CONCENTRATION AND ANNEALING TEMPERATURE: UP TO 1073 K (800 DEG C), BUT EXCESS LEAD SUBSTITUTION (50 %) DESTROYS THE SUPERCONDUCTIVITY. THE HIGH-TEMPERATURE SUPERCONDUCTING PHASE (2223) IS ONLY OBSERVED IN THE 15 AND 20 % LEADED SAMPLES. THESE 2 SAMPLES EXHIBIT A HIGHER AMOUNT OF CALCIUM-LEAD OXIDE DURING INTERMEDIATE PROCESSING STAGES, WHICH SUGGESTS THAT THE PRESENCE OF THIS COMPOUND IS IMPORTANT FOR THE FORMATION OF THE HIGH-CRITICAL TEMPERATURE PHASE.

Details

  • Original title: MONITORING PHASE FORMATION OF LEAD-SUBSTITUTED BSCCO SUPERCONDUCTING SAMPLES AT DIFFERENT PREPARATIVE STAGES USING RAMAN SPECTROSCOPY AND X-RAY DIFFRACTION.
  • Record ID : 1992-0981
  • Languages: English
  • Source: J. Supercond. - vol. 4 - n. 2
  • Publication date: 1991/04
  • Document available for consultation in the library of the IIR headquarters only.

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