Microhardness studies on BiCaSrCuO (2122) superconducting single crystals and pellets

Muralidhar Miryala, K. Narasimha Reddy, V. Hari Babu

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Abstract

Microhardness studies are made on single crystal of Bi2CaSr2Cu2O8+σ (BISCCO) and polycrystalline pellets of BISCCO containing different concentrations of impurity lead (Pb). Optical photomicrographs of single crystals and pellets are taken. The cleavage steps confirm the single crystalline nature of crystals whereas those of pellets show that they contain pores. XRD results confirm that the major phase is (2122). The load vs. hardness data show that the hardness has higher value at lower loads and decreases with increase in load upto 0.04 kg and remains almost the same thereafter. Increase in concentration of Pb also decreases the value of hardness. Temperature measurements indicate that the hardness decreases with increase in temperature (77 to 300 K) with no abnormality near the transition temperature. The results are explained in terms of intrinsic bond strength.

Original languageEnglish
Pages (from-to)115-120
Number of pages6
JournalPhysica Status Solidi (A) Applied Research
Volume126
Issue number1
Publication statusPublished - 1991 Jul
Externally publishedYes

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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