Microhardness Studies on BiCaSrCuO (2122) Superconducting Single Crystals and Pellets

M. Muralidhar; K. Narasimha Reddy; V. Hari Babu

doi:10.1002/pssa.2211260111

Microhardness Studies on BiCaSrCuO (2122) Superconducting Single Crystals and Pellets

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

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

Microhardness studies are made on single crystal of Bi₂CaSr₂Cu₂O₈₊_δ (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 language	English
Pages (from-to)	115-120
Number of pages	6
Journal	physica status solidi (a)
Volume	126
Issue number	1
DOIs	https://doi.org/10.1002/pssa.2211260111
Publication status	Published - 1991 Jul 16
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Microhardness Studies on BiCaSrCuO (2122) Superconducting Single Crystals and Pellets",

abstract = "Microhardness studies are made on single crystal of Bi2CaSr2Cu2O8+δ (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.",

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AU - Muralidhar, M.

AU - Reddy, K. Narasimha

AU - Hari Babu, V.

PY - 1991/7/16

Y1 - 1991/7/16

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AB - Microhardness studies are made on single crystal of Bi2CaSr2Cu2O8+δ (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.

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Microhardness Studies on BiCaSrCuO (2122) Superconducting Single Crystals and Pellets

Abstract

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