Bulk thermal expansion studies of BiCaSrCu2O
x
and Bi2CaSr2Cu2O
x |
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Authors: | A C Momin E B Mirza M D Mathews |
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Affiliation: | (1) Applied Chemistry Division, Bhabha Atomic Research Centre, 400085 Trombay, Bombay, India |
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Abstract: | The compounds BiCaSrCu2O
x
and Bi2CaSr2Cu2O
x
were prepared by ceramic techniques and characterized by X-ray powder diffractometry (XRD) and microthermogravimetry ( TG) and their bulk thermal expansion measurements were carried out using dilatometry in the temperature range 298 T 1073 K in air. The results have been analyzed and are compared with those obtained earlier for YBa2Cu3O7. The XRD analysis shows that both BiCaSrCu2O
x
and Bi2CaSr2Cu2O
x
are single phase in nature, having an orthorhombic symmetry. The TG analysis carried out in oxygen, air, and nitrogen shows negligible weight loss (R~0.1%) on heating to 1073 K, indicating that these two compounds, unlike YBa2Cu3O7, are quite stable. The analysis of bulk thermal expansion data reveals that the average linear thermal expansion coefficient (
1) for both BiCaSrCu2O
x
and Bi2CaSr2Cu2O
x
is almost the same (
1 10.5×10–6 K–1) and is found to be nearly half of that for YBa2Cu3O7 (
1 18×10–6 K–1), suggesting that the interatomic bonding in both BiCaSrCu2O
x
and Bi2CaSr2Cu2O
x
is stronger as compared to YBa2Cu3O7. |
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Keywords: | BiCaSrCu2O
x
Bi2CaSr2Cu2O
x
ceramics dilatometry thermal expansion |
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