Bulk thermal expansion studies of BiCaSrCu2Oxand Bi2CaSr2Cu2Ox

✍ Scribed by A. C. Momin; E. B. Mirza; M. D. Mathews

• Book ID: 104788192
• Publisher: Springer
• Year: 1991
• Tongue: English
• Weight: 253 KB
• Volume: 12
• Category: Article
• ISSN: 0195-928X
• DOI: 10.1007/bf00502371

✦ Synopsis

The compounds BiCaSrCu20 x and Bi2CaSr2Cu20 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 YBazCu307. The XRD analysis shows that both BiCaSrCu20 x and Bi2CaSr2Cu~O ~ are single phase in nature, having an orthorhombic symmetry. The /~TG analysis carried out in oxygen, air, and nitrogen shows negligible weight loss (~0.1%) on heating to 1073 K, indicating that these two compounds, unlike YBazCu307, are quite stable. The analysis of bulk thermal expansion data reveals that the average linear thermal expansion coefficient (cq) for both BiCaSrCu2Ox and BizCaSr2Cu20 x is almost the same (~ 10.5 x 10 6K 1) and is found to be nearly half of that for YBazCu307 (cq 18 x 10 -6 K-1), suggesting that the interatomic bonding in both BiCaSrCu20 x and Bi2CaSrzCu 20~, is stronger as compared to YBazCu307.