THERMAL-EXPANSION OF Y2BA4CU7O15 IN THE TEMPERATURE-RANGE 10-290-K, AND COMPARISON WITH YBA2CU3O7 AND YBA2CU4O8

被引：11

作者：

ALEXANDROV, OV

FRANCOIS, M

GRAF, T

YVON, K

机构：

[1] UNIV GENEVA,CRISTALLOG LAB,CH-1211 GENEVA,SWITZERLAND

[2] UNIV GENEVA,DEPT PHYS MAT CONDENSEE,CH-1211 GENEVA,SWITZERLAND

来源：

PHYSICA C | 1991年 / 172卷 / 5-6期

关键词：

D O I：

10.1016/0921-4534(91)90219-O

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The orthorhombic lattice parameters of superconducting Y2Ba4Cu7O15.28 (T(c) = 85.5 K) are measured as a function of temperature (10-290 K) to a precision of 1 x 10(-4) on a low-temperature Guiner X-ray powder diffractometer by using an internal standard. The thermal expansion is anisotropic ((a297K-a10K)/a297K = 17(2) x 10(-4), (b297K-b10K)/b297K = 11(2) x 10(-4). (c297K-c10K)/c297K = 34(2) x 10(-4) and intermediate between that of structurally related YBa2Cu3O7 and YBa2Cu4O8. It is attributed to anharmonic thermal vibrations of the CuO2-planes and CuO single- and double-chains in the directions of vacant oxygen sites. No anomalous changes as a function of temperature are found within experimental resolution.

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页码：491 / 494

页数：4

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