PROPERTIES OF A NEW COPPER TERNARY COMPOUND LA2SR6CU8O18-DELTA

被引：22
作者：
FU, WT
XU, Q
VERHEIJEN, AA
VANRUITENBEEK, JM
ZANDBERGEN, HW
DEJONGH, LJ
机构：
[1] LEIDEN STATE UNIV,GORLAEUS LABS,2312 AV LEIDEN,NETHERLANDS
[2] NATL CTR HREM,MAT SCI LAB,2628 AL DELFT,NETHERLANDS
来源：
SOLID STATE COMMUNICATIONS | 1990年 / 73卷 / 04期
关键词：
D O I：
10.1016/0038-1098(90)90738-W
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
A new ternary compound La2Sr6Cu8O18-δ has been isolated and characterized by X-ray diffraction and electron diffraction. It crystalizes in a tetragonal unit cell, space group P4212 or P[ovbar|4]21m, with the a-axis related to that of cubic perovskite (ap) by a≈2√2ap, but with the c-axis slightly shorter than ap. The oxygen content determined from TGA was found to vary strongly, depending on the post-annealing conditions. Air-annealed samples (δ≈0.4) show metallic conductivities, however air-quenched samples (δ≈2) are considerabaly less conducting, and show a weak upturn in the resistivity at low temperature. No superconductivity is observed down to 4K. Thermogravimetric analysis, d.c. resistivity and a.c. susceptibility data as a function of temperature are presented, and the structural features are discussed. © 1990.
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页码：291 / 295
页数：5
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