Composition and structure refinement of superconducting crystals Y1-x Tb x Ba2Cu3O6+δ (x=0.10; δ=0.75)

被引：0
|
作者：
Kozeeva, L. P. [1 ]
Podberezskaya, N. V. [1 ]
Kuratieva, N. V. [1 ]
Kamaneva, M. Yu. [1 ]
Blinov, A. G. [1 ]
机构：
[1] Russian Acad Sci, AV Nikolaev Inst Inorgan Chem, Siberian Div, Novosibirsk, Russia
来源：
JOURNAL OF STRUCTURAL CHEMISTRY | 2008年 / 49卷 / 06期
关键词：
superconducting crystals Ln123; (Y/Tb) 123 crystals; crystallization; structure; solid solutions; superconductivity;
D O I：
10.1007/s10947-008-0179-0
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Crystals of Y0.90Tb0.10Ba2Cu3O6.75 have been prepared by spontaneous crystallization from slowly cooled non-stoichiometric melt of the system Y-Tb-Ba-Cu-O. Average size of platelet crystals having mirror surface is 2x2, the largest - 8x9 mm with thickness 0.1-0.2 mm. The crystals have been characterized by powder X-ray diffraction and electron microprobe analysis. Tetragonal symmetry of the crystals has been determined by X-ray diffraction. Magnetic susceptibility measurements have revealed that the crystals manifest transition to superconducting state without additional annealing (T (c) = 60 K). Structures and compositions - Y/Tb ratio (sigma = 0.01) and oxygen content (sigma = 0.04) - have been refined for two single crystals. Possibility of rhombic distortion of the tetragonal symmetry is discussed.
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收藏
页码：1064 / 1070
页数：7
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