THE ROLE OF HIGH-PRESSURE SINTERING IN PREPARING HIGH-QUALITY N-TYPE ND2-XCEXCUO4-Y SUPERCONDUCTORS

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	THE ROLE OF HIGH-PRESSURE SINTERING IN PREPARING HIGH-QUALITY N-TYPE ND2-XCEXCUO4-Y SUPERCONDUCTORS
	C. Q. Jin; W. L. Zhou; H. Gu; Y. S. Yao; W. K. Wang
	1993
发表期刊	Journal of Applied Physics
ISSN	0021-8979
卷号	73 期号:2 页码:843-849
摘要	High-pressure high-temperature sintering (HHS) under 1.0, 2.0, 4.0, and 6.0 GPa for a short time was directly used to reduce n-type Nd1.85Ce0.15CuO4-y. Superconductors with higher critical temperature were obtained. The samples display lower resistivity, and more metalliclike resistance behavior at normal state with increasing sintering pressure. A small increase of lattice parameter and cell volume was observed via electron and x-ray diffraction. Transmission electron microscopy studies also show that there is a preferential orientation along the c axis among the neighboring grains. This helps get well-matching grain boundaries in the HHS samples. A Cu2O high-pressure phase was found via energy-dispersive x-ray analysis in the sample treated above 5.0 GPa, which is thought to be a deleterious factor for superconductivity. Sintering under suitable pressure not only enhances the intragranular conductivity, but also effectively improves the intergranular links. Finally, via the assumed interstitial oxygen ordering in the T' structure, a possible mechanism of n-type reduction is proposed based on the change in tolerance factor under reduction atmosphere and high pressure.
部门归属	chinese acad sci,beijing electron microscopy lab,beijing 100080,peoples r china. chinese acad sci,natl lab supercond,beijing 100080,peoples r china. acad sinica,int ctr mat phys,shenyang 110015,peoples r china.;jin, cq (reprint author), chinese acad sci,inst phys,beijing 100080,peoples r china
关键词	Cu-o System Quasihydrostatic Pressure Transition Nd1.85ce0.15cuo4-delta Temperature Transport Compound Crystals Oxygen Growth
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/39046
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	C. Q. Jin,W. L. Zhou,H. Gu,et al. THE ROLE OF HIGH-PRESSURE SINTERING IN PREPARING HIGH-QUALITY N-TYPE ND2-XCEXCUO4-Y SUPERCONDUCTORS[J]. Journal of Applied Physics,1993,73(2):843-849.
APA	C. Q. Jin,W. L. Zhou,H. Gu,Y. S. Yao,&W. K. Wang.(1993).THE ROLE OF HIGH-PRESSURE SINTERING IN PREPARING HIGH-QUALITY N-TYPE ND2-XCEXCUO4-Y SUPERCONDUCTORS.Journal of Applied Physics,73(2),843-849.
MLA	C. Q. Jin,et al."THE ROLE OF HIGH-PRESSURE SINTERING IN PREPARING HIGH-QUALITY N-TYPE ND2-XCEXCUO4-Y SUPERCONDUCTORS".Journal of Applied Physics 73.2(1993):843-849.