Systematic study on crystal structure and properties of FeSr(2)LnCu(2)O(7+delta) (Ln = La, Nd, Sm, Eu, Gd, Dy, Ho, Er, and Yb)

IMR OpenIR

	Systematic study on crystal structure and properties of FeSr(2)LnCu(2)O(7+delta) (Ln = La, Nd, Sm, Eu, Gd, Dy, Ho, Er, and Yb)
	L. T. Yang; J. K. Liang; Q. L. Liu; H. M. Fan; G. B. Song; X. M. Feng; H. F. Yang; G. H. Rao
	2003
发表期刊	Chemistry of Materials
ISSN	0897-4756
卷号	15 期号:26 页码:4987-4995
摘要	The crystal structures of a series of new compounds with the composition FeSr(2)LnCu(2)O(7+delta) (Ln = La, Nd, Sm, Eu, Gd, Dy, Ho, Er, and Yb) that were successfully synthesized by solid-state reaction are investigated. The Rietveld refinement of the X-ray diffraction data shows that the samples exhibit a transition from a tetragonal system with space group P4/mmm for light rare earths Ln = La, Nd, Sm, Eu, and Gd to an orthorhombic system with space group Pmmm for heavy rare earths Ln = Dy, Ho, Er, and Yb. The oxygen contents of the samples are chemically determined by the iodometric titration. The room-temperature Mossbauer spectroscopy of (57)Fe in FeSr(2)GdCu(2)O(7+delta) is used to study the site distribution of Fe between the 1a and 2g sites in the as-synthesized in the air samples and O(2)-annealed samples, respectively. In the as-synthesized sample, there are about 67% of Fe ions residing in the la site, whereas in the 02-annealed sample, there are about 61% of Fe ions residing on the la site. Magnetization measurements indicate that Z changes with temperature in a Curie-type manner. Resistance measurements indicate that these samples have a semiconductor-like behavior and their band gap is related to their structural type and the radius of rare earth ions.
部门归属	chinese acad sci, inst phys, beijing 100080, peoples r china. chinese acad sci, ctr condensed matter phys, beijing 100080, peoples r china. acad sinica, int ctr mat phys, shenyang 110016, peoples r china.;yang, lt (reprint author), chinese acad sci, inst phys, pob 603, beijing 100080, peoples r china;ltyang@aphy.iphy.ac.cn jkliang@aphy.iphy.ac.cn
关键词	Ferromagnetic Superconductor Rusr2gdcu2o8 Neutron-diffraction Dc Magnetization Mossbauer Sites
URL	查看原文
WOS记录号	WOS:000187633100017
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/36113
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. T. Yang,J. K. Liang,Q. L. Liu,et al. Systematic study on crystal structure and properties of FeSr(2)LnCu(2)O(7+delta) (Ln = La, Nd, Sm, Eu, Gd, Dy, Ho, Er, and Yb)[J]. Chemistry of Materials,2003,15(26):4987-4995.
APA	L. T. Yang.,J. K. Liang.,Q. L. Liu.,H. M. Fan.,G. B. Song.,...&G. H. Rao.(2003).Systematic study on crystal structure and properties of FeSr(2)LnCu(2)O(7+delta) (Ln = La, Nd, Sm, Eu, Gd, Dy, Ho, Er, and Yb).Chemistry of Materials,15(26),4987-4995.
MLA	L. T. Yang,et al."Systematic study on crystal structure and properties of FeSr(2)LnCu(2)O(7+delta) (Ln = La, Nd, Sm, Eu, Gd, Dy, Ho, Er, and Yb)".Chemistry of Materials 15.26(2003):4987-4995.