Dysprosium physical properties

Ionic radius Dy,+ 0.908 A. Metallic radius 1.775 A. First ionization potential 5.93 eV second 11.67 eV. Dysprosium appears to he exclusively trivalcnt. Other important physical properties of dysprosium arc given under Rare-Earth Elements and Metals. 

It is possible to include yttrium among the rare earths, because of its properties, which are rather like those of some of the rare earths. For instance, when we express a physical property of the sulfides as a function of the ionic radii of the metals, the yttrium sulfide normally lies among the rare earth series, without any discontinuity, between dysprosium and erbium sulfides. 

Lanthanide elements (referred to as Ln) have atomic numbers that range from 57 to 71. They are lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu). With the inclusion of scandium (Sc) and yttrium (Y), which are in the same subgroup, this total of 17 elements are referred to as the rare earth elements (RE). They are similar in some aspects but very different in many others. Based on the electronic configuration of the rare earth elements, in this chapter we will discuss the lanthanide contraction phenomenon and the consequential effects on the chemical and physical properties of these elements. The coordination chemistry of lanthanide complexes containing small inorganic ligands is also briefly introduced here [1-5]. 

The materials derived from YBa2Cu307 by replacing yttrium with other rare earth elements (lutetium, ytterbium, thulium, erbium, hohnium, dysprosium, gadolinium, europium, samarium, neodymium, lanthanum) are also superconductors, with r, s of 88 to 96 K. The crystal structures of RBa2Cu307 are almost the same as those of YBa2Cu307. The lattice constant is slightly different for the different ionic radii of the rare earth elements, and yet their chemical and physical properties are almost the same as those of YBa2Cu307. 

More recently, D. Gatteschi et al. have reported on a dysprosium-nitronyl nitroxide ID compound with interesting dynamic properties [76]. Their work illustrates nicely how presently coordination chemistry can modulate a known system [Dy(hfac)3NITEt] [77-80] (with hfac hexa-fluoroacetylacetonate and NITEt 4 -ethyl-4,4,5,5-tetramethylimidazoline-l-oxyl-3-oxide) to achieve fine control of the physical properties. [Dy(hfac)3 NITEt] is composed of alternating chains of Dy(hfac)3 units and NITEt radicals. This compound displays a transition to a three-dimensional mag-... 

In Chapters I and 2, an introduction is made to the synchrotron Mossbauer spectroscopy with examples. Examples include the/ns/tu Mossbauer spectroscopy with synchrotron radiation on thin films and the study of deep-earth minerals. Investigations of in-beam Mossbauer spectroscopy using a Mn beam at the RIKEN RIBF is presented in Chapter 3. This chapter demonstrates innovative experimental setup for online Mossbauer spectroscopy using the thermal neutron capture reaction, Fe (n, y) Fe. The Mossbauer spectroscopy of radionuclides is described in Chapters 4-7. Chapter 4 gives full description of the latest analysis results of lanthanides Eu and Gd) Mossbauer structure and powder X-ray diffraction (XRD) lattice parameter (oq) data of defect fluorite (DF) oxides with the new defect crystal chemistry (DCC) Oq model. Chapter 5 reviews the Np Mossbauer and magnetic study of neptunyl(+l) complexes, while Chapter 6 describes the Mossbauer spectroscopy of organic complexes of europium and dysprosium. Mossbauer spectroscopy is presented in Chapter 7. There are three chapters on spin-state switching/spin-crossover phenomena (Chapter 8-10). Examples in these chapters are mainly on iron compounds, such as iron(lll) porphyrins. The use of Mossbauer spectroscopy of physical properties of Sn(ll) is discussed in Chapter I I. 

TABLE 3.3 Selected Physical Properties nf FAlthfipl l- Ionic Liquids TABLE 3.4 Selected Physical Properties nf Tetrahaloferrate Ionic Liquids TABLE 3.5 Selected Physical Properties nf Lanthanide-hased Ionic Liquids TABLE 3.6 Magnetic Properties of Some Dysprosium-Based Ionic Liquids Chapter 06... 

Chatterjee and Taylor (1972) examined physical properties associated with different crystal structures in the neodymium-dysprosium alloy system. The purity of their starting metals was not reported. Alloys were prepared by arc melting the... 

Figure 11.28 (a and b) UV-vis absorption spectra of ligand TP and PM. (c) Photoluminescence spectra include excitation and (d) emission of the complex Dy(PM)3 (TP)2 [75]. (Reprinted with permission from Z.F. Li et al., Synthesis, structure, photoluminescence, and electroluminescence properties of a new dysprosium complex, The Journal of Physical Chemistry C, 111, 2295-2300, 2007. 2007 American Chemical Society.)... 

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