12133-07-2Relevant academic research and scientific papers
Atomic structure of thin dysprosium-silicide layers on Si(1 1 1)
Engelhardt,Preinesberger,Becker,Eisele,D?hne
, p. 755 - 761 (2006)
We report on scanning tunneling microscopy results of thin dysprosium-silicide layers formed on Si(1 1 1). In the submonolayer regime, both a 23×23R30° and a 5 × 2 superstructure were found. Based on images taken at different tunneling conditions, a structure model could be developed for the 23×23R30° superstructure. For one monolayer, a 1 × 1 superstructure based on hexagonal DySi2 was observed, while several monolayers thick films are characterized by a 3×3R30° superstructure from Dy3Si5.
A two-phase magnetic structure of DySi2
Semitelou
, p. 42 - 45 (2003)
Neutron diffraction performed on the powder binary DySi2 had shown that, at room temperature, the crystal structure could be described by adopting the orthorhombic Imma system with two sites 4e and 8h for Dy and Si, respectively. At 2 K, the antiferromagnetic nature of the compound is confirmed. Two distinct magnetic phases are found with propagation vectors k1 = [0,0,0] and k2 = [1/2,2/2,0] with non-collinear magnetic moments μ1 = 3.58(4)μB and μ2 = 3.34(2)μB.
The ternary RE-Si-B systems (RE = Dy, Ho, Er and Y) at 1270 K: Solid state phase equilibria and magnetic properties of the solid solution REB2-xSix (RE = Dy and Ho)
Roger, Jérome,Babizhetskyy, Volodymyr,Guizouarn, Thierry,Hiebl, Kurt,Guérin, Roland,Halet, Jean-Fran?ois
, p. 72 - 84 (2008/10/09)
The solid state phase equilibria in the ternary RE-Si-B diagrams (RE = Dy, Ho, Er and Y) were determined at 1270 K using experimental techniques such as X-ray diffraction, scanning electron microscopy and electron probe microanalysis. In general, three ternary phases were obtained for each diagram: the line compound RE5Si2B8 with tetragonal symmetry, the boron-inserted Nowotny phase RE5Si3Bx of Mn5Si3-type and the solid solution REB2-xSix of AlB2-type. Prior to this work, the binary systems RE-Si and RE-B, which form the boundary of each diagram, were also re-investigated. In addition to the structures of RE5Si3 (Mn5Si3-type, RE = Dy, Ho and Y) and Dy3Si4 (Ho3Si4-type) which were previously reported or will be presented in a forthcoming paper, the X-ray single crystal structures of RE5Si4 (Sm5Ge4-type, RE = Dy and Ho), DySi (CrB-type) and HoSi in both polymorphic modifications, i.e. the FeB- (high temperature) and CrB- (low temperature) types, were determined and are described herein. Structural relationships between members of the same series on one side, and between both forms of HoSi on the other side, are also discussed in terms of coordination polyhedra and interatomic distances. Finally, magnetic measurements were performed on the alloys REB2-xSix, which in case of RE = Dy exhibit a marked increase of the magneto-crystalline anisotropy, whereas for RE = Ho a change from ferromagnetic to antiferromagnetic behaviour with increasing silicon content is encountered.
Dy-Sb-Si system at 1100 K and ternary intermetallic phases in the Dy-Sb-Si and Gd-Sb-Si systems
Morozkin
, p. L6-L8 (2008/10/08)
Physicochemical analysis techniques, including X-ray phase analysis and electron probe X-ray analysis were employed in constructing the isothermal section of the Dy-Sb-Si system at 1100 K. The ternary intermetallic phases Dy55Sb16Si28 [a=0.7746(3) nm, b=1.4853(5) nm, c=0.7761(3) nm], Dy55Sb31Si13 [a=0.7802(3) nm, 1.4972(4) nm, c=0.7817(2) nm] and Gd55Sb15Si29 [a=0.7892(5) nm, b=1.5128(7) nm, c=0.7925(5) nm] crystallize in the orthorhombic Sm5Ge4-type structure (space group Pnma; no. 62). Gd62Sb20Si18 [a=0.8759(2) nm, c=0.6363(1) nm] crystallizes in the hexagonal Mn5Si3-type structure (space group P63/mcm; no. 193).
Phase equilibria in the Dy-V-Si system at 1200 K
Morozkin
, p. L4-L6 (2008/10/08)
Phase equilibria in the Dy-V-Si system were investigated by X-ray powder diffraction and metallographic analysis. The isothermal cross-section at 1200 K was obtained. It is obvious that the AlB2-type (space group P6/mmm, no. 191) DyV0.1Si1.9 compound [a=0.3817(1) nm, c=0.4114(1) nm] belongs to the extended region of an AlB2-type DySi1.56-based solid solution.
Phase equilibria in the Dy-Ti-Si system at 1200 K
Morozkin
, p. 155 - 157 (2008/10/08)
Phase equilibria in the Dy-Ti-Si system were investigated by X-ray powder diffraction, local X-ray spectral analysis, metallographic analysis and the isothermal cross-section at 1200 K was obtained. The CeFeSi-type (space group P4/nmm, No. 129) DyTiSi compound has been confirmed. The new Sc2Re3Si4-type (space group P41212, No. 92) compound Dy2Ti3Si4 [a=0.6977(1) nm, c=1.2814(2) nm] was found. It is obvious that the AlB2-type (space group P6/mmm, No. 191) compound DyTi0.3Si1.7 [a=0.3824(1) nm, c=0.4119(1) nm] belongs to an extended region of the AlB2-type DySi1.56-based solid solution.
SYNTHESIS OF METAL SILICIDE POWDERS BY THERMOLYSIS OF METAL CHLORIDESI WITH MAGNESIUM SILICIDE
Fitzmaurice, Jonathan C.,Hector, Andrew L.,Parkin, Ivan P.,Rowley , Adrian T.
, p. 47 - 56 (2007/10/02)
Thermolysis (850 deg C) of a mixture of Mg2Si and MCln (M= Y,Gd,Dy,Ho,Ti,Zr,Hf,Nb,Ta, Mo,W,Fe,Pt; n=3,4,5) produces metal silicides MxSiy, as microcrystalline powders.The reactions give a useful insight into mechanisms working in this type of reaction. Key words: Metal silicide, metal chlorides, magnesium silicide, powder diffraction, thermolysis.
MAGNETIC PROPERTIES OF RARE EARTH DISILICIDES RSi//2.
Pierre, J.,Siaud, E.,Frachon, D.
, p. 321 - 330 (2008/10/08)
The magnetic properties of the rare earth disilicides (RSi//2) have been re-investigated. We confirm the occurrence of ferromagnetism in PrSi//2 and antiferromagnetism in GdSi//2, TbSi//2 and HoSi//2. NdSi//2 orders at T//N equals 10 K and ErSi//2 orders
