Synthese und Kristallstrukturen von Seltenerdmetall-Antimoniden des Palladiums / Synthesis and Crystal Structures of Antimonides of Rare-Earth Metals and Palladium

2006 ◽  
Vol 61 (1) ◽  
pp. 17-22 ◽  
Author(s):  
Anette Imre ◽  
Albrecht Mewis
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Three Dimensional ◽  
Earth Metal ◽  
Type Structure ◽  
X Ray ◽  
Metal Atoms ◽  
New Compounds ◽  
Ray Methods ◽  
The Rare Earth

The new compounds Pr3Pd6Sb5 (a = 13.442(3), b = 4.442(1), c = 9.994(2) Å ), Nd3Pd6Sb5 (a = 13.412(3), b = 4.431(1), c = 9.962(2) Å), and Gd3Pd6Sb5 (a = 13.293(2), b = 4.397(1), c = 9.881(2) Å) are isotypic and crystallize with the Ce3Pd6Sb5 type structure (Pmmn; Z = 2). The rare-earth metal atoms are arranged in form of three pseudo-body-centered subcells, whereas Pd and Sb atoms form a three-dimensional arrangement derived from the well-known ThCr2Si2 and CaBe2Ge2 structures. GdPdSb (a = 4.566(1), c = 7.444(1) Å) and DyPdSb (a = 4.545(1), c = 7.354(1) Å) crystallize with an ordered variant of the CaIn2 type structure (P63mc; Z = 2), also called as LiGaGe type, with slightly puckered hexagon nets of Pd and Sb atoms, which trigonally coordinate each other. In this series a decreasing radius of the rare-earth metal allows a tetrahedral non-metal environment of the Pd atoms and accordingly ScPdSb (a = 6.310(1) Å) forms the MgAgAs type structure (F4̄3m; Z = 4), a filled variant of the sphalerite type. The antimonides were prepared by heating mixtures of the elements at 600 °C and subsequent annealing at 900 - 1100 °C. Their structures have been determined by single-crystal X-ray methods.

Ternary Thallides REMgTl (Re = Y, La – Nd, Sm, Gd – Tm, Lu)

2005 ◽  
Vol 60 (3) ◽  
pp. 265-270 ◽  
Author(s):  
Rainer Kraft ◽  
Rainer Pöttgen
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Rare Earth Metal ◽  
High Frequency ◽  
Three Dimensional ◽  
Earth Metal ◽  
X Ray ◽  
Sample Chamber ◽  
Trigonal Prismatic Coordination ◽  
Trigonal Prismatic

The rare earth metal (RE)-magnesium-thallides REMgTl (RE = Y, La-Nd, Sm, Gd-Tm, Lu) were prepared from the elements in sealed tantalum tubes in a water-cooled sample chamber of a high-frequency furnace. The thallides were characterized through their X-ray powder patterns. They crystallize with the hexagonal ZrNiAl type structure, space group P62m, with three formula units per cell. Four structures were refined from X-ray single crystal diffractometer data: α = 750.5(1), c = 459.85(8) pm, wR2 = 0.0491, 364 F2 values, 14 variables for YMgTl; α = 781.3(1), c = 477.84(8) pm, wR2 = 0.0640, BASF = 0.09(2), 425 F2 values, 15 variables for LaMgTl; α = 774.1(1), c = 473.75(7) pm, wR2 = 0.0405, 295 F2 values, 14 variables for CeMgTl; a = 760.3(1), c = 465.93(8) pm, wR2 = 0.0262, 287 F2 values, 14 variables for SmMgTl. The PrMgTl, NdMgTl, GdMgTl, TbMgTl, and DyMgTl structures have been analyzed using the Rietveld technique. The REMgTl structures contain two cystallographically independent thallium sites, both with tri-capped trigonal prismatic coordination: Tl1Mg3RE6 and Tl2Mg6RE3. Together the magnesium and thallium atoms form three-dimensional [MgTl] networks with Mg-Mg distances of 327 and Mg-Tl distances in the range 299 - 303 pm (data for CeMgTl)

Li3Ce5Ge4, ein neuer Typ eines ternären Germanids des Lithiums mit Selten-Erd-Metallen Li3Ce5Ge4, a New Type of Ternary Compound of Lithium with Rare Earth Metal and Germanium

1979 ◽  
Vol 34 (9) ◽  
pp. 1234-1236 ◽  
Author(s):  
Axel Czybulka ◽  
Hans-Uwe Schuster
Keyword(s):  
Rare Earth ◽  
Ternary Compound ◽  
Rare Earth Metal ◽  
Three Dimensional ◽  
Earth Metal ◽  
Space Group ◽  
Metal Atoms ◽  
Dimensional Network ◽  
New Type ◽  
Group B

Abstract The ternary compound Li3Ce5Ge4 has been prepared and structurally characterized. It crystallizes orthorhombically (a = 1885 pm, b = 694.7 pm, c = 447.6 pm, space group B 2 mm). The structure shows germanium chains in a three-dimensional network of metal atoms.

Ternary Rare Earth Metal Gold Stannides and Indides with Ordered U3Si2 and Zr3Al2-Type Structure

1994 ◽  
Vol 49 (11) ◽  
pp. 1525-1530 ◽  
Author(s):  
Rainer Pöttgen
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Single Crystal ◽  
Crystal Chemistry ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Type Structure ◽  
X Ray ◽  
Arc Melting ◽  
Cscl Type

The new ternary stannides RE2Au2Sn (RE = Gd, Tb) and indides RE2Au2In (RE = Y, Gd-Tm, Lu) were synthesized by arc-melting of the elemental components and subsequent annealing at 800 °C. While Gd2Au2Sn, Tb2Au2Sn and the indides with RE = Y, Gd-Er crystallize in the ordered U3Si2 structure, Tm2Au2In and Lu2Au2In adopt the ordered Zr3Al2 structure, respectively. The crystal structure of Dy2Au2In was refined from single-crystal X- ray data: P4/mbm, Z = 2, a = 784.1(1) pm, c = 373.9(1) pm, V = 0.2299 nm3 and R = 0.028 for 342 F2 values and 12 variables. The tin (indium) atoms in these compounds occupy [RE8] square prisms and the gold atoms are surrounded by [RE6] trigonal prisms. These fragments are derived from the AlB2 and CsCl-type structures. The crystal chemistry of these com­pounds is briefly discussed.

Er2Au2Sn and other Ternary Rare Earth Metal Gold Stannides with Ordered Zr3Al2-Type Structure

1994 ◽  
Vol 49 (10) ◽  
pp. 1309-1313 ◽  
Author(s):  
Rainer Pöttgen
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Type Structure ◽  
Subsequent Annealing ◽  
X Ray ◽  
Cscl Type ◽  
Trigonal Prisms

AbstractThe ternary stannides RE2Au2Sn (RE = Y, Dy, Ho, Er, Tm, Lu) were prepared by arcmelting of the elemental components and subsequent annealing at 800 °C. The structure of Er2Au2Sn (single crystal, X-ray, P42/mnm, Z = 4, a = 778.2(2) pm, c = 739.6(3) pm, V = 0.4479 nm3 and R = 0.026) is described as the ternary ordered version of the Zr3Al2-type structure, a superstructure of the U3Si2-type. It consists of two-dimensionally infinite layers (Au2Sn)n which are separated by the erbium atoms. The structure is built up from slightly distorted [SnEr8) square prisms and [AuEr6] trigonal prisms which are condensed in all three directions. These fragments are derived from the well known AlB2 and CsCl-type structures.

Osmium and magnesium: structural segregation in the rare earth-rich intermetallics RE4OsMg (RE=La–Nd, Sm) and RE9TMg4 (RE=Gd, Tb)

2019 ◽  
Vol 74 (6) ◽  
pp. 519-525 ◽  
Author(s):  
Theresa Block ◽  
Sebastian Stein ◽  
Lukas Heletta ◽  
Rainer Pöttgen
Keyword(s):  
Rare Earth ◽  
Powder Diffraction ◽  
Rare Earth Metal ◽  
Rare Earth Metals ◽  
Three Dimensional ◽  
Earth Metal ◽  
Intermetallic Phases ◽  
Induction Melting ◽  
X Ray ◽  
Dimensional Network

AbstractTernary rare earth metal-rich intermetallic phases containing osmium and magnesium were obtained by induction melting of the elements in sealed niobium ampoules under argon followed by annealing in muffle furnaces. The large rare earth elements form the series of Gd4RhIn-type (F4̅3m) intermetallicsRE4OsMg withRE = La–Nd and Sm, while the smaller rare earth metals gadolinium and terbium form the Y9CoMg4-type (P63/mmc) phases Gd9OsMg4and Tb9OsMg4. All samples were characterized by X-ray powder diffraction (Guinier technique). The structures of Ce4Os0.973Mg1.027(a = 1406.54(7) pm,wR2 = 0.0478), Nd4Os0.978Mg1.022(a = 1402.00(7) pm,wR2 = 0.0463), Sm4Os0.920Mg1.080(a = 1387.33(5) pm,wR2 = 0.0378) and Gd9OsMg4(a = 971.01(5),c = 980.43(5) pm,wR2 = 0.0494) were refined from single-crystal X-ray diffractometer data. The threeRE4OsMg phases show small degrees of Os/Mg mixing, as is frequently observed for Rh/In in Gd4RhIn-type intermetallics. The basic building units in both structures are osmium-centeredRE6trigonal prisms that are condensed with emptyRE6octahedra. The magnesium atoms in both types build Mg4tetrahedra. The latter are isolated (312 pm Mg–Mg in Ce4OsMg) and incorporated within the three-dimensional network of prisms and octahedra in theRE4OsMg phases while one observes rows of corner- and face-sharing tetrahedra in Gd9OsMg4(305 and 314 pm Mg–Mg). In both structure types direct Os–Mg bonding is not observed.

X-ray investigation of the rare earth metal-iron triad metal-boron systems

1983 ◽  
Vol 90 (2) ◽  
pp. 217-222 ◽  
Author(s):  
Yu.B. Kuz'ma ◽  
N.S. Bilonizhko ◽  
N.F. Chaban ◽  
G.V. Chernyak
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
X Ray ◽  
The Rare Earth

ChemInform Abstract: X-RAY INVESTIGATION OF THE RARE EARTH METAL-IRON TRIAD METAL-BORON SYSTEMS

1983 ◽  
Vol 14 (30) ◽  
Author(s):  
YU. B. KUZ'MA ◽  
N. S. BILONIZHKO ◽  
N. F. CHABAN ◽  
G. V. CHERNYAK
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
X Ray ◽  
The Rare Earth

Magnetic x‐ray scattering studies of the rare‐earth metal holmium (invited)

1985 ◽  
Vol 57 (8) ◽  
pp. 3619-3622 ◽  
Author(s):  
Doon Gibbs ◽  
D. E. Moncton ◽  
K. L. D’Amico
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
X Ray ◽  
X Ray Scattering ◽  
The Rare Earth ◽  
Ray Scattering

The Effect of Rare Earth on the Clearance of Carbon during High Speed Polishing of Diamond Films

2011 ◽  
Vol 697-698 ◽  
pp. 137-141
Author(s):  
Li Zhou ◽  
Shu Tao Huang ◽  
L.F. Xu
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
High Speed ◽  
Diamond Films ◽  
Earth Metal ◽  
Metal Plate ◽  
X Ray ◽  
Clearance Mechanism ◽  
Before And After ◽  
The Rare Earth

A new setup for polishing of diamond films on a high speed rotating stainless plate has been developed, and a rare earth metal plate was used to clear the carbon atoms diffused into the polishing plate. The surface morphology and clearance mechanism were studied by using scanning electron microscopy and X-ray photo-electron spectroscopy before and after polishing, respectively. The results showed that the chemical reaction between the rare earth metal and carbon diffused into the polishing plate took place and the rare earth metal could clear the carbon element effectively during the super-high speed polishing.

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