ChemInform Abstract: RGA6 (R = RARE EARTH ATOM), A COMMON INTERMETALLIC COMPOUND OF THE RARE EARTH-GALLIUM SYSTEMS

1982 ◽  
Vol 13 (5) ◽  
Author(s):  
J. PELLEG ◽  
G. KIMMEL ◽  
D. DAYAN
Keyword(s):  
Rare Earth ◽  
Intermetallic Compound ◽  
Rare Earth Atom ◽  
The Rare Earth

Structure and stereochemistry in 'f-block' complexes of high coordination number. VIII. The [M(unidentate)9] system. Crystal structures of [M(OH2)9] [CF3SO3]3, M = La, Gd, Lu, Y

1983 ◽  
Vol 36 (3) ◽  
pp. 483 ◽  
Author(s):  
JM Harrowfield ◽  
DL Kepert ◽  
JM Patrick ◽  
AH White
Keyword(s):  
Rare Earth ◽  
Crystal Structures ◽  
Ethyl Sulfate ◽  
Rare Earth Atom ◽  
Repulsion Energy ◽  
High Coordination Number ◽  
Tricapped Trigonal Prism ◽  
Cell Dimensions ◽  
High Coordination ◽  
The Rare Earth

The crystal structures of the nonahydrates of the rare earth trifluoromethanesulfonates, [M(OH2)9] [CF3SO3]3 have been determined at 295 K for the configurations fO, f7, f14, i.e. M = La, Gd, Lu, together with that of the yttrium analogue. The structures are similar to those of the rare earth ethyl sulfate nonahydrates, belonging to space group P6,/m (hexagonal) with cell dimensions a ≈ 13.7, c ≈ 7.5 �, Z 2, with the coordination about the rare earth atom being a tricapped trigonal prism. The structure is compared with that found from repulsion energy calculations.

Structure of Rare-earth/Alkali Halide Complexes

2001 ◽  
Vol 56 (11) ◽  
pp. 721-724 ◽  
Author(s):  
Z. Akdeniz ◽  
Z. Çiçek Önem ◽  
M. P. Tosia
Keyword(s):  
Rare Earth ◽  
Alkali Halide ◽  
Elevated Temperatures ◽  
Alkali Halides ◽  
Energy Difference ◽  
Alkali Atom ◽  
Complexing Agent ◽  
Coordination State ◽  
Rare Earth Atom ◽  
The Rare Earth

Abstract Vapour complex formation of rare-earth halides with alkali halides strongly increases the volatility of these compounds. We evaluate the structure taken by such complexes having the chemical formulas MRX4, M2RX5 and M3RX6, where X = F or Cl and typically M = Li or Na and R = La. The roles played by the two types of metal atom is investigated in MRX4 complexes by also taking M = K, Rb or Cs and R = Gd or Lu. The main predictions that emerge from our calculations are as follows: (i) in MRX4 a fourfold coordination of the rare-earth atom is accompanied by twofold or threefold coordination of the alkali atom, the energy difference in favour of the twofold-coordination state being about 0.3 eV in the case of the LiF complexing agent but even changing sign as the ionic radius of either the alkali or the halogen is increased; (ii) in M2RX5 a fivefold coordination of the rare-earth atom is energetically more stable than a fourfold one, by again not more than about 0.3 eV; (iii) in M3RX6 the fivefold and sixfold coordinations of the rare-earth atom are energetically competitive; and (iv) in both M2RX5 and M3RX6 each coordination state can be realized in various forms that differ in detail but are close in energy. Bond fluctuations and disorder around the rare-earth atom can be expected to be a general feature at elevated temperatures, both in the vapour and in liquid rare-earth/alkali halide mixtures.

Magnetic ordering in the rare earth intermetallic compound Tb2Ti3Ge4: Magnetization and neutron diffraction studies

2009 ◽  
Vol 105 (7) ◽  
pp. 07A911 ◽  
Author(s):  
S. K. Malik ◽  
Jagat Lamsal ◽  
R. L. de Almeida ◽  
S. Quezado ◽  
W. B. Yelon ◽  
...  
Keyword(s):  
Rare Earth ◽  
Intermetallic Compound ◽  
Neutron Diffraction ◽  
Magnetic Ordering ◽  
Rare Earth Intermetallic ◽  
The Rare Earth

Structural study of the rare-earth transition-metal intermetallic compound Nd3Ni29Si4B10

1998 ◽  
Vol 278 (1-2) ◽  
pp. 239-245 ◽  
Author(s):  
Heng Zhang ◽  
E. Wu ◽  
S.J. Campbell ◽  
S.J. Kennedy ◽  
H.-S. Li ◽  
...  
Keyword(s):  
Rare Earth ◽  
Intermetallic Compound ◽  
Transition Metal ◽  
Structural Study ◽  
The Rare Earth
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