ChemInform Abstract: Crystallographic and Spectroscopic Investigations on Nine Metal-Rare-Earth Silicates with the Apatite Structure Type.

ChemInform ◽  
2015 ◽  
Vol 46 (20) ◽  
pp. no-no
Author(s):  
Maria Wierzbicka-Wieczorek ◽  
Martin Goeckeritz ◽  
Uwe Kolitsch ◽  
Christoph Lenz ◽  
Gerald Giester
Keyword(s):  
Rare Earth ◽  
Structure Type ◽  
Apatite Structure ◽  
Spectroscopic Investigations

Crystallographic and Spectroscopic Investigations on Nine Metal-Rare-Earth Silicates with the Apatite Structure Type

2015 ◽  
Vol 2015 (6) ◽  
pp. 948-963 ◽  
Author(s):  
Maria Wierzbicka-Wieczorek ◽  
Martin Göckeritz ◽  
Uwe Kolitsch ◽  
Christoph Lenz ◽  
Gerald Giester
Keyword(s):  
Rare Earth ◽  
Structure Type ◽  
Apatite Structure ◽  
Spectroscopic Investigations

scholarly journals High-Throughput Screening of Rare-Earth-Lean Intermetallic 1-13-X Compounds for Good Hard-Magnetic Properties

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1096 ◽  
Author(s):  
Georg Krugel ◽  
Wolfgang Körner ◽  
Daniel F. Urban ◽  
Oliver Gutfleisch ◽  
Christian Elsässer
Keyword(s):  
Rare Earth ◽  
High Throughput ◽  
High Throughput Screening ◽  
Spontaneous Magnetization ◽  
Anisotropy Field ◽  
Structure Type ◽  
Anisotropy Constant ◽  
Maximum Energy ◽  
Maximum Energy Product ◽  
Energy Product

By computational high-throughput screening, the spontaneous magnetization M s , uniaxial magnetocrystalline anisotropy constant K 1 , anisotropy field H a , and maximum energy product ( B H ) max are estimated for ferromagnetic intermetallic phases with a tetragonal 1-13-X structure related to the LaCo 9 Si 4 structure type. For SmFe 13 N, a ( B H ) max as high as that of Nd 2 Fe 14 B and a comparable K 1 are predicted. Further promising candidates of composition SmFe 12 AN with A = Co, Ni, Cu, Zn, Ga, Ti, V, Al, Si, or P are identified which potentially reach (BH) max values higher than 400 kJ/m 3 combined with significant K 1 values, while containing almost 50% less rare-earth atoms than Nd 2 Fe 14 B.

scholarly journals Rare-earth Metal Borosilicides R 9 Si15-x B3 (R = Tb, Yb): New Ordered Structures Derived from the AlB2 Structure Type

2020 ◽  
Vol 646 (14) ◽  
pp. 1168-1175
Author(s):  
Volodymyr Babizhetskyy ◽  
Volodymyr Levytskyi ◽  
Régis Jardin ◽  
Josef Bauer ◽  
Roland Guérin ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Structure Type ◽  
Ordered Structures

Vitusite — an apatite derivative structure

1992 ◽  
Vol 56 (383) ◽  
pp. 235-239 ◽  
Author(s):  
Adrian A. Finch ◽  
James G. Fletcher
Keyword(s):  
Rare Earth ◽  
Late Stage ◽  
Sensu Stricto ◽  
Hydrothermal Fluids ◽  
Stable Phase ◽  
Synthetic Analogue ◽  
Apatite Structure ◽  
Phosphate Mineral ◽  
Rare Earth Phosphate ◽  
Rare Earth Substitution

AbstractThe uncommon sodium rare-earth phosphate mineral vitusite-(Ce) (Na3RE(PO4)2) can be considered as the extreme product of sodium and rare-earth substitution in the apatite structure. Lesser amounts of substitution provide sodium and rare-earth-bearing apatites up to about 80 mol.% exchange; beyond this point vitusite is the stable phase. The structure of vitusite, determined previously from a synthetic analogue, can also be considered as a derivative from apatite, but with cations exchanged on sites normally occupied by anions. Vitusite can therefore be considered as a sodium- and rare-earthrich apatite end-member, with a distinct, but apatite-derived, structure, formed in highly persodic and high rare-earth environments. From an examination of the literature on diffusion in apatite, vitusite in principle could be formed from apatitesensu strictoby subsolidus diffusion in response to late-stage NaandRE-rich hydrothermal fluids.

ChemInform Abstract: Magnetism and Negative Magnetoresistance of Two Magnetically Ordering, Rare-Earth-Containing Zintl Phases with a New Structure Type: EuGa2Pn2(Pn: P, As).

ChemInform ◽  
2010 ◽  
Vol 41 (2) ◽  
Author(s):  
Andreas M. Goforth ◽  
Haakon Hope ◽  
Cathie L. Condron ◽  
Susan M. Kauzlarich ◽  
Newell Jensen ◽  
...  
Keyword(s):  
Rare Earth ◽  
Structure Type ◽  
Negative Magnetoresistance ◽  
Zintl Phases

Crystal chemistry of hydrothermally grown ternary alkali rare earth fluorides

2015 ◽  
Vol 71 (6) ◽  
pp. 768-776 ◽  
Author(s):  
Colin D. McMillen ◽  
Sara Comer ◽  
Kyle Fulle ◽  
Liurukara D. Sanjeewa ◽  
Joseph W. Kolis
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Single Crystals ◽  
Structural Information ◽  
Structure Type ◽  
Crystal Structure Analysis ◽  
Structural Variations ◽  
Ionic Radii ◽  
Wide Range ◽  
Potential Applications

The structural variations of several alkali metal rare earth fluoride single crystals are summarized. Two different stoichiometric formulations are considered, namely those of ARE2F7 and ARE3F10 (A = K, Rb, Cs; RE = Y, La–Lu), over a wide range of ionic radii of both the alkali and rare earth (RE) ions. Previously reported and several new single-crystal structures are considered. The new single crystals are grown using hydrothermal methods and the structures are compared with literature reports of structures grown from both melts and hydrothermal fluids. The data reported here are combined with the literature data to gain a greater understanding of structural subtleties surrounding these systems. The work underscores the importance of the size of the cations to the observed structure type and also introduces synthetic technique as a contributor to the same. New insights based on single-crystal structure analysis in the work introduce a new disordered structure type in the case of ARE2F7, and examine the trends and boundaries of the ARE3F10 stoichiometry. Such fundamental structural information is useful in understanding the potential applications of these compounds as optical materials.

New Quaternary Compounds R3MnAl3Ge2 (R - Rare Earth)

2019 ◽  
Vol 289 ◽  
pp. 21-27
Author(s):  
Natalia Semuso ◽  
Svitlana Pukas ◽  
Yaroslav O. Tokaychuk ◽  
Roman E. Gladyshevskii
Keyword(s):  
Rare Earth ◽  
Earth Metal ◽  
Structure Type ◽  
Hexagonal Structure ◽  
Cell Parameters ◽  
Arc Melting ◽  
Quaternary Compounds ◽  
Pearson Symbol ◽  
The Family ◽  
Trigonal Prismatic Coordination

Nine new quaternaryR3MnAl3Ge2alumogermanides (R= Sm, Gd-Lu) were synthesized by arc melting and their crystal structures were studied by X-ray powder diffraction. All of the compounds crystallize in hexagonal Y3NiAl3Ge2-type structures: Pearson symbolhP9, space groupP-62m. The unit-cell parameters of the isotypic compounds decrease with decreasing radius of the rare-earth metal. The hexagonal structure type Y3NiAl3Ge2(Z= 1) is a quaternary ordering variant of the binary type Fe2P (Z= 3) and the ternary types β1-K2UF6, Lu3CoGa5, Zr3Cu4Si2(Z= 1), ZrNiAl (Z= 3). It belongs to the family of structures with trigonal prismatic coordination of the small atoms.

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