Über des magnetische Verhalten von Cs2MYbF6 (M = Na, K, Rb) und Cs2NaYbBr6 / On the Magnetic Behaviour of Cs2MYbF6 (M = Na, K, Rb) and Cs2NaYbBr6

1979 ◽  
Vol 34 (12) ◽  
pp. 1507-1511
Author(s):  
Werner Urland
Keyword(s):  
Crystal Field ◽  
Ground State ◽  
Magnetic Behaviour ◽  
Magnetic Data ◽  
Temperature Range ◽  
Angular Overlap Model ◽  
The Individual ◽  
Overlap Model ◽  
Overlap Parameter

Abstract The magnetic behaviour of Cs2MYbF6 (M = Na, K, Rb) and Cs2NaYbBr6 has been studied in the temperature range between 3.5 and 251.3 K. The magnetic data are interpreted by means of a previously developed model in which the influence of the crystal field is theoretically described by the angular overlap model. The obtained values of the angular overlap parameter eσ(R) for the individual compounds are discussed and compared with each other. The energy values of the crystal-field levels of the 2F7/2 ground state are calculated.

Über das magnetische Verhalten von Cs2MHoF6 (M = Na, K, Rb)

1980 ◽  
Vol 35 (4) ◽  
pp. 403-407
Author(s):  
W. Urland
Keyword(s):  
Crystal Field ◽  
Ground State ◽  
Magnetic Behaviour ◽  
Magnetic Data ◽  
Temperature Range ◽  
Angular Overlap Model ◽  
Overlap Model

Abstract The magnetic behaviour of CS2MHoF6 (M = Na, K, Rb) has been studied in the temperature range between 3.2 and 251.3 K. The magnetic data are interpreted by means of a previously developed model in which the influence of the crystal field is theoretically described by the angular overlap model. Values of the angular overlap parameters eσ(R) and eπ(R) cannot be determined unequivocally. The energy values of the crystal-field levels of the 5I8 ground state are calculated.

Magnetische Eigenschaften der Normaltemperaturform von CsYbO2

1980 ◽  
Vol 35 (2) ◽  
pp. 247-251 ◽  
Author(s):  
Werner Urland
Keyword(s):  
Crystal Field ◽  
Ground State ◽  
Field Model ◽  
Magnetic Interaction ◽  
Magnetic Behaviour ◽  
Molecular Field ◽  
Magnetic Data ◽  
Temperature Range ◽  
Angular Overlap Model ◽  
Overlap Model

Abstract The magnetic behaviour of the normal-temperature form of CsYbO2 has been studied in the temperature range between 2.8 and 251.3 K. Besides at temperatures below about 12 K the magnetic data are well interpreted by means of a model in which the influence of the crystal field is theoretically described by the angular overlap model and the influence of magnetic interaction by the molecular field model. By this the transferability of the angular overlap parameters from one compound to another is tested. The energy values of the crystal-field levels of the 2F7/2 ground state are calculated.

Magnetische Eigenschaften der Normaltemperaturform von CsTmO2 / Magnetic Properties of the Normal-Temperature Form of CsTmO2

1979 ◽  
Vol 34 (8) ◽  
pp. 997-1002 ◽  
Author(s):  
Werner Urland
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Crystal Field ◽  
Ground State ◽  
Low Temperatures ◽  
Magnetic Behaviour ◽  
Magnetic Data ◽  
Angular Overlap Model ◽  
Temperature Form ◽  
Overlap Model

AbstractThe magnetic behaviour of the normal-temperature-form of CsTmO2 (NT-CsTmO2) has been studied in the temperature range between 2.9 and 251.3 K. In order to interpret the magnetic data a method applying the angular overlap model has been established to assess the crystal-field (CF) parameters of NT-CsTmO2 (CF symmetry: D3d) from the known CF parameters for Tm3+ substituted in YVO4 (CF symmetry: D2d)-With these CF parameters the observed magnetic properties of NT-CsTmO2 can be satisfactorily simulated. The calculation of the paramagnetic principal susceptibilities yields a high magnetic anisotropy, especially at low temperatures. The energy values of the CF levels of the 3H6 ground state are calculated.

scholarly journals Synthesis, Crystal Structure and Magnetic Behaviour of Dimeric and Polymeric Gadolinium Trifluoroacetate Complexes

2006 ◽  
Vol 61 (6) ◽  
pp. 699-707 ◽  
Author(s):  
Daniela John ◽  
Alexander Rohde ◽  
Werner Urland
Keyword(s):  
Crystal Structure ◽  
Magnetic Behaviour ◽  
Magnetic Data ◽  
Space Group ◽  
X Ray ◽  
Lattice Constants ◽  
Temperature Range ◽  
X Ray Crystallography ◽  
Carboxylate Groups

The gadolinium(III) trifluoroacetates ((CH3)2NH2)[Gd(CF3COO)4] (1), ((CH3)3NH)[Gd(CF3 COO)4(H2O)] (2), Gd(CF3COO)3(H2O)3 (3) as well as Gd2(CF3COO)6(H2O)2(phen)3 · C2H5OH (4) (phen = 1,10-phenanthroline) were synthesized and structurally characterized by X-ray crystallography. These compounds crystallize in the space group P1̅ (No. 2, Z = 2) (1, 2 and 4) and P 21/c (No. 14, Z = 4) (3), respectively, with the following lattice constants 1: a = 884.9(2), b = 1024.9(2), c = 1173.1(2) pm, α = 105.77(2), β = 99.51(2), γ = 107.93(2)°; 2: a = 965.1(1), b = 1028.6(1), c = 1271.3(2) pm, α = 111.83(2), β = 111.33(2), γ = 90.44(2)°; 3: a = 919.6(2), b = 1890.6(4), c = 978.7(2) pm, β = 113.94(2)°; 4: a = 1286.7(8), b = 1639.3(8), c = 1712.2(9) pm, α = 62.57(6), β = 84.13(5), γ = 68.28(5)°. The compounds consist of Gd3+ ions which are bridged by carboxylate groups either to chains (1 and 2) or to dimers (3 and 4). In addition to the Gd3+ dimers, compound (4) also contains monomeric Gd3+ units. The magnetic behaviour of 2 and 3 was investigated in a temperature range of 1.77 to 300 K. The magnetic data for these compounds indicate weak antiferromagnetic interactions

Symmetry-based equivalence between the crystal-field and angular-overlap models

1980 ◽  
Vol 33 (8) ◽  
pp. 1705 ◽  
Author(s):  
PJ Steenkamp ◽  
JW Gonsalves
Keyword(s):  
Crystal Field ◽  
Field Model ◽  
Unified Model ◽  
Ligand Field ◽  
Angular Overlap Model ◽  
Overlap Model ◽  
Ligand Field Parameters

Ratios between the cubic ligand-field parameters Δ, as predicted by the crystal-field model, are presented and compared with those obtained when utilizing the angular-overlap model. The remarkable similarities revealed are attributed to symmetry by introducing a symmetry- orientated reparameterization of the crystal-field model. A new parametric equivalence between the two models, based on the effects of symmetry, is established. Arguments suggesting a unified model are outlined.

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