Structure determinations of the low-temperature phases of the copper pyridine N-oxide complexes, Cu(C5H5NO)6X2 by neutron diffraction and EPR: influence of solvent and anion on the nature of the cooperative Jahn-Teller coupling

1982 ◽  
Vol 21 (12) ◽  
pp. 4275-4284 ◽  
Author(s):  
C. P. Keijzers ◽  
R. K. McMullan ◽  
J. S. Wood ◽  
G. Van Kalkeren ◽  
R. Srinivasan ◽  
...  
Keyword(s):  
Low Temperature ◽  
Neutron Diffraction ◽  
Structure Determinations ◽  
Jahn Teller ◽  
Influence Of Solvent

scholarly journals Über die Strukturen der CuZrF6-Modifikationen - Neutronenbeugungsuntersuchungen an den Kristallpulvern / A Neutron Diffraction Study on the Modifications of CuZrF6

1978 ◽  
Vol 33 (3) ◽  
pp. 268-274 ◽  
Author(s):  
V. Propach ◽  
F. Steffens
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Neutron Diffraction ◽  
Experimental Evidence ◽  
Neutron Diffraction Study ◽  
Three Dimensions ◽  
Space Group ◽  
Powder Samples ◽  
Jahn Teller ◽  
Jahn Teller Effect

Abstract The structures of two modifications of CuZrF6 by means of neutron diffraction on powder samples in the temperature range from 298-560 K are reported. All modifications consist of octahedra, which share corners in three dimensions and which are centered alternately by Cu2+ or Zr4+. The high temperature α-modification crystallizes in space group Fm3 (No. 202) with α = 7.939 Å. There is experimental evidence, that the CuFe-octahedra are distorted by a static Jahn-Teller-effect. The space group P1̄ (No. 2) with Z = 2 is proposed for the low-temperature γ-modification.

Magnetism of Alkalitetrafluoromanganates (III) AMnF4 (A = K, Rb, Cs): Neutron Diffraction, Mössbauer and Magnetization Investigations

1993 ◽  
Vol 48 (11) ◽  
pp. 1054-1072 ◽  
Author(s):  
Michel Molinier ◽  
Christoph Frommen ◽  
Werner Massa ◽  
Jürgen Pebler ◽  
Thierry Roisnel
Keyword(s):  
Neutron Diffraction ◽  
Magnetic Hyperfine Field ◽  
Thermal Excitation ◽  
Spin Orientation ◽  
Domain Wall Dynamics ◽  
Out Of Plane ◽  
Exponential Temperature Dependence ◽  
Jahn Teller ◽  
Magnetic Spin ◽  
Ordered Layers

Abstract The magnetic properties of the d4 Jahn-Teller systems AIMnIIIF4 with layered structures were investigated. Neutron diffraction on powders of KMnF4 and RbMnF4 revealed different antiferro-magnetic spin arrangements below TN = 4.5 K and 2.3 K, respectively: for KMnF4 canted antiparallel along a and b, for RbMnF4 parallel along a and antiparallel along b, in both cases parallel along c, the stacking direction of layers. Mössbauer investigations on 57Fe doped KMnF4 confirmed a spin orientation approximately within the layer plane. A discussion is given of the contributions to the magnetic hyperfine field and the Mössbauer linewidth in quasi-two-dimensional antiferromagnets with Ising anisotropy due to thermal excitation of domain wall dynamics (solitons). The experimental data seem to confirm the predicted exponential temperature dependence of the linewidth. From magnetization measurements on powders and a single crystal of KMnF4 the 2-d exchange energy and the out-of-plane and in-plane anisotropies could be extracted. In addition, from susceptibility measurements the exchange energies of NaMnF4 , RbMnF4 and CsMnF4 were calculated. A linear dependence of these exchange energies (positive for ferromagnetic CsMnF4 , negative for the other AMnF4 compounds) on the cos2 of the Mn-F-Mn bridge angle is observed and compared with the behaviour of the AFeF4 compounds which is also linear but with reverse sign of the slope. The specific superexchange mechanisms active in Jahn-Teller systems with antiferrodistortively ordered layers are suggested to be responsible for these findings.

Low temperature neutron diffraction data for CeCo0.86Ge2

2005 ◽  
Vol 387 (1-2) ◽  
pp. L8-L10 ◽  
Author(s):  
A. Gil ◽  
B. Penc ◽  
J. Hernandez-Velasco ◽  
E. Wawrzyńska ◽  
A. Szytuła
Keyword(s):  
Low Temperature ◽  
Neutron Diffraction ◽  
Diffraction Data ◽  
Neutron Diffraction Data

Low Temperature Neutron Diffraction Data for CeCo0.86Ge2.

ChemInform ◽  
2005 ◽  
Vol 36 (15) ◽  
Author(s):  
A. Gil ◽  
B. Penc ◽  
J. Hernandez-Velasco ◽  
E. Wawrzynska ◽  
A. Szytula
Keyword(s):  
Low Temperature ◽  
Neutron Diffraction ◽  
Diffraction Data ◽  
Neutron Diffraction Data
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