Magnetic Structure of Manganese Pyrophosphate and Copper Pyrophosphate

1972 ◽  
Vol 50 (24) ◽  
pp. 3079-3084 ◽  
Author(s):  
J. A. R. Stiles ◽  
C. V. Stager
Keyword(s):  
Phase Transition ◽  
Neutron Diffraction ◽  
Single Crystal ◽  
Magnetic Structure ◽  
Magnetic Structures

The magnetic structures of antiferromagnetic manganese pyrophosphate and copper pyrophosphate have been determined by single crystal neutron diffraction techniques. There have been two previous determinations of the structure of manganese pyrophosphate. The discrepancy between these results is explained by postulating a crystallographic phase transition.

Magnetic Structure Determination of CeT2Al10 (T = Ru and Os): Single Crystal Neutron Diffraction Studies

2011 ◽  
Vol 80 (7) ◽  
pp. 073701 ◽  
Author(s):  
Harukazu Kato ◽  
Riki Kobayashi ◽  
Tomoaki Takesaka ◽  
Takashi Nishioka ◽  
Masahiro Matsumura ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Single Crystal ◽  
Magnetic Structure ◽  
Structure Determination

Strukturen cäsiumhaltiger Fluoride, II1 Die Kristall- und Magnetische Struktur von CsFeF4 / Crystal and Magnetic Structure of CsFeF4

1974 ◽  
Vol 29 (3-4) ◽  
pp. 139-148 ◽  
Author(s):  
D. Babel ◽  
F. Wall ◽  
G. Heger
Keyword(s):  
Neutron Diffraction ◽  
Single Crystals ◽  
Magnetic Structure ◽  
Structure Determination ◽  
Mean Value ◽  
X Ray ◽  
Magnetic Structures ◽  
Powder Samples ◽  
Crystal And Magnetic Structure ◽  
Improved Model

The results of an X-ray structure determination on single crystals of CsFeF4 are reported. The compound crystallizes tetragonally with α = 7.794, c = 6.553 Å, z = 4, in spacegroup P4/nmm-D4h7 and is a hitherto unknown superstructure variant of the TlAlF4-type. Cesium exhibits 12-coordination (mean value Cs-F = 3.25 Å); the FeF6-octahedra are characteristically shortened normal to the FeF4⁻-layers (Fe-F = 1.962/1.861Å). An improved model is proposed and verified for a related structure of RbFeF4, showing the same features. Neutron diffraction studies on powder samples of CsFeF4 show that both compounds are identical as for their magnetic structures.

The magnetic structures of NdCu2 determined by single crystal neutron diffraction

1995 ◽  
Vol 96 (4) ◽  
pp. 491-496 ◽  
Author(s):  
M. Loewenhaupt ◽  
Th. Reif ◽  
R. R. Arons ◽  
E. Gratz ◽  
M. Rotter ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Single Crystal ◽  
Magnetic Structures

Dynamic proton disorder and the II–I structural phase transition in (NH4)3H(SO4)2

2009 ◽  
Vol 65 (1) ◽  
pp. 36-44 ◽  
Author(s):  
Yoo Jung Sohn ◽  
Anja Loose ◽  
Michael Merz ◽  
Karine Sparta ◽  
Helmut Klapper ◽  
...  
Keyword(s):  
Phase Transition ◽  
Neutron Diffraction ◽  
Single Crystal ◽  
Powder Diffraction ◽  
Structural Phase ◽  
Local Symmetry ◽  
Crystal Structure Analysis ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Proton Disorder

X-ray powder diffraction, differential scanning calorimetry (DSC)/thermogravimetry (TG) and single-crystal neutron diffraction methods were used to investigate triammonium hydrogen disulfate (NH4)3H(SO4)2 (TAHS) in the temperature range between 293 and 493 K. The temperature-dependent X-ray powder diffraction measurements show a clear hysteresis of the I \leftrightarrow II phase transition of TAHS with transition temperatures of T up = 412.9 (1) K on heating and of T down = 402.6 (1) K on cooling. From the existence of hysteresis and from the jump-like changes of the lattice parameters, the I \leftrightarrow II phase transition of TAHS is considered to be first order. With DSC/TG measurements we confirmed that there is only one phase transition between 293 and 493 K. Through careful investigation on single crystals of TAHS using neutron diffraction, the correct space group (C2/c) of room-temperature TAHS-II phase was confirmed. Crystal structure analysis by single-crystal neutron diffraction showed a strongly elongated displacement ellipsoid of the proton which lies in the middle of the (SO4)H(SO4) dimer with \bar 1 local symmetry. The protons of the NH4 groups also show strongly enlarged anisotropic mean-square displacements. These findings are interpreted in terms of a characteristic proton disorder in the TAHS-II phase.

Single-crystal neutron diffraction study of the structural phase transition in Ba0.95Ca0.05TiO3

1998 ◽  
Vol 10 (4) ◽  
pp. 899-899
Author(s):  
P U M Sastry ◽  
A Sequeira ◽  
H Rajagopal ◽  
B A Dasannacharya ◽  
S Balakumar ◽  
...  
Keyword(s):  
Phase Transition ◽  
Neutron Diffraction ◽  
Single Crystal ◽  
Diffraction Study ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Neutron Diffraction Study

Single-crystal neutron diffraction study of the structural phase transition in

1996 ◽  
Vol 8 (16) ◽  
pp. 2905-2913 ◽  
Author(s):  
P U M Sastry ◽  
A Sequeira ◽  
H Rajagopal ◽  
B A Dasannacharya ◽  
S Balakumar ◽  
...  
Keyword(s):  
Phase Transition ◽  
Neutron Diffraction ◽  
Single Crystal ◽  
Diffraction Study ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Neutron Diffraction Study
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