X-Ray Crystal Structure Analysis of Low Temperature Phase of SrTiO3

1979 ◽  
Vol 46 (2) ◽  
pp. 581-586 ◽  
Author(s):  
Hideshi Fujishita ◽  
Yōichi Shiozaki ◽  
Etsuro Sawaguchi
Keyword(s):  
Crystal Structure ◽  
Low Temperature ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Temperature Phase ◽  
X Ray ◽  
Low Temperature Phase

X-ray and neutron diffraction investigation at 298 K of NH4I · NH3 and ND4I · ND3 containing the cation H3N – H … NH3+ and D3N – D … ND3+

1992 ◽  
Vol 200 (3-4) ◽  
Author(s):  
H. J. Berthold ◽  
E. Vonholdt ◽  
R. Wartchow ◽  
T. Vogt
Keyword(s):  
Crystal Structure ◽  
Low Temperature ◽  
Neutron Diffraction ◽  
Single Crystal ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Single Crystal Structure ◽  
X Ray ◽  
Single Crystal Structure Analysis

AbstractNHA single crystal structure analysis of NThe deuterated compound NThe structures of the ordered low temperature phases will be reported separately.

Atomic and domain structure of the low-temperature phase of barium metagermanate (BaGeO3)

2006 ◽  
Vol 62 (6) ◽  
pp. 1002-1009 ◽  
Author(s):  
Daniel Maria Többens ◽  
Volker Kahlenberg ◽  
Christian Gspan ◽  
Gerald Kothleitner
Keyword(s):  
Crystal Structure ◽  
Low Temperature ◽  
Diffuse Scattering ◽  
Stacking Faults ◽  
Temperature Phase ◽  
Powder Diffraction Data ◽  
X Ray ◽  
Positional Disorder ◽  
Low Temperature Phase ◽  
Xrpd Pattern

The crystal structure of the low-temperature form of barium metagermanate (BaGeO3) has been determined from laboratory X-ray powder diffraction data collected at 298.5 (5) K. The structure was found to consist of alternating layers of Ba cations and [GeO3]3 rings, and is closely related to pseudo-wollastonite. The rings show a twofold positional disorder owing to stacking faults. The stacking is not random, but can be rationalized by a twinning mechanism mapping the two non-congruent enantiomorphic polytypes of the structure onto each other. This model also explains the diffuse scattering and twinning observed in SAED and HRTEM, as well as the size and strain-like broadening effects found in the XRPD pattern.

Structural phase transition and hydrogen ordering of TlH2PO4 at low temperature

2006 ◽  
Vol 62 (5) ◽  
pp. 719-728 ◽  
Author(s):  
I. H. Oh ◽  
M. Merz ◽  
S. Mattauch ◽  
G. Heger
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Low Temperature ◽  
Structural Phase ◽  
Crystal Structure Analysis ◽  
Temperature Phase ◽  
Structure Model ◽  
Triclinic Space Group ◽  
Space Groups ◽  
Low Temperature Phase

The crystal structure of TlH2PO4 (TDP) has been studied at low temperature. The lattice parameters were derived from high-resolution X-ray powder diffraction in the temperature range between 8 and 300 K. A detailed crystal structure analysis of the antiferroelectric low-temperature phase TDP-III has been performed based on neutron diffraction data measured at 210 K on a twinned crystal consisting of two domain states. The structure model in the triclinic space group P\bar 1 is characterized by a complete ordering of all the H atoms in the asymmetric O—H...O hydrogen bonds. The phase transition from the ferroelastic TDP-II to the antiferroelectric TDP-III phase at 229.5 ± 0.5 K is only slightly of first order and shows no detectable hysteresis effects. Its mechanism is driven by the hydrogen ordering between the partially ordered TDP-II state and the completely ordered TDP-III state. The polymorphism of TDP and the fully deuterated TlD2PO4 (DTDP) is presented in the form of group–subgroup relations between the different space groups.

scholarly journals Low-temperature x-ray crystal structure analysis of the cage-structured compounds MBe13(M=La,Sm,and U)

2018 ◽  
Vol 2 (5) ◽  
Author(s):  
Hiroyuki Hidaka ◽  
Ryoma Nagata ◽  
Chihiro Tabata ◽  
Yusei Shimizu ◽  
Naoyuki Miura ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Low Temperature ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
X Ray
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