Low-temperature and high-pressure structural behaviour of NaBi(MoO4)2—an X-ray diffraction study

2005 ◽  
Vol 178 (7) ◽  
pp. 2218-2224 ◽  
Author(s):  
A. Waśkowska ◽  
L. Gerward ◽  
J. Staun Olsen ◽  
M. Mączka ◽  
T. Lis ◽  
...  
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
Diffraction Study ◽  
X Ray Diffraction ◽  
Structural Behaviour ◽  
X Ray

scholarly journals The low-temperature and high-pressure crystal structures of cyclobutanol (C4H7OH)

2005 ◽  
Vol 61 (4) ◽  
pp. 449-454 ◽  
Author(s):  
Pamela A. McGregor ◽  
David R. Allan ◽  
Simon Parsons ◽  
Colin R. Pulham
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
Crystal Structures ◽  
X Ray Diffraction ◽  
Structural Behaviour ◽  
Coordination Environment ◽  
X Ray ◽  
Alkyl Groups ◽  
Graph Set ◽  
Packing Arrangement

The low-temperature and high-pressure crystal structures of cyclobutanol (C4H7OH) have been determined using single-crystal X-ray diffraction techniques. At temperatures below 220 K, cyclobutanol crystallizes in the Aba2 space group (Z′ =  2) and its crystal structure is composed of pseudo-threefold hydrogen-bonded molecular catemers [assigned as C_2^2(4) in graph-set notation], which lie parallel to the crystallographic a axis. At a pressure of 1.3 GPa, the crystal symmetry changes to Pna21 (Z′  =  1) and the molecular catemers [expressed as C(2) in graph-set notation] adopt a pseudo-twofold arrangement. This structural behaviour is in agreement with our previous observations for phenol and its halogenated derivatives 2-chlorophenol and 4-fluorophenol, where pressure was found to favour a molecular packing more closely associated with small alkyl groups rather than that of relatively bulky alkyl groups. In addition, an examination of the molecular coordination environment in the low-temperature and high-pressure structures of cyclobutanol reveals that the change in structure on application of pressure appears to be driven by the molecules assuming a packing arrangement which more closely resembles that adopted in hard-sphere structures.

Pressure Dependence of the Tetragonal-Orthorhombic Transition in La1.88 Sr0.12 Cu O4-δ: A Single Crystal X-Ray Study

1987 ◽  
Vol 99 ◽  
Author(s):  
R. Moret ◽  
G. Collin
Keyword(s):  
High Pressure ◽  
Transition Temperature ◽  
Low Temperature ◽  
Single Crystal ◽  
Diffraction Study ◽  
Pressure Dependence ◽  
Orthorhombic Phase ◽  
X Ray Diffraction ◽  
X Ray

ABSTRACTWe report the first combined high pressure (up to 30 kbar) and low temperature (10 K - 300 K) single crystal X-ray diffraction study of the tetra-gonal-orthorhombic transition in La2−xCuO4-δ(x=0.12). Superstructure reflections of the orthorhombic phase were used to characterize the transition. The transition temperature, TT–O, is found to decrease under pressure and the orthorhombic phase is suppressed above about 15 kbar. These results confirm that both phases are superconducting and suggest to attribute a previously reported kink in dTc/dP to different rates of increase of Tc for the tetragonal and orthorhombic phases.

Micro X-Ray Diffraction Study of Polycrystalline MgB 2 Wire and Evaluation of Carbon Doping Effect Via Low-Temperature Sintering

2019 ◽  
Author(s):  
Minoru Maeda ◽  
Dipak Patel, Dr. ◽  
Hiroaki Kumakura, Dr. ◽  
Gen Nishijima, Dr. ◽  
Akiyoshi Matsumoto, Dr. ◽  
...  
Keyword(s):  
Low Temperature ◽  
Diffraction Study ◽  
Carbon Doping ◽  
Doping Effect ◽  
Low Temperature Sintering ◽  
X Ray Diffraction ◽  
X Ray

Low-compressibility of tungsten tetraboride: a high pressure X-ray diffraction study

2011 ◽  
Vol 31 (2) ◽  
pp. 275-282 ◽  
Author(s):  
Chenji Liu ◽  
Fang Peng ◽  
Ning Tan ◽  
Jing Liu ◽  
Fengjiao Li ◽  
...  
Keyword(s):  
High Pressure ◽  
Diffraction Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tungsten Tetraboride
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