Crystal structure of a high-pressure phase of magnesium chloride hexahydrate determined by in-situ X-ray and neutron diffraction methods

2019 ◽  
Vol 75 (12) ◽  
pp. 1605-1612 ◽  
Author(s):  
Keishiro Yamashita ◽  
Kazuki Komatsu ◽  
Takanori Hattori ◽  
Shinichi Machida ◽  
Hiroyuki Kagi
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Neutron Diffraction ◽  
Single Crystal ◽  
Magnesium Chloride ◽  
High Pressure Phase ◽  
X Ray ◽  
Magnesium Chloride Hexahydrate ◽  
Chloride Hexahydrate ◽  
Pressure Phase

A high-pressure phase of magnesium chloride hexahydrate (MgCl2·6H2O-II) and its deuterated counterpart (MgCl2·6D2O-II) have been identified for the first time by in-situ single-crystal X-ray and powder neutron diffraction. The crystal structure was analyzed by the Rietveld method for the neutron diffraction pattern based on the initial structure determined by single-crystal X-ray diffraction. This high-pressure phase has a similar framework to that in the known ambient-pressure phase, but exhibits some structural changes with symmetry reduction caused by a subtle modification in the hydrogen-bond network around the Mg(H2O)6 octahedra. These structural features reflect the strain in the high-pressure phases of MgCl2 hydrates.

A new high-pressure phase transition in clinoferrosilite: In situ single-crystal X-ray diffraction study

2017 ◽  
Vol 102 (3) ◽  
pp. 666-673 ◽  
Author(s):  
Anna Pakhomova ◽  
Leyla Ismailova ◽  
Elena Bykova ◽  
Maxim Bykov ◽  
Tiziana Boffa Ballaran ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Single Crystal ◽  
Diffraction Study ◽  
High Pressure Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressure Phase Transition ◽  
Pressure Phase

Crystalline structure of the TiO2 II high-pressure phase at 293, 223, and 133 K according to single-crystal x-ray diffraction data

2007 ◽  
Vol 52 (4) ◽  
pp. 195-199 ◽  
Author(s):  
S. K. Filatov ◽  
N. A. Bendeliani ◽  
B. Albert ◽  
J. Kopf ◽  
T. I. Dyuzheva ◽  
...  
Keyword(s):  
High Pressure ◽  
Single Crystal ◽  
Crystalline Structure ◽  
Diffraction Data ◽  
High Pressure Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pressure Phase

High-pressure Synthesis, Crystal Structure, and Properties of the First Ternary Zirconium Borate β-ZrB2O5

2008 ◽  
Vol 63 (6) ◽  
pp. 707-712 ◽  
Author(s):  
Johanna S. Knyrim ◽  
Hubert Huppertz
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Room Temperature ◽  
High Pressure Phase ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressure High Temperature ◽  
Pressure Synthesis ◽  
Pressure Phase

The high-pressure phase β -ZrB2O5 represents the first ternary borate in the system Zr-B-O. The compound was synthesized under high-pressure / high-temperature conditions of 7.5 GPa and 1100 °C in a Walker-type multianvil apparatus. The crystal structure was determined on the basis of single crystal X-ray diffraction data, collected at room temperature. The monoclinic zirconium borate crystallizes in the space group P21/c with the lattice parameters a = 439.04(9), b = 691.2(2), c = 896.8(2) pm, and β = 90.96(3)°. The structure is isotypic to the high-pressure phase β -HfB2O5, which is built up from layers of exclusively corner-sharing BO4 tetrahedra. Between these layers, the cations are coordinated square-antiprismatically by eight oxygen atoms.

High-Pressure Phase Diagram and Equation of State of Solid Helium from Single-Crystal X-Ray Diffraction to 23.3 GPa

1988 ◽  
Vol 60 (25) ◽  
pp. 2649-2652 ◽  
Author(s):  
H. K. Mao ◽  
R. J. Hemley ◽  
Y. Wu ◽  
A. P. Jephcoat ◽  
L. W. Finger ◽  
...  
Keyword(s):  
Phase Diagram ◽  
High Pressure ◽  
Equation Of State ◽  
Single Crystal ◽  
Solid Helium ◽  
High Pressure Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pressure Phase
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