The effect of hydrophilic modification of expanded graphite on the thermophysical properties of magnesium chloride hexahydrate

2019 ◽  
Vol 140 (4) ◽  
pp. 1725-1735 ◽  
Author(s):  
Yecheng Qian ◽  
Yue Zhang ◽  
Jinhe Sun ◽  
Chao Song ◽  
Yan Jing ◽  
...  
Keyword(s):  
Thermophysical Properties ◽  
Magnesium Chloride ◽  
Expanded Graphite ◽  
Hydrophilic Modification ◽  
Magnesium Chloride Hexahydrate ◽  
Chloride Hexahydrate

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.

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