The high pressure structural behavior of H2 and Ne clathrate hydrates with approximate composition H2/Ne·~4H2O featuring cubic structure II (CS-II) was investigated by neutron powder diffraction using the deuterated analogues at ~95 K. CS-II hydrogen hydrate transforms gradually to isocompositional C1 phase (filled ice II) around 1.1 GPa but may be metastably retained up 2.2 GPa. Above 3 a grad...

The applications of clathrate hydrates on carbon dioxide capture and desalination is an attractive growing subject within the hydrate community. While many promoters exists to overcome numerous issues hydrate-based technologies (mostly how mild operating conditions improve kinetics), there a need find guest that could be recovered easily. That why cyclopentane (CP), organic molecule not miscibl...

Clathrate hydrates are ice-like, crystalline solids, composed of a three-dimensional network hydrogen bonded water molecules that confines gas in well-defined cavities can store gases as solid solution. Ideally, with maximum theoretical capacity about 5.4 wt%. However, the pressures necessary for formation such hydrate 180–220 MPa and therefore too high large-scale plants industrial use. Thus, ...

Earth abundant element clathrate phases are of interest for a number of applications ranging from photovoltaics to thermoelectrics. Silicon-containing type I clathrate is a framework structure with the stoichiometry A8-xSi46 (A = guest atom such as alkali metal) that can be tuned by alloying and doping with other elements. The type I clathrate framework can be described as being composed of two...

Order-disorder-order phase transitions in the clathrate-I Ba8Cu16P30 were induced and controlled by aliovalent substitutions of Zn into the framework. Unaltered Ba8Cu16P30 crystallizes in an ordered orthorhombic (Pbcn) clathrate-I superstructure that maintains complete segregation of metal and phosphorus atoms over 23 different crystallographic positions in the clathrate framework. The driving ...

A new 122-type phase, monoclinic BaIr₂Ge₂ is successfully synthesized by arc melting; X-ray diffraction and scanning electron microscopy are used to purify the phase and determine its crystal structure. BaIr₂Ge₂ adopts a clathrate-like channel framework structure of the monoclinic BaRh₂Si₂-type, with space group P2₁/c. Structural comparisons of clathrate, ThCr₂Si₂, CaBe₂Ge₂, and BaRh₂Si2 struct...

The present work investigates equilibrium conditions and dissociation enthalpy of hydrates formed from CO2-TBAB(tetra-n-butylammonium bromide)-water mixtures. Differential Thermal Analysis (DTA) was used for Hydrate-Liquid-Vapour (H-L-V) equilibrium condition determination in a TBAB concentration range from 4.43 to 9.01 wt% and in a CO2 pressure range from 0.3 to 2.5 MPa. The results showed tha...