Structural phase transitions and hydrogen bonding in Rb3H(SO4)2

Hydrogen adsorption and phase transitions in fullerite

Hydrogen desorption and adsorption properties of the fullerene materials C60 , C70, and fullerite ~a mixture of C60 and C70) were measured volumetrically using a Sievert’s apparatus. Over several cycles of isotherm measurements at 77 K, the hydrogen storage capacities of one of the fullerite samples increased from an initial value of 0.4 wt % for the first cycle to a capacity of 4.4 wt % for th...

Structural phase transitions

Structural phase transitions can be studied by a variety of techniques; macroscopic fields, X-ray, light and neutron diffraction, and resonance methods. The information which can be obtained by these different techniques about the order parameter and susceptibility at structural phase transitions is described and compared. Landau theory coupled with the 'sot~ mode' concept provides a simple pic...

Cooperative hydrogen bonding and structural instability in water

2014 We propose a model for liquid water in which the bonding states of each molecule are represented by a 5-level equivalent system. The structural effects are taken into account in a theoretical approach of the « meanfield » type, the mean-field (internal pressure) being supposed to decrease when the number of 4-bonded molecules increases. The model predicts the dependence of several thermody...

Conventional and Unconventional Intramolecular Hydrogen Bonding in some Beta-diketones

This study presents our view of unconventional and conventional intramolecular hydrogen bonds (HBs) for some beta-diketones theoretically and experimentally. According to our results, the groups such as Phenyl and t-But in beta positions increase and CF3 group decrease IHB strength, respectively. For better understanding of the substitution effects, the compounds with similar and different subs...

Structural Phase Transitions in Ag2Se (Naumannite)