Phase transformations in metastable liquids combined with polymerization

Ionic liquids: phase diagram characterisation with combined SAXS-WAXS

1-alkyl-3-methyl-imidazolium (Cn-mim) salts are examples of ionic liquids (ILs).[1] In these salts, the cation is a bulky organic molecule: accordingly, due to factors such as the hindered ion packing and low charge density, the melting point is relatively low compared with conventional inorganic salts. As a consequence, it is possible to synthesise ILs which are liquid at room temperature. The...

Metastable mantle phase transformations and deep earthquakes in subducting oceanic lithosphere

Earth's deepest earthquakes occur as a population in subducting or previously subducted lithosphere at depths ranging from about 325 to 690 km. This depth interval closely brackets the mantle transition zone, characterized by rapid seismic velocity increases resulting from the transformation of upper mantle minerals to higher-pressure phases. Deep earthquakes thus provide the primary direct evi...

Metastable high-pressure transformations of orthoferrosilite Fs82

High-pressure single-crystal X-ray diffraction experiments with natural ferrosilite Fs82 (Fe0.82Mg0.16Al0.01Ca0.01)(Si0.99Al0.01)O3 orthopyroxene (opx) reveal that at ambient temperature the sample does not transform to the clinopyroxene (cpx) structure, as reported earlier for a synthetic Fs100 end-member (Hugh-Jones et al., 1996), but instead undergoes a series of two polymorphic transitions,...

Waves in bubbly liquids with phase change

Phase transition in dimer liquids.

We study the phase transition in a system composed of dimers interacting with each other via a nearest-neighbor (NN) exchange J and competing interactions taken from a truncated dipolar coupling. Each dimer occupies a link between two nearest sites of a simple cubic lattice. We suppose that dimers are self-avoiding and can have only three orientations, which coincide with the x, y or z directio...