Metastable structural transformations and pressure-induced amorphization in natural (Mg,Fe)2SiO4olivine under static compression: A Raman spectroscopic study

Pressure-induced transformations in diborane: a Raman spectroscopic study.

As a classical electron-deficient molecule with unique hydrogen bridge bonding, diborane has created considerable interest in the structural chemistry. We report here the first evidence of pressure-induced structural transformations of diborane probed by in situ Raman spectroscopy. At pressures around 4 GPa, diborane undergoes a liquid-solid phase transformation to a new high-pressure phase I w...

Pressure-induced polymerization of acrylic acid: a Raman spectroscopic study.

We report here the first in-situ Raman spectroscopic study of pressure-induced structural and polymeric transformations of acrylic acid. Two crystalline phases (I and II) were observed upon compression to approximately 0.3 and approximately 2.7 GPa. Phase I can be characterized with a single s-cis molecular conformation with possibly a similar structure to the low-temperature phase, while phase...

Pressure-induced structural evolution and amorphization in Eu3Ga5O12

Mechanical properties of natural radiation damaged titanite and 3 temperature induced structural reorganization : A Nanoindentation and 4 Raman spectroscopic study

21 This study provides new insights into the relation between thermally-induced 22 structural reorganization and the macroscopic mechanical properties of radiation-damaged 23 titanite. The natural sample contains ca. 30% amorphous fraction. Low temperature annealing 24 affects only slightly the sample stiffness and leads to a softening resulting from the defect 25 2 annihilation in crystalline ...

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,...