Particularities of C60 transformations at 1.5 GPa

Article Abstract:

X-ray diffraction, infrared and Raman spectroscopies were used in studying the high-pressure states of C60 fullerene at 1.5GPa between the temperature range 293 to 1073 K. The C60 was sublimed twice in vacuum at 800 K inside 'Maxim' and 'toroid' devices to remove remaining solvent residues. The samples were then loaded at the required pressure at room temperature and heated at the given temperature. Results indicated that there is a change in the nature of the polymerization products when the treatment temperature of C60 is increased at quasihydrostatic pressure.

Carbon allotropes, Chemical systems

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Two martensitic transitions in the opposite directions in pentadecanoic acid

Article Abstract:

Solid-state phase transitions of pentadecanoic acid were investigated using microscopic observation and micro-Fourier transform infrared spectroscopy. Two martensitic transitions were found in the opposite directions in pentadecanoic acid, between which the starting and resulting polymorphs interchange. The martensitic transitions were induced by a mechanical stress and are dependent on temperature. In addition, the product phases grow in a definite direction and are highly oriented.

Fatty acids, Martensitic transformations

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Simulations of spontaneous phase transitions in large, deeply supercooled clusters of SeF(sub)6

Article Abstract:

Phase transition analysis of liquid clusters of varying molecular sizes examined at 140 K and 130 K reveals that nucleation always occurs at or near cluster surfaces. Data also indicate that monatomic clusters behave in a similar fashion.

United States, Statistical Data Included, Analysis, Supercooled liquids, Nucleation, Nucleation (Chemistry)

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