Study of the Kinetics of the Phase Transition of the First Order in Tetracosane C{sub 24}H{sub 50} by Fourier-Transform IR Spectroscopy

The kinetics of the development of the structural phase transition of the first order in monodisperse samples of tetracosane C{sub 24}H{sub 50} has been studied using Fourier-transform IR spectroscopy. Temperature dependences of frequencies and intensities of rocking (in the region of ν ~ 720 cm{sup...

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Bibliographic Details
Published in:Physics of the solid state 2019-10, Vol.61 (10)
Main Authors: Marikhin, V. A., Gur’eva, S. A., Myasnikova, L. P., Volchek, B. Z., Medvedeva, D. A.
Format: Article
Language:English
Subjects:
ALKANES
BENDING
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTALLOGRAPHY
FOURIER TRANSFORM SPECTROMETERS
INFRARED SPECTRA
KINETICS
LAMELLAE
METHYLENE RADICALS
OSCILLATION MODES
PHASE TRANSFORMATIONS
SOLIDS
SYMMETRY
TEMPERATURE DEPENDENCE
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Summary:The kinetics of the development of the structural phase transition of the first order in monodisperse samples of tetracosane C{sub 24}H{sub 50} has been studied using Fourier-transform IR spectroscopy. Temperature dependences of frequencies and intensities of rocking (in the region of ν ~ 720 cm{sup –1}) and bending (in the region of ν ~ 1470 cm{sup –1}) vibration modes of CH{sub 2} groups in trans methylene sequences in crystalline cores of elementary lamellae has been analyzed. It has been shown that the solid-phase transition of the first order develops by the heterogeneous mechanism in a narrow temperature interval ΔT ~ 2 K according to the theory of diffuse phase transitions of the first order and is caused by changes in the symmetry of crystallographic cells.
ISSN:1063-7834
1090-6460