Vibrational Dynamics and Phase Transitions of Hydrazine to 50 GPa.

ABSTRACT: The high pressure behavior of hydrazine, N₂H₄, has been investigated to 50 GPa at room temperature using infrared and Raman spectroscopy to explore pressure induced phase transitions and changes in hydrogen bonding. Three solid-solid phase transitions were detected at 11, 21, and 32 GPa on room temperature compression through dramatic changes in the lattice vibration and N-H stretching regions with increasing pressure in both measurement techniques. The transition to phase IV, which appears at 32 GPa, exhibits increased hydrogen bonding with significant hysteresis, persisting to 9 GPa on decompression. This work presents a detailed analysis of the pressure dependence of mode shifts and calculations of mode Grüneisen parameters as well as a determination of an approxim

SUBMITTER: Ripani R 

PROVIDER: S-EPMC11886758 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature