Article

Pressure induced phase transitions in hydroquinone.

Synchrotron Radiation Section, Bhabha Atomic Research Center, Mumbai-400085, India.
The Journal of Chemical Physics (impact factor: 3.33). 11/2004; 121(15):7320-5. DOI:10.1063/1.1792553 pp.7320-5
Source: PubMed

ABSTRACT High pressure behavior of alpha-hydroquinone (1,4-dihydroxybenzene) has been studied using Raman spectroscopy up to pressures of 19 GPa. Evolution of Raman spectra suggests two transitions around 3.3 and 12.0 GPa. The first transition appears to be associated with the lowering of crystal symmetry. Above 12.0 GPa, Raman bands in the internal modes region exhibit continuous broadening suggesting that the system is progressively evolving into a disordered state. This disorder is understood as arising due to distortion of the hydrogen-bonded cage across the second transition around 12 GPa.

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Keywords

disordered state
 
first transition
 
hydrogen-bonded cage
 
internal modes region exhibit continuous
 
pressure behavior
 
pressures
 
Raman bands
 
second transition
 
transitions