Pressure induced phase transitions in hydroquinone

ArticleinThe Journal of Chemical Physics 121(15):7320-5 · November 2004with5 Reads
Impact Factor: 2.95 · DOI: 10.1063/1.1792553 · Source: PubMed


    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.