Raman spectroscopy and phase stability of λ-N2. (April 2020)

• Record Type: Journal Article
• Authors: Liu, Shan; Pu, Meifang; Tang, Qiqi; Zhang, Feng; Wu, Binbin; Lei, Li
• Is Part Of: Solid state communications. Volume 310(2020)
• Publication Date: 2020-04
• Subjects: Molecular solid nitrogen -- High pressure -- Vibrational property -- Raman spectroscopy; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2020.113843
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: The λ -N2, a low-temperature, high-pressure (LTHP) molecular solid nitrogen, exhibits an exceptionally wide range of P - T stability. In this letter, six separate P - T paths are used to probe the formation condition and phase stability of the λ -N2, and the phase stability boundary has been reevaluated based on our Raman observations. The vibrational modes for λ -N2 have been studied by analyzing the local molecular properties, and a sudden broadening and turnover of vibron in Raman spectra at about 54 GPa has been observed. Highlights: The phase stability boundary for λ -N2 has been revised based on our Raman observations via six separate P - T paths. The vibrational modes for λ-N2 have been studied by analyzing the local molecular properties. We observed a sudden broadening and turnover of vibron in Raman spectra at about 54 GPa, which may indicate an isostructural phase transition.