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- W2090935504 abstract "We present room-temperature Raman investigations of the nitrogen molecule stretching vibration in ${mathrm{Ar}}_{1mathrm{ensuremath{-}}mathit{x}}$(${mathrm{N}}_{2}$${)}_{mathit{x}}$ from x=1 to x=0.59 in the pressure range 1ensuremath{le}pensuremath{le}31 GPa. Ar substitution leads to an inhomogeneous broadening of the vibrational signal. The ensuremath{beta}-ensuremath{delta} phase transition of pure ${mathrm{N}}_{2}$ is shifted to higher pressures for x=0.75. The substituted Ar atoms preferentially occupy the 2a sites of the cubic elementary cell of the orientationally disordered ensuremath{delta} phase. This interpretation of the experimental data is supported by our model calculations. For x=0.75 a superstructure forms in which all the a sites are occupied by Ar atoms. No direct experimental evidence is found for a disorder-order ensuremath{delta}-ensuremath{epsilon} phase transition observable in pure ${mathrm{N}}_{2}$. However, calculated orientational potential energy barriers propose freezing of the orientational dynamics at reduced pressures. textcopyright{} 1996 The American Physical Society." @default.
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- W2090935504 title "High-pressure Raman study of theN2stretching vibration in argon-nitrogen mixtures at room temperature" @default.
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- W2090935504 doi "https://doi.org/10.1103/physrevb.54.913" @default.
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