Abstract
Raman spectra of Sr2Nb2O7 have been successfully obtained at temperatures up to 1643 K for the first time, using a continuous-wave ultraviolet Raman spectroscopic system designed to measure the Raman scattering from materials at high temperature. The Raman spectra of Sr2Nb2O7 with a symmetry of Cmc21 are described in terms of the parameter related to temperature variation at constant pressure, defined in a similar way to the Gruneisen parameter. By means of comparing vibrational modes of Sr2Ta2O7, the higher frequency modes located above 210 cm-1 are assigned to NbO6 internal modes. The parameter of NbO6 internal modes is as large as that of lattice modes, reflecting the weak chemical-bond strength of Nb–O bonds.
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