Abstract
Raman spectra of small single crystals of both the trigonal and tetragonal forms of germanium dioxide have been obtained. Frequencies and symmetries of the Raman-active optical phonons are given, and comparison is made with isomorphic α quartz and rutile. The temperature dependences of the spectra have been examined over the range 6-1100°K. The static dielectric constant and infrared reflectivity of the trigonal form have been calculated from the Raman data.

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