Abstract
Raman and infrared reflectance spectra of single-crystal lead tetraborate(PbB4O7:PTB) have been recorded. Using a first-principles calculation, the phonon dispersion relation ofPTB has been derived within the local density approximation. A symmetry analysis of thephonon modes at the centre of Brillouin zone was performed, and calculated frequencies arecompared to experimental spectra. A good agreement between calculated and measuredfrequencies was obtained.
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