High-pressure Raman and x-ray diffraction studies on LaB6

X-ray diffraction measurements and Raman spectroscopy at room temperature document the equation of state and the frequency shifts for E-g, T-2g, and A(1g) vibrational modes of polycrystalline LaB6 under pressure. The data exhibit smooth pressure dependencies, yielding a zero-pressure isothermal bulk modulus K-0T=164(+/- 2) GPa in good accord with independent ultrasonic measurements, and show no evidence of structural or electronic phase transitions up to at least 25 GPa.