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A Raman scattering spectroscopy study is reported through all four phases ofa (K0.5Na0.5)NbO3 crystal and ((K0.5Na0.5)1-xLix)NbO3 for x=0.02 and 0.03. Thetransitions among the ferroelectric phases in the Li-free crystal arehomogeneous and strongly hysteretic, with no evidence of a mixed-phase regionbetween the rhombohedral and orthorhombic phases. The Raman pattern in thelowest-temperature phase in the Li-doped material differs significantly fromthat found for x=0 and suggest a structural phase boundary exists at for a Liconcentration of less than 2%.

Raman spectroscopy of (K,Na)NbO3 and ((K,Na)1-xLix)NbO3