Raman spectrum of Sr_0.61Ba_0.39Nb₂O₆

Abstract

Abstract The Raman spectra of a single crystal of strontium barium niobate were recorded in the temperature range–193 to 140°C. The configurations studied were X(ZZ)Y, X(YZ)Y, X(YX)Y, Z(XX)Y, Z(YZ)Y and Z(XZ)Y . The behavior of integrated reduced intensities, band widths and band centers with temperature indicated that the ferro‐electric transition temperature was near 65°C. The Raman data were not consistent with a classical Landau transition. Disorder‐induced first‐order spectra were observed and attributed to the disordered nature of the crystal Evidence was found for a possible phase transition near 120°C.