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- W1985630131 abstract "Abstract In recent Raman scattering experiments we have investigated the ferroelectric phase transition in lead germanate (5 PbO. 3 GeO2). We observe a highly temperature dependent mode whose frequency decreases as the transition at Tc = 451 K is approached. The quasi-harmonic description yields a damping constant, γ, which diverges at Tc and a temperature dependent frequency, ω0 2, which departs from the predicted linear behavior. However, we have obtained an excellent correspondence of the observed lineshape with the modified response function which includes anharmonic coupling between dielectric fluctuations and fluctuations in the phonon density. Cowley et al.3 have indicated that this additional contribution is important in the low frequency response of long wavelength phonons in piezoelectric materials. The values of γ and ω0 2 obtained exhibit a linear temperature dependence and whle we find α and τ to be highly correlated, we estimate αT = 350±50 cm−1 with 2 cm−1 < τ−1 < 4 cm−1" @default.
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- W1985630131 date "1974-01-01" @default.
- W1985630131 modified "2023-10-18" @default.
- W1985630131 title "The ferroelectric mode in lead germanate" @default.
- W1985630131 cites W2081258757 @default.
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- W1985630131 doi "https://doi.org/10.1080/00150197408238024" @default.
- W1985630131 hasPublicationYear "1974" @default.
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