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Raman spectra of poled polycrystalline PZT-PNN-PZN, collected in both (a) cross and (b) parallel . The vibrational modes are explicitly indicated as a collection of Gaussian/Lorentzian subbands. The symbol “∼” corresponds to an unknown band at .
(a) Angular dependence of for poled PZT-PNN-PZN. The individual functions and are reported in (b)— above and below. (c) Angular dependence of for poled PZT-PNN-PZN. The individual functions and are reported in (d)— above and below. The fitting is performed according to Eqs. (2) and (3) and the corresponding functions are listed in Table I.
Raman modes, Raman scattering tensors for PZT materials, and explicit expressions for their intensity dependence on the crystallographic orientation for and modes for various crystal structures.
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