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Real (upper curves) and imaginary (lower curves) of the optical dielectric constant of PST (bold lines) and PSN (thin lines) determined from optical ellipsometric measurements (Sentech Instuments); the band gap value is according to Ref. 12. The vertical lines indicate the light wavelengths used to excite the Raman scattering of PST and PSN.
Raman scattering of PST and PSN measured at different wavelengths of the incident light; for clarity the spectra of PST and PSN measured at are divided by factors of 7 and 15, respectively. The Raman scattering collected with is nearly the same as that collected with .
-excited Raman scattering of PST and PSN (bold lines). The band between 750 and , determined from the Raman-active stretching modes of octahedra, was fitted with two Lorentzian components (thin lines) accounting for the contribution from the paraelectric and ferroelectric nanodomains; the dashed lines represent the resulting spectrum profile. The ratio is equal to 0.28 and 0.12 for PST and PSN, respectively.
(Color online) Raman scattering excited with a laser wavelength of ; from top to bottom: PST, PSTN, PSTS, PSN, PSSN, and PLSN. For clarity, the spectrum of PLSN is vertically offset by .
Chemical composition, tolerance factors , and room-temperature unit cell parameters of the studied samples.
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