Raman studies of TGS doped with Nd

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• 作者：Mihaylova ; E.M. ; Byrne ; H.J.
• 关键词：C. Raman spectroscopy ; D. Ferroelectricity ; D. Crystal structure
• 刊名：Journal of Physics and Chemistry of Solids
• 出版年：2000
• 出版时间：December, 2000
• 年：2000
• 卷：61
• 期：1
• 页码：1919-1925
• 全文大小：663 K

文摘

Monocrystals of triglycine sulfate (TGS) doped with Nd, were studied by Raman spectroscopy. HeNe laser radiation (632.817nm) was used as the illumination source. The spectra were dispersed with a resolution of 1cm⁻¹/pixel. The observed lines were assigned to the vibrations of the characteristic groups and valence bonds in the investigated samples. Doping of TGS with Nd does not cause a change in the crystal structure and the symmetries of groups in the unit cell remain unaffected. A new mode at 1535cm⁻¹ appeared for all crystals doped with Nd, which indicates that Nd is coordinated with the glycine molecule. Doping with Nd affects significantly the C–CO bending mode at 584cm⁻¹, the O–C–O bending mode at 665cm⁻¹, the SO₄²⁻ mode at 1086cm⁻¹ and the CH₂ wagging and twisting mode at 1310cm⁻¹. The Raman bands at 1374 and 1413cm⁻¹ indicate the presence of a zwitterion, which supports Hoshino's theory for spontaneous polarization reversal in TGS.