2017
DOI: 10.1016/j.jallcom.2016.12.166
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Raman spectra of (K, Na)(Nb, Ta)O3 single crystal

Abstract: The Raman scattering spectra for lead-free piezoelectric single crystal (K,Na)(Nb,Ta)O 3 (KNNT) were intensively investigated to explore its crystallographic structure. For the [011] C oriented sample, 12 Raman peaks were identified from the room temperature Raman spectrum. The υ 3 , υ 4 and υ 6 modes which should be Raman silent in normal perovskites were observed due to the low symmetry (Pm) of KNNT single crystal. The temperature dependent Raman spectra indicated that the orthorhombictetragonal phase transi… Show more

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Cited by 17 publications
(23 citation statements)
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“…In order to analyze the specific discrepancy of phonon modes with the pressure, we reveal in Figure 2c, d a Lorentzian-shape decomposition for four selected pressures (0, 1.68, 5.01, and 9.48 GPa for KNN-LN Generally, a perfect NbO 6 octahedron has six phonon vibrations: the symmetric stretching mode A 1g (ν 1 ), asymmetric stretching modes E g (ν 2 ) and F 1u (ν 3 ), asymmetric bending mode F 1u (ν 4 ), symmetric bending mode F 2g (ν 5 ), and the inactive mode F 2u (ν 6 ). 44,45 The ν 1 , ν 2 , and ν 5 modes have Raman scattering activity among these vibrations. The whole vibrational configuration can be regarded as the translational mode of basic ions and the rotational mode of the NbO 6 octahedron in the frequency range below 200 cm −1 .…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…In order to analyze the specific discrepancy of phonon modes with the pressure, we reveal in Figure 2c, d a Lorentzian-shape decomposition for four selected pressures (0, 1.68, 5.01, and 9.48 GPa for KNN-LN Generally, a perfect NbO 6 octahedron has six phonon vibrations: the symmetric stretching mode A 1g (ν 1 ), asymmetric stretching modes E g (ν 2 ) and F 1u (ν 3 ), asymmetric bending mode F 1u (ν 4 ), symmetric bending mode F 2g (ν 5 ), and the inactive mode F 2u (ν 6 ). 44,45 The ν 1 , ν 2 , and ν 5 modes have Raman scattering activity among these vibrations. The whole vibrational configuration can be regarded as the translational mode of basic ions and the rotational mode of the NbO 6 octahedron in the frequency range below 200 cm −1 .…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…Moreover, the peak at 424 cm −1 is caused by O–Nb–O bending vibration and Nb–O chain stretching vibration. The peak at 750 cm −1 is ascribed to the stretching vibration of the Nb–O bond 37–43 . Using the Lorentz fitting method, the effective phonon energy of the GC750 sample can be estimated from the following equation: Ephbadbreak=ixiwiAiiwiAi$$\begin{equation}{E_{ph}} = \frac{{\mathop \sum \nolimits_i {x_i}{w_i}{A_i}}}{{\mathop \sum \nolimits_i {w_i}{A_i}}}\;\;\end{equation}$$where w i is the half‐width, A i is the peak intensity, and x i is the peak position of the Lorentz‐fitted phonon band 44 .…”
Section: Resultsmentioning
confidence: 99%
“…The higher the value of the stability parameter, the better vibration of the Nb-O bond. [37][38][39][40][41][42][43] Using the Lorentz fitting method, the effective phonon energy of the GC750 sample can be estimated from the following equation:…”
Section: Structural Analysismentioning
confidence: 99%
“…The A 1 (1LO) mode at 172 cm −1 can be described as the vibration of the K + cations versus the NbO 6 /TaO 6 octahedral units. 24,25 The A 1 (2TO) mode at 199 cm −1 , which is related to the Fano resonance, 26 is where the niobium ions vibrate against the NbO 6 /TaO 6 octahedral units, as shown in Figure 1d. The B 1 +E(3TO) mode at 278 cm−1 (Figure 1f−g) is the wing- flapping vibration of the four oxygen atoms in the same plane.…”
Section: Resultsmentioning
confidence: 99%