Journal ArticleDOI
Persistence of tetragonal raman lines in cubic KNbO3
TLDR
In this article, the temperature dependence of the vibrationnal modes in KNbO 3 around the cubic-tetragonal phase transition is studied by Raman scattering measurements, and an unexpected intense spectrum is observed above the transition.About:
This article is published in Solid State Communications.The article was published on 1983-03-01. It has received 12 citations till now. The article focuses on the topics: Tetragonal crystal system & Raman spectroscopy.read more
Citations
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Journal ArticleDOI
Infrared spectroscopy in KNbO3 through the successive ferroelectric phase transitions
TL;DR: In this paper, the temperature dependence of the infrared reflectivity spectra in KNbO3 is reported for the cubic, tetragonal and orthorhombic phases in a temperature range extending from 300 to 1200K.
Journal ArticleDOI
Raman spectroscopy of (K,Na)NbO3 and (K,Na)1−xLixNbO3
H. J. Trodahl,Naama Klein,Dragan Damjanovic,Nava Setter,B. M. Ludbrook,Daniel Rytz,Martin Kuball +6 more
TL;DR: In this paper, the phase transitions in Li-free crystal are homogeneous and hysteretic, with no mixed-phase region between the rhombohedral and orthorhombic phases.
Journal ArticleDOI
Anomalous mode coupling and phase transition of KNbO3 under high pressure
M.Md Shamim,Takeo Ishidate +1 more
TL;DR: In this paper, the Raman spectra of KNbO 3 under high pressure have been analyzed on the basis of the two-mode coupling model, and it has been found that the phase transitions from orthorhombic to tetragonal and from Tetragonal to cubic occur at 7 and 8 GPa, respectively, accompanied by an abrupt jump of the mode width of one mode.
Journal ArticleDOI
Phase transitions and optical characterization of lead-free piezoelectric (K0.5Na0.5)0.96Li0.04(Nb0.8Ta0.2)O3 thin films
TL;DR: In this article, the phase transition of lead-free piezoelectric thin films was studied by Raman spectroscopy, and two distinct anomalies originating from the cubic-to-tetragonal (TC-T) and tetragonal-toorthorhombic (TT-O) phase transitions were observed.
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Preparation and Transport Properties of New Oxide Ion Conductors KNb1-xMgxO3-δ by High Temperature and Pressure
TL;DR: In this paper, a series of oxide ion conductors (KNb_(1-x)Mg_xO_(3-δ) (x = 0.05−0.30) were prepared at a temperature of 870 °C and a pressure of 4.0 GPa.
References
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Journal ArticleDOI
Crystal stability and the theory of ferroelectricity
TL;DR: In this article, it is shown that the parameters which determine the lattice vibrations of a diatomic ionic crystal may be chosen in such a way that the crystal will exhibit ferroelectric properties, and that anti-ferroelectric transitions may be regarded as the result of an instability of the crystal for a certain normal mode of vibration.
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Temperature dependence of the Raman cross section and light absorption in cubic BaTiO3
A.M. Quittet,M. Lambert +1 more
TL;DR: In this article, the temperature dependence of the Raman spectrum in the cubic phase of BaTiO 3 is described, and the cross section decreases when the temperature increases, which is contrary to a normal second order effect behaviour.
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Anomalous scattering and asymmetrical line shapes in Raman spectra of orthorhombic KNb O 3
TL;DR: In this article, the anomalous spectrum of the orthorhombic KNb${\mathrm{O}}_{3}$ is found to contain anomalous scattering, consisting of a large background and broad bands, which can be related directly to the dynamic disorder which has been invoked to explain the results of earlier studies of diffuse x-ray scattering and inelastic neutron scattering.
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Precursor order and Raman scattering near displacive phase transitions
A D Bruce,W Taylor,A F Murray +2 more
TL;DR: In this article, the authors reported detailed experimental studies of the onset of hardmode Raman activity near the cubic-tetragonal structural phase transitions in KMnF3 and RbCaF3.
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Optical modes and dielectric properties of ferroelectric orthorhombic KNbO 3
D. G. Bozinis,J. P. Hurrell +1 more
TL;DR: In this article, the opticmode spectrum of orthorhombic KNbO at room temperature was determined by using Raman scattering and infrared reflectivity measurements, and the spectral anisotropic properties of the optic modes were determined.