Raman tensor analysis of sapphire single crystal and its application to define crystallographic orientation in polycrystalline alumina

Munisso, Maria Chiara; Zhu, Wenliang; Pezzotti, Giuseppe

doi:10.1002/pssb.200945137

Cited by 62 publications

(52 citation statements)

References 22 publications

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“…The lines corresponding to vibrations of different symmetry should manifest at different polarizations of incident and scattered radiation. [37][38][39][40][41][42][43][44][45] A clear angular dependence of the Raman signal (Fig. 7) was observed for single crystals of The angular dependence confirms the directional character of low frequency vibrations, whereas in the c direction no signal is observed, and the signal is most intense perpendicular to c.…”

mentioning

confidence: 84%

Raman spectroscopy studies of the terahertz vibrational modes of a DUT-8 (Ni) metal–organic framework

Крылов

Vtyurin

Petkov

et al. 2017

Phys. Chem. Chem. Phys.

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Low-frequency lattice vibrational modes have been discussed to play a crucial role in the phase transformation process of flexible metal-organic frameworks (MOFs). Therefore, Raman spectroscopy was applied to study the lattice dynamics of a pillared layer Moreover, the directional character of low-frequency vibrations in the flexible version of could be visualized by the orientation dependent Raman spectroscopy experiment.

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mentioning

confidence: 84%

Raman spectroscopy studies of the terahertz vibrational modes of a DUT-8 (Ni) metal–organic framework

Крылов

Vtyurin

Petkov

et al. 2017

Phys. Chem. Chem. Phys.

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“…The extracted mode intensities as a function of polarization angle are modeled using the Raman tensors for the C 3v point group (i.e., the trigonal symmetry of the lattice). The Raman intensity as a function of polarization angle can be calculated using the equation 20,29 …”

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confidence: 99%

Raman study of the phonon symmetries in BiFeO3single crystals

Beekman

Reijnders

et al. 2012

Phys. Rev. B

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In bismuth ferrite (BiFeO 3 ), antiferromagnetic and ferroelectric order coexist at room temperature, making it of particular interest for studying magnetoelectric coupling. The mutual control of magnetic and electric properties is very useful for a wide variety of applications. This has led to an enormous amount of research into the properties of BiFeO 3 . Nonetheless, one of the most fundamental aspects of this material, namely the symmetries of the lattice vibrations, remains controversial. We present a comprehensive Raman study of BiFeO 3 single crystals with the approach of monitoring the Raman spectra while rotating the polarization direction of the excitation laser. Our method results in unambiguous assignment of the phonon symmetries and explains the origin of the controversy in the literature. Furthermore, it provides access to the Raman tensor elements enabling direct comparison with theoretical calculations. Hence, this allows the study of symmetry breaking and coupling mechanisms in a wide range of complex materials and may lead to a noninvasive, all-optical method to determine the orientation and magnitude of the ferroelectric polarization. Multiferroic BiFeO 3 (BFO) is one of the few materials that simultaneously exhibits a robust magnetic ordering and large spontaneous ferroelectric polarization at room temperature, 1 making it of particular interest for studying magnetoelectric coupling.2-4 The mutual control of magnetic and electric properties is of great interest for applications in spintronics and magnetic storage media.5 This has triggered significant interest in BFO, resulting in numerous studies including optical 6,7 and Raman spectroscopy, 8-10 theoretical calculations, 11,12 thin-film devices, 1,13 and electrical control of magnetic excitations.14-18 Among these various techniques, the Raman spectrum of BFO is one of the most widely studied as it is a powerful tool to investigate phonons, magnons, and their interaction (i.e., electromagnons). [16][17][18][19] Moreover, proper phonon mode assignment is necessary to describe the phonons critical for the multiferroic behavior. However, even for measurements taken along the high-symmetry directions of single crystals, controversy in the symmetry assignments of the phonon modes remains. The discrepancies have previously been ascribed to violation of Raman selection rules due to variations in strain fields 9 (i.e., multidomain states) caused by polishing of the crystal surface. Once the symmetries are unambiguously assigned, deviations in phonon mode behaviors could be used to detect the presence of symmetry breaking, multidomain states, and phonon-magnon interactions. Furthermore, simply determining the mode symmetry only allows for a qualitative comparison with theoretical calculations, whereas a quantitative comparison is enabled by measuring the Raman tensor elements.To this end we have performed a comprehensive set of polarized micro-Raman spectroscopic studies of BFO single crystals with uniform ferroelectric polarization. Careful examina...

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“…Hopkins and Farrow have determined the local crystallographic orientations of laser-recrystallized polycrystalline silicon in silicon-on-insulator (SOI) structures using polarized Raman spectroscopy [12]. Munisso et al also employed this method to determine the crystallographic orientation of polycrystalline alumina [13]. The Euler angles of multicrystalline silicon have been determined by Becker et al with Raman spectroscopy during the stress measurement, though this method involves complicated formulas and tedious calculations [14].…”

Section: Introductionmentioning

confidence: 99%

Measurement of the Euler Angles of Wurtzitic ZnO by Raman Spectroscopy

Liu

Qiu

Jin

et al. 2017

Journal of Spectroscopy

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A Raman spectroscopy-based step-by-step measuring method of Euler angles φ, θ, and ψ was presented for the wurtzitic crystal orientation on a microscopic scale. Based on the polarization selection rule and coordinate transformation theory, a series of analytic expressions for the Euler angle measurement using Raman spectroscopy were derived. Specific experimental measurement processes were presented, and the measurement of Raman tensor elements and Euler angles of the ZnO crystal were implemented. It is deduced that there is a trigonometric functional relationship between the intensity of each Raman bands of wurtzite crystal and Euler angle ψ, the polarization direction of incident light under different polarization configurations, which can be used to measure the Euler angles. The experimental results show that the proposed method can realize the measurement of Euler angles for wurtzite crystal effectively.

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Raman tensor analysis of sapphire single crystal and its application to define crystallographic orientation in polycrystalline alumina

Cited by 62 publications

References 22 publications

Raman spectroscopy studies of the terahertz vibrational modes of a DUT-8 (Ni) metal–organic framework

Raman spectroscopy studies of the terahertz vibrational modes of a DUT-8 (Ni) metal–organic framework

Raman study of the phonon symmetries in BiFeO3single crystals

Measurement of the Euler Angles of Wurtzitic ZnO by Raman Spectroscopy

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