Structural phase transitions and Raman spectra of pyridinium perrhenate at high pressures

Кичанов, С. Е.; Козленко, Д. П.; Wąsicki, J.; Dubrovinsky, Leonid; Czarnecki, P.; Nawrocik, W.; Савенко, Б. Н.; Pogoreliy, D.K.; Подурец, К. М.

doi:10.1016/j.molstruc.2008.12.034

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…Figure a illustrates that Raman spectrum for MFe thin film in the range of 100–1,100 cm −1 and 2,800–3,100 cm −1 (inset) at room temperature. Raman modes are assigned by the available literatures . The spectra are analyzed mostly on the basis of vibrations of its components Hdabco + and ReO 4 − .…”

Section: Resultsmentioning

confidence: 99%

Raman evolution of order–disorder phase transition in multiaxial molecular ferroelectric thin film

Zafar

Guo

et al. 2019

J Raman Spectroscopy

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Multiaxial molecular ferroelectrics (MFe) attain great attention due to their number of equivalent ferroelectric axes, an essential characteristic for many applications of these polar polycrystalline materials. Here we report a systematic approach to reveal the temperature‐dependent Raman spectroscopic investigation of the vibrational properties of a [Hdabco]ReO4 (dabco = 1,4‐diazabicyclo[2.2.2]octane), a multiaxial MFe thin film. The Raman spectra allowed to obtain information relative to the change in molecular symmetry governed by the order–disorder phase transition. This phase transition is manifested by the temperature‐dependent peak shift, full width half maximum and intensity of distinct vibrational modes. The experimental observation reveals that ferroelectric phase transition is mainly driven by the reorientation motion of the ReO4− anions and monopronated dabco cations. Hence, we demonstrated that the Raman spectroscopy is a very useful tool to characterize the newly emerged MFe system.

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Section: Resultsmentioning

confidence: 99%

Raman evolution of order–disorder phase transition in multiaxial molecular ferroelectric thin film

Zafar

Guo

et al. 2019

J Raman Spectroscopy

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“…The bands at 1007 cm 1 and 930 cm 1 correspond, to symmetric and antisymmetric stretching vibrations of C C bonds respectively and characterize the orientation of the dipole moment of the dabco molecule. 25,26 The presence of a 1007 cm 1 line in the spectrum of nanofibers indicates that dabco molecules are mainly oriented in the plane of the mat, whereas its angular independence shows the deviation of molecules from the fiber's axis at a certain angle. An average value of this angle was found from analysis of intensity of several A 1 Raman bands including lines at 803 and 1007 cm 1 .…”

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confidence: 99%

Energy harvesting from nanofibers of hybrid organic ferroelectric dabcoHReO4

Isakov

Gomes

Almeida

et al. 2014

Applied Physics Letters

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We report excellent piezoelectric and pyroelectric properties of electrospun nanofibers based on the hybrid ferroelectric 1,4-diazabicyclo[2.2.2]octane perrhenate (dabcoHReO4). Ferroelectric nanoparticles are embedded into the fibers being naturally aligned with the major polarization component along the fiber axis. A flexible piezoelectric nanogenerator consisting of an aligned array of dabcoHReO4 fibers provides a voltage above 100 mV under a moderate strain level. The pyroelectric coefficient in as-electrospun dabcoHReO4 fiber mat is similar to that in poled polyvinylidene difluoride nanofibers. The results show that the nanofibers based on dabcoHReO4 have a great potential for pyroelectric and piezoelectric autonomous energy harvesting with natural advantages such as biocompatibility, flexibility, low cost, and easy fabrication.

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