[N(CH{sub 3}){sub 3}H]{sub 2}ZnCl{sub 4}: Ferroelectric properties and characterization of phase transitions by Raman spectroscopy

Journal Article · Sun Dec 07 04:00:00 EST 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4903303· OSTI ID:22402729

Karoui, K.; Guidara, K.; Ben Rhaiem, A. ^[1]; Bulou, A.; Tabellout, M. ^[2]

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1. Laboratory of Condensed Matter, Faculty of Sciences, University of Sfax, BP1171, 3018 Sfax (Tunisia)
2. Institut des Molécules et Matériaux du Mans(IMMM), LUNAM Université, Université du Maine, CNRS UMR 6283, Avenue Olivier Messiaen, F-72085, Le Mans Cedex 09 (France)

The X-ray powder diffraction pattern shows that at room temperature, [N(CH{sub 3}){sub 3}H]{sub 2}ZnCl{sub 4} is crystallized in the orthorhombic system with Pnma space group. The phase transitions at T{sub 1} = 255 K, T{sub 2} = 282 K, T{sub 3} = 302 K, T{sub 4} = 320 K, and T{sub 5} = 346 K have been confirmed by the differential scanning calorimetry. The electrical technique was measured in the 10{sup −1}–10{sup 7 }Hz frequency range and 233–363 K temperature intervals. The temperature dependence of the dielectric constant at different temperatures proved that this compound is ferroelectric below 282 K. Besides, [N(CH{sub 3}){sub 3 }H]{sub 2}ZnCl{sub 4} shows classical ferroelectric behaviour near curie temperature. In order to characterize the phase transitions, Raman spectra have been recorded in the temperature range of 233–383 K and the frequency range related to the internal and external vibrations of the cations and anions (90–4000 cm{sup −1}). The temperature dependence of the Raman line shifts ν and the half-width Δν detects all phase transitions and confirms their nature, especially at 282 K that corresponds to the ferroelectric-paraelectric phase transition.

• OSTI ID: 22402729
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 21 Vol. 116; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANIONS
CALORIMETRY
CATIONS
CURIE POINT
FERROELECTRIC MATERIALS
ORTHORHOMBIC LATTICES
PERMITTIVITY
PHASE TRANSFORMATIONS
RAMAN SPECTRA
RAMAN SPECTROSCOPY
SPACE GROUPS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
WIDTH
X-RAY DIFFRACTION