Ferroelectricity in RbLiSO<sub>4</sub>

Shiroishi, Y.; Nakata, Akinori; Sawada, Shozo

doi:10.1143/jpsj.40.911

Cited by 72 publications

(13 citation statements)

References 4 publications

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“…Phonons belonging to the A 1 representation are observed in the x zz y polarization setting whereas those belonging to the E representation are observed in the z xz x scattering geometry. It is agreed that the temperature-dependent phase transitions presented by KLiSO 4 (KLS), 10 RbLiSO 4 (RLS), 11 CsLiSO 4 (CLS) 12 and LiNH 4 SO 4 (LAS) 13 are characterized by modifications in the external (optical translatoryand rotatory-type) modes region and also in the internal modes of the SO 4 2 ions due to its reorientation about a given crystallographic axis. Careful analysis of the spectra displayed in Figs 3 and 4 shows that the external modes (ω Ä 400 cm 1 ), internal SO 4 2 and H 2 O modes 14 and the modes appearing in the wavenumber regions 500 < ω < 540 cm 1 and 750 < ω < 830 cm 1 do not exhibit quantitative variations either in wavenumber or intensity, or both, with temperature of the crystal, indicating that the C 6 3v phase of LNSW is stable in the temperature range investigated.…”

Section: Positions Of Atoms Of Lnsw In the Unit Cell (Distances In Nm)mentioning

confidence: 87%

X-ray and temperature polarized Raman spectroscopic characterization of the LiNa3(SO4)2·6H2O crystal

Mendes-Filho

Paiva

Freire

et al. 1999

J. Raman Spectrosc.

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Results of x-ray diffraction and polarized Raman studies of hexahydrated lithium sodium sulfate, LiNa 3 (SO 4 ) 2 Ð6H 2 O (LNSW), are reported. X-ray diffraction data show that at room temperature LNSW has a trigonal structure belonging to space group C 6 3v with six molecules per unit cell. Temperature-dependent first-order Raman light studies in the range 12-300 K were carried out in order to investigate the phonon spectra of LNSW in relation to the phase transition in the crystal. Complete spectra were obtained for geometries allowing the observation of A 1 and E species. Careful analysis of the spectra shows that the observed Raman modes do not exhibit variations in either wavenumber or intensity, or both, with temperature of the crystal, indicating that the C 6 3v phase at 300 K does not undergo a transition in the temperature range investigated. Data from Raman measurements taken at 12 K were used to propose an assignment of the fundamental modes on the basis of water group vibrations and correlations with previous data reported for other crystals belonging to the double sulfate family.

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Section: Positions Of Atoms Of Lnsw In the Unit Cell (Distances In Nm)mentioning

confidence: 87%

X-ray and temperature polarized Raman spectroscopic characterization of the LiNa3(SO4)2·6H2O crystal

Mendes-Filho

Paiva

Freire

et al. 1999

J. Raman Spectrosc.

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“…where g is the gyromagnetic ratio for the 1 The correlation time t H of 1 H for a thermally activated reorientation follows the usual Arrhenius expression [17,25] t H ¼ t o expðÀE a =k B TÞ ð 4Þ…”

Section: H and 7 LI Nmr For Lirb 1 à X (Nh 4 ) X So 4 (X¼1) Crystalmentioning

confidence: 99%

“…LiRbSO 4 undergoes successive phase transitions at 477 K ( ¼T C1 ), 475 K (¼ T C2 ), 458 K ( ¼T C3 ), and 439 K ( ¼T C4 ) [1,2]. The successive phases in order of decreasing temperature are referred to as I, II, III, IV, and V. Phases I and V are paraelectric [2].…”

Section: Introductionmentioning

confidence: 99%

Study on the structural properties and relaxation mechanisms in LiRb1−x(NH4)xSO4 (x=0, 0.5, and 1) mixed crystals by 1H, 7Li, and 87Rb nuclear magnetic resonance

Lim

2011

Solid State Nuclear Magnetic Resonance

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“…For example, rubidium lithium sulphate (RbLiSO 4 ) of ABXY 4 -type has been known as a ferroelectric substance which undergoes successive phase transitions [4,5]. The existence of several field induced phases has been also reported for this material.…”

Section: /[426]mentioning

confidence: 99%

DSC and X-Ray Studies on the Phase Transitions in (NH₄)₃Li(SO₄)₂

et al. 2009

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Triammonium lithium disulfate NH( 4 ) 3 Li(SO 4 ) 2 was crystallized by evaporating the aqueous solution at room temperature. The phase transition and the crystal structure at room temperature were investigated by means of differential scanning calorimetry (DSC) and single-crystal X-ray diffraction, respectively. As a result, thermal anomalies relating to phase transitions were observed at 221 K, 286 K and 458 K. At room temperature, NH( 4 ) 3 Li(SO 4 ) 2 belonged to the monoclinic space group P 2 1 (Z = 2) and had lattice constants of a = 8.78105(5)Å, b = 5.2823(2)Å, c = 9.1331(5)Å, β = 90.0782(9) • . The R factor converged to 0.0477.

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Ferroelectricity in RbLiSO₄

Cited by 72 publications

References 4 publications

X-ray and temperature polarized Raman spectroscopic characterization of the LiNa3(SO4)2·6H2O crystal

X-ray and temperature polarized Raman spectroscopic characterization of the LiNa3(SO4)2·6H2O crystal

Study on the structural properties and relaxation mechanisms in LiRb1−x(NH4)xSO4 (x=0, 0.5, and 1) mixed crystals by 1H, 7Li, and 87Rb nuclear magnetic resonance

DSC and X-Ray Studies on the Phase Transitions in (NH₄)₃Li(SO₄)₂

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Ferroelectricity in RbLiSO4

Cited by 72 publications

References 4 publications

X-ray and temperature polarized Raman spectroscopic characterization of the LiNa3(SO4)2·6H2O crystal

X-ray and temperature polarized Raman spectroscopic characterization of the LiNa3(SO4)2·6H2O crystal

Study on the structural properties and relaxation mechanisms in LiRb1−x(NH4)xSO4 (x=0, 0.5, and 1) mixed crystals by 1H, 7Li, and 87Rb nuclear magnetic resonance

DSC and X-Ray Studies on the Phase Transitions in (NH4)3Li(SO4)2

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Ferroelectricity in RbLiSO₄

DSC and X-Ray Studies on the Phase Transitions in (NH₄)₃Li(SO₄)₂