Refractometry of mechanically compressed (NH4)2SO4 crystals

Stadnyk, V. Yo.; Romanyuk, N. A.; Tuzyak, M. R.; Brezvin, R. S.; Matviishin, I. M.; Gaba, V. M.

doi:10.1134/s0030400x0806012x

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“…It is also known to be ferroelastic in both the paraelectric and ferroelectric phases. [4][5][6][7][8][9][10][11] At room temperature, the crystal possesses orthorhombic symmetry (space group Pnam-D 2h 16 ), with lattice constants a=7.782Å, b=10.636Å, and c=5.993 Å. 12 They undergo a phase transition without changing the number of formula units Z=4 in the unit cell at T C .…”

Section: Introductionmentioning

confidence: 99%

Paraelectric-Ferroelectric Phase Transition of (NH₄)₂SO₄ Single Crystals by ¹⁴N NMR

Lim¹

2017

Journal of the Korean Magnetic Resonance Society

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The 14 N NMR spectra for (NH 4 ) 2 SO 4 crystals were obtained near the phase transition temperature T C =223 K, and were found to precisely reflect the symmetry change in the crystal at this first-order phase transition. Changes in the resonance frequencies near T C were attributed to the structural phase transition. In the ferroelectric and paraelectric phases, two inequivalent NH 4 groups were distinguished in the 14 N NMR spectra. The two types, NH 4 (1) and NH 4 (2), have slightly different local environments. Consequently, we conclude that the phase transition is caused by the change in the environment of the 14 N nuclei in the NH 4 groups, rather than by the SO 4 groups.

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Section: Introductionmentioning

confidence: 99%

Paraelectric-Ferroelectric Phase Transition of (NH₄)₂SO₄ Single Crystals by ¹⁴N NMR

Lim¹

2017

Journal of the Korean Magnetic Resonance Society

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Photoelasticity of ammonium sulfate crystals

et al. 2019

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Refractometry of mechanically compressed (NH4)2SO4 crystals

Cited by 2 publications

References 5 publications

Paraelectric-Ferroelectric Phase Transition of (NH₄)₂SO₄ Single Crystals by ¹⁴N NMR

Paraelectric-Ferroelectric Phase Transition of (NH₄)₂SO₄ Single Crystals by ¹⁴N NMR

Photoelasticity of ammonium sulfate crystals

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Refractometry of mechanically compressed (NH4)2SO4 crystals

Cited by 2 publications

References 5 publications

Paraelectric-Ferroelectric Phase Transition of (NH4)2SO4 Single Crystals by 14N NMR

Paraelectric-Ferroelectric Phase Transition of (NH4)2SO4 Single Crystals by 14N NMR

Photoelasticity of ammonium sulfate crystals

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Paraelectric-Ferroelectric Phase Transition of (NH₄)₂SO₄ Single Crystals by ¹⁴N NMR

Paraelectric-Ferroelectric Phase Transition of (NH₄)₂SO₄ Single Crystals by ¹⁴N NMR