7Li Spin-Lattice Relaxation Time in a LiNH4SO4 Single Crystal

Lim, Ae Ran; Han, Tae Jong; Jeong, Se–Young

doi:10.1002/(sici)1521-3951(199908)214:2<375::aid-pssb375>3.0.co;2-9

Cited by 9 publications

(2 citation statements)

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“…Our observed changes in the activation energy are consistent with the values obtained by Shenoy and Ramakrishna for 1 H from studies of the relaxation times [21]. The large change in the activation energy observed at 285 K indicates that the LiO 4 groups are significantly affected during this transition [24]. The changes in the geometry of the oxygen atoms from the sulfate groups around the Li nucleus play an important role in the phase transition.…”

Section: H and 7 LI Nmr In Linh 4 So 4 Crystalssupporting

confidence: 89%

Study of the phase transitions by observation of the A and¹H nuclear magnetic resonance in ANH₄SO₄(A =⁷Li,³⁹K and⁸⁷Rb) single crystals with excellent optical quality

Lim¹,

Kim²

2008

J. Phys.: Condens. Matter

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ANH 4 SO 4 (A = Li, K and Rb) single crystals were grown using the slow evaporation method. We studied the spectra, spin-lattice relaxation times, T 1 , and spin-spin relaxation times, T 2 , of the 1 H, 7 Li, 39 K and 87 Rb nuclei in these three types of single crystals. The nuclear magnetic resonance observations provided a consistent description of the dynamics of the studied nuclei in these materials. The T 1 values for the 1 H nuclei are similar in all three crystals and the 1 H spin-lattice relaxation times increase with increasing temperature. However, as the radii of the metal ions increase, a corresponding decrease in the spin-lattice relaxation times of the A nuclei is observed. The differences observed in the spin-lattice relaxation times of the A nuclei upon changing the alkali-metal ion may be related to the ionic radius and the lengths of the A-O bonds. Therefore, the occurrence of phase transitions in these materials seems to be essentially dependent on the presence of the metal ions.

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Section: H and 7 LI Nmr In Linh 4 So 4 Crystalssupporting

confidence: 89%

Study of the phase transitions by observation of the A and¹H nuclear magnetic resonance in ANH₄SO₄(A =⁷Li,³⁹K and⁸⁷Rb) single crystals with excellent optical quality

Lim¹,

Kim²

2008

J. Phys.: Condens. Matter

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“…The discontinuity in the T 1 curve near 285 K corresponds to the phase transition between the orthorhombic and monoclinic structures, which means that the phase III to phase II transition is a firstorder transition. The relaxation time increases with temperature in both phases, although the rate of increase is slightly slower in phase II [28]. The activation energies in phases II and III for 7 Li in LiNH 4 SO 4 crystals were determined to be 0.88 and 1.93 kcal/mol, respectively.…”

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

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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Ab initio calculations of the electronic structure and specific optical features of β-LiNH4SO4 single crystals

Rudysh

Brik

Stadnyk

et al. 2018

Physica B: Condensed Matter

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7Li Spin-Lattice Relaxation Time in a LiNH4SO4 Single Crystal

Cited by 9 publications

References 9 publications

Study of the phase transitions by observation of the A and¹H nuclear magnetic resonance in ANH₄SO₄(A =⁷Li,³⁹K and⁸⁷Rb) single crystals with excellent optical quality

Study of the phase transitions by observation of the A and¹H nuclear magnetic resonance in ANH₄SO₄(A =⁷Li,³⁹K and⁸⁷Rb) single crystals with excellent optical quality

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

Ab initio calculations of the electronic structure and specific optical features of β-LiNH4SO4 single crystals

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7Li Spin-Lattice Relaxation Time in a LiNH4SO4 Single Crystal

Cited by 9 publications

References 9 publications

Study of the phase transitions by observation of the A and1H nuclear magnetic resonance in ANH4SO4(A =7Li,39K and87Rb) single crystals with excellent optical quality

Study of the phase transitions by observation of the A and1H nuclear magnetic resonance in ANH4SO4(A =7Li,39K and87Rb) single crystals with excellent optical quality

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

Ab initio calculations of the electronic structure and specific optical features of β-LiNH4SO4 single crystals

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Study of the phase transitions by observation of the A and¹H nuclear magnetic resonance in ANH₄SO₄(A =⁷Li,³⁹K and⁸⁷Rb) single crystals with excellent optical quality

Study of the phase transitions by observation of the A and¹H nuclear magnetic resonance in ANH₄SO₄(A =⁷Li,³⁹K and⁸⁷Rb) single crystals with excellent optical quality