Measurement of pressure using the inversion of (NH4)2BeF4 crystal birefringence

Стадник, В. И.; Romanyuk, N. A.; Brezvin, R. S.

doi:10.1007/bf02683908

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“…Its unit-cell dimensions are a = 5.8 Å, b = 10.1 Å, c = 7.5 Å and Z = 4 [14]; however, no detailed crystal structure has been reported for this compound. In the RbNH 4 SO 4 crystals, the phase-transition temperatures are 120 and 189 K [15,16]. The structure of an RbNH 4 SO 4 crystal at room temperature was found to be orthorhombic, with the space group Pnma and the unit-cell dimensions: a = 7.8303 Å, b = 5.9772 Å, c = 10.4677 Å and Z = 4 [17].…”

Section: Introductionmentioning

confidence: 98%

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: Introductionmentioning

confidence: 98%

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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Measurement of pressure using the inversion of (NH4)2BeF4 crystal birefringence

Cited by 1 publication

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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

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Measurement of pressure using the inversion of (NH4)2BeF4 crystal birefringence

Cited by 1 publication

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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

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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