An EPR study of the disorder and structural phase transitions of lithium potassium sulfate

Yu, Jiang Tsu; Kou, Jin Meei; Huang, Shu Jeu; Co, Lie Shuenn

doi:10.1016/0022-3697(86)90120-4

Cited by 25 publications

(1 citation statement)

References 11 publications

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“…The increasing number of studies being performed on the physical properties of LiXSO 4 (X = K, Rb, Cs and NH 4 ) single crystals are largely owing to its excellent optical quality. These crystals have previously been investigated by means of x-ray diffraction [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], Raman spectroscopy [16][17][18][19][20][21][22][23][24][25][26][27][28], EPR [29][30][31][32][33][34][35][36][37][38][39][40][41], NMR [42][43][44][45][46][47][48][49][50]…”

Section: Introductionmentioning

confidence: 99%

Phase transition studied by⁷Li nuclear magnetic resonance in LiXSO₄(X = K, Rb, Cs and NH₄) single crystals

Lim¹,

Choh²,

Jeong³

2000

J. Phys.: Condens. Matter

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The temperature dependences of 7Li nuclear magnetic resonance in LiXSO4 (X = K, Rb, Cs, and NH4) single crystals grown by the slow evaporation method have been investigated by employing a Bruker FT NMR spectrometer. From the experimental data, the nuclear quadrupole constant, the asymmetry parameter and the principal axes of the EFG tensor were determined, and the results were compared with the crystal structure. The temperature dependences of the quadrupole parameters were explained with a single torsional mode of the Li-O bond by the Bayer theory. All the LiO4 tetrahedra in four different crystals showed torsional motion about the X-axis of the EFG tensor. Based on these results, the differences in atomic weight of X in the LiXSO4 single crystals are responsible for the differences in the torsional angular frequencies.

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Section: Introductionmentioning

confidence: 99%

Phase transition studied by⁷Li nuclear magnetic resonance in LiXSO₄(X = K, Rb, Cs and NH₄) single crystals

Lim¹,

Choh²,

Jeong³

2000

J. Phys.: Condens. Matter

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EPR study of low-temperature phase transitions in NH3+-Doped LiKSO4

Mikge

Waplak

Krajewski

1987

Phys. Stat. Sol. (a)

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The EPR spectra of the NH 3+ radical are used to probe the low temperature structural phase transitions of LiKSO4. Positional disorder of K+ ions proposed by Yu et al. is excluded. The low intensity lines accompanying the main EPR spectrum are explained in the “randomly oriented proton” model. Below about 190 K where the symmetry of EPR spectra lowers from axial to rhombic, the fragment of ferroelastic hysteresis loop is obtained from the EPR line intensity changing under uniaxial stress.

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Thermal Analysis and X-Ray Diffraction Study on LiKSO4: A New Phase Transition

Soláns

Calvet

Martínez-Sarrión

et al. 1999

Journal of Solid State Chemistry

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An EPR study of the disorder and structural phase transitions of lithium potassium sulfate

Cited by 25 publications

References 11 publications

Phase transition studied by⁷Li nuclear magnetic resonance in LiXSO₄(X = K, Rb, Cs and NH₄) single crystals

Phase transition studied by⁷Li nuclear magnetic resonance in LiXSO₄(X = K, Rb, Cs and NH₄) single crystals

EPR study of low-temperature phase transitions in NH3+-Doped LiKSO4

Thermal Analysis and X-Ray Diffraction Study on LiKSO4: A New Phase Transition

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An EPR study of the disorder and structural phase transitions of lithium potassium sulfate

Cited by 25 publications

References 11 publications

Phase transition studied by7Li nuclear magnetic resonance in LiXSO4(X = K, Rb, Cs and NH4) single crystals

Phase transition studied by7Li nuclear magnetic resonance in LiXSO4(X = K, Rb, Cs and NH4) single crystals

EPR study of low-temperature phase transitions in NH3+-Doped LiKSO4

Thermal Analysis and X-Ray Diffraction Study on LiKSO4: A New Phase Transition

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Product

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Phase transition studied by⁷Li nuclear magnetic resonance in LiXSO₄(X = K, Rb, Cs and NH₄) single crystals

Phase transition studied by⁷Li nuclear magnetic resonance in LiXSO₄(X = K, Rb, Cs and NH₄) single crystals