Irreversible Li+/H+ ion-exchange reaction between cubic HNbO3 and rhombohedral LiNbO3 and NMR study of LixH1−xNbO3

Ohsaka, Tohru; Kanzaki, Yasushi; Abe, Mitsuo

doi:10.1016/s0025-5408(01)00690-0

Cited by 5 publications

(31 citation statements)

References 20 publications

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“…According to the theoretical prediction, the decrease in the reduced partition function in the solid phase was found to increase the isotope separation coefficient. Oi et al have reported the 7 Li/ 6 Li isotope separation on some antimonic acids. 9,10 They discussed the origin of the high separation coefficient based on the dehydration property of lithium ions in the solid phase as well as RPFR.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, they did not have sufficient information on the dehydration property, and in addition, no Raman data were available at the time. Ooi et al reported the 7 Li/ 6 Li isotope separation on some lithium manganese oxides. 11 They interpreted the observed value on the basis of the ion-sieve property of these oxides.…”

Section: Introductionmentioning

confidence: 99%

“…The authors have assumed that the ion-exchangers that have high lithium ion selectivity and sorb lithium ions in the dehydrated state must have high isotope separation coefficient between 7 Li and 6 Li. The relation between the ion-exchange selectivity of lithium ions and the dehydration property has already been reported on the basis of the solid-state NMR study.…”

Section: Introductionmentioning

confidence: 99%

“…The relation between the ion-exchange selectivity of lithium ions and the dehydration property has already been reported on the basis of the solid-state NMR study. [3][4][5][6][7] Some results on the relation between the dehydration property and 7 Li/ 6 Li isotope separation coefficient have already been reported as a preliminary note. 12 This paper deals with the experimental and theoretical proofs on the assumption that the dehydration degree in the solid phase is dominant factor to determine 7 Li/ 6 Li isotope separation coefficient.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5][6][7] Some results on the relation between the dehydration property and 7 Li/ 6 Li isotope separation coefficient have already been reported as a preliminary note. 12 This paper deals with the experimental and theoretical proofs on the assumption that the dehydration degree in the solid phase is dominant factor to determine 7 Li/ 6 Li isotope separation coefficient.…”

Section: Introductionmentioning

confidence: 99%

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⁷Li/⁶Li Isotope Separation on Inorganic Ion-Exchangers and NMR Study of the H⁺/Li⁺ Ion-Exchange Reaction

Kanzaki

Suzuki

2002

J. Phys. Chem. B

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The isotope separation between 7Li and 6Li was examined on several inorganic ion-exchangers that are selective for lithium ions. The isotope separation coefficient, S(7/6), was measured by the batch method. The hydration property of lithium ions in the amorphous ion-exchangers was examined by the solid NMR and for crystalline ones either by the solid NMR or the X-ray diffraction analysis. The ion-exchangers that have high lithium ion selectivity had a tendency to enrich 6Li and resultant high S(7/6). The observed S(7/6) increased with increasing the degree of dehydration in the solid phase. The ion-exchangers that sorbed lithium ions in completely dehydrated state exhibited a high isotope separation coefficient, and the highest value of 1.04 was attained on cubic-HNbO3. The observed S(7/6) were accounted for the statistical isotope reduced partition function ratio (RPFR) of the vibrational mode for the isotopes of interest, f(7/6). The observed S(7/6) for cubic-HNbO3 was accounted for in the Raman spectrum data that reflect the vibrational energy state. The value 1.04 observed on cubic-HNbO3 was in consistent with the theoretical prediction. In addition, the theoretical (highest) 7Li/6Li isotope separation coefficient was estimated to be around 1.05 at 25 °C between aqueous solution and HMO3 (M = Sb, Nb, and Ta) in which lithium ions were sorbed in the completely dehydrated state.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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⁷Li/⁶Li Isotope Separation on Inorganic Ion-Exchangers and NMR Study of the H⁺/Li⁺ Ion-Exchange Reaction

Kanzaki

Suzuki

2002

J. Phys. Chem. B

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Complete, reversible H+/Li+ ion exchange reaction between rhombohedral LiMO3 and perovskite-type HMO3 (M=Nb, Ta)

Thangadurai¹,

Weppner²

2002

Materials Research Bulletin

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Ab Initio Study of Hydrogen Niobate HNbO₃: Structural, Thermodynamic, Dielectric, and Optical Properties

et al. 2023

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Using first-principles calculations, we study the ground-state structure of bulk proton-exchanged lithium niobate, which is also called hydrogen niobate and is widely used in waveguides. Thermodynamics helps to establish the most favorable nonpolar surface as well as the water-deficient and water-rich phases under different ambient conditions, which we refer to as "dehydrated" and "rehydrated" phases, respectively. We compute the low-frequency dielectric response and the optical refractive indices of hydrogen niobate in different phases. The dielectric constant is greatly enhanced compared to lithium niobate. At shorter wavelengths, the refractive indices vary between each phase and have a sharp contrast to lithium niobate. Our study characterizes the structures and thermal instabilities of this compound and reveals its excellent dielectric and optical properties, which can be important in the future application in waveguides.

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Irreversible Li+/H+ ion-exchange reaction between cubic HNbO3 and rhombohedral LiNbO3 and NMR study of LixH1−xNbO3

Cited by 5 publications

References 20 publications

⁷Li/⁶Li Isotope Separation on Inorganic Ion-Exchangers and NMR Study of the H⁺/Li⁺ Ion-Exchange Reaction

⁷Li/⁶Li Isotope Separation on Inorganic Ion-Exchangers and NMR Study of the H⁺/Li⁺ Ion-Exchange Reaction

Complete, reversible H+/Li+ ion exchange reaction between rhombohedral LiMO3 and perovskite-type HMO3 (M=Nb, Ta)

Ab Initio Study of Hydrogen Niobate HNbO₃: Structural, Thermodynamic, Dielectric, and Optical Properties

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Irreversible Li+/H+ ion-exchange reaction between cubic HNbO3 and rhombohedral LiNbO3 and NMR study of LixH1−xNbO3

Cited by 5 publications

References 20 publications

7Li/6Li Isotope Separation on Inorganic Ion-Exchangers and NMR Study of the H+/Li+ Ion-Exchange Reaction

7Li/6Li Isotope Separation on Inorganic Ion-Exchangers and NMR Study of the H+/Li+ Ion-Exchange Reaction

Complete, reversible H+/Li+ ion exchange reaction between rhombohedral LiMO3 and perovskite-type HMO3 (M=Nb, Ta)

Ab Initio Study of Hydrogen Niobate HNbO3: Structural, Thermodynamic, Dielectric, and Optical Properties

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⁷Li/⁶Li Isotope Separation on Inorganic Ion-Exchangers and NMR Study of the H⁺/Li⁺ Ion-Exchange Reaction

⁷Li/⁶Li Isotope Separation on Inorganic Ion-Exchangers and NMR Study of the H⁺/Li⁺ Ion-Exchange Reaction

Ab Initio Study of Hydrogen Niobate HNbO₃: Structural, Thermodynamic, Dielectric, and Optical Properties