109Ag NMR and relaxation mechanism in single crystal Ag β-alumina

Yoshiki Iwai; Osamu Kamishima; Naoaki Kuwata; Junichi Kawamura; Takeshi Hattori

doi:10.1016/j.ssi.2008.02.003

¹⁰⁹Ag NMR and relaxation mechanism in single crystal Ag β-alumina

Yoshiki Iwai, Osamu Kamishima, Naoaki Kuwata, Junichi Kawamura, Takeshi Hattori

University Research Administration (URA) Center

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Temperature dependence of ¹⁰⁹Ag NMR spectrum and spin-lattice relaxation T₁ was measured for a single crystal of Ag β-alumina (Ag_1.17Al₁₁O_17.09) at external magnetic field of 4.7 T (9.3 MHz) and 9.4 T (18.6 MHz). Only a single spectrum peak is observed at room temperature, it reflects fast site exchange of Ag ions. The chemical shift of the peak position depends on the angle between c-axis and external field B₀. From the angle dependence, the values of screening tensor are determined to be, σ_xx^PAS = σ_yy^PAS = - 54.7 ppm, σ_zz^PAS = - 212 ppm. The large difference between σ_zz^PAS and σ_xx^PAS indicates a strong interaction between Ag and surrounding oxygen. The relaxation mechanism is discussed using the Scalar Coupling (SC) model and Screening Tensor Fluctuation (STF) model. The field dependence of the T₁ observed at 4.7 T and 9.4 T strongly supports the SC model. It suggests that there are strong correlations between Ag ions in β-alumina and it probably plays an important role to the high ionic conductivity.

Original language	English
Pages (from-to)	862-866
Number of pages	5
Journal	Solid State Ionics
Volume	179
Issue number	21-26
DOIs	https://doi.org/10.1016/j.ssi.2008.02.003
Publication status	Published - 2008 Sept 15

Keywords

Ag NMR
Ag β-alumina
Magnetic screening tensor
Relaxation mechanism

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1016/j.ssi.2008.02.003

Cite this

@article{e825a745f8dc40dcb8f5849fd93391f3,

title = "109Ag NMR and relaxation mechanism in single crystal Ag β-alumina",

abstract = "Temperature dependence of 109Ag NMR spectrum and spin-lattice relaxation T1 was measured for a single crystal of Ag β-alumina (Ag1.17Al11O17.09) at external magnetic field of 4.7 T (9.3 MHz) and 9.4 T (18.6 MHz). Only a single spectrum peak is observed at room temperature, it reflects fast site exchange of Ag ions. The chemical shift of the peak position depends on the angle between c-axis and external field B0. From the angle dependence, the values of screening tensor are determined to be, σxxPAS = σyyPAS = - 54.7 ppm, σzzPAS = - 212 ppm. The large difference between σzzPAS and σxxPAS indicates a strong interaction between Ag and surrounding oxygen. The relaxation mechanism is discussed using the Scalar Coupling (SC) model and Screening Tensor Fluctuation (STF) model. The field dependence of the T1 observed at 4.7 T and 9.4 T strongly supports the SC model. It suggests that there are strong correlations between Ag ions in β-alumina and it probably plays an important role to the high ionic conductivity.",

keywords = "Ag NMR, Ag β-alumina, Magnetic screening tensor, Relaxation mechanism",

author = "Yoshiki Iwai and Osamu Kamishima and Naoaki Kuwata and Junichi Kawamura and Takeshi Hattori",

note = "Funding Information: This work was partly supported by the Grant-in-Aid of Ministry of Education, Culture, Sports, Science and Technology of Japan.",

year = "2008",

month = sep,

day = "15",

doi = "10.1016/j.ssi.2008.02.003",

language = "English",

volume = "179",

pages = "862--866",

journal = "Solid State Ionics",

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TY - JOUR

T1 - 109Ag NMR and relaxation mechanism in single crystal Ag β-alumina

AU - Iwai, Yoshiki

AU - Kamishima, Osamu

AU - Kuwata, Naoaki

AU - Kawamura, Junichi

AU - Hattori, Takeshi

N1 - Funding Information: This work was partly supported by the Grant-in-Aid of Ministry of Education, Culture, Sports, Science and Technology of Japan.

PY - 2008/9/15

Y1 - 2008/9/15

N2 - Temperature dependence of 109Ag NMR spectrum and spin-lattice relaxation T1 was measured for a single crystal of Ag β-alumina (Ag1.17Al11O17.09) at external magnetic field of 4.7 T (9.3 MHz) and 9.4 T (18.6 MHz). Only a single spectrum peak is observed at room temperature, it reflects fast site exchange of Ag ions. The chemical shift of the peak position depends on the angle between c-axis and external field B0. From the angle dependence, the values of screening tensor are determined to be, σxxPAS = σyyPAS = - 54.7 ppm, σzzPAS = - 212 ppm. The large difference between σzzPAS and σxxPAS indicates a strong interaction between Ag and surrounding oxygen. The relaxation mechanism is discussed using the Scalar Coupling (SC) model and Screening Tensor Fluctuation (STF) model. The field dependence of the T1 observed at 4.7 T and 9.4 T strongly supports the SC model. It suggests that there are strong correlations between Ag ions in β-alumina and it probably plays an important role to the high ionic conductivity.

AB - Temperature dependence of 109Ag NMR spectrum and spin-lattice relaxation T1 was measured for a single crystal of Ag β-alumina (Ag1.17Al11O17.09) at external magnetic field of 4.7 T (9.3 MHz) and 9.4 T (18.6 MHz). Only a single spectrum peak is observed at room temperature, it reflects fast site exchange of Ag ions. The chemical shift of the peak position depends on the angle between c-axis and external field B0. From the angle dependence, the values of screening tensor are determined to be, σxxPAS = σyyPAS = - 54.7 ppm, σzzPAS = - 212 ppm. The large difference between σzzPAS and σxxPAS indicates a strong interaction between Ag and surrounding oxygen. The relaxation mechanism is discussed using the Scalar Coupling (SC) model and Screening Tensor Fluctuation (STF) model. The field dependence of the T1 observed at 4.7 T and 9.4 T strongly supports the SC model. It suggests that there are strong correlations between Ag ions in β-alumina and it probably plays an important role to the high ionic conductivity.

KW - Ag NMR

KW - Ag β-alumina

KW - Magnetic screening tensor

KW - Relaxation mechanism

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