NMR study of kaolinite. 2. 1H, 27Al, and 29Si spin-lattice relaxations

Shigenobu Hayashi; Takahiro Ueda; Kikuko Hayamizu; Etsuo Akiba

doi:10.1021/j100205a059

NMR study of kaolinite. 2. ¹H, ²⁷Al, and ²⁹Si spin-lattice relaxations

Shigenobu Hayashi, Takahiro Ueda, Kikuko Hayamizu, Etsuo Akiba

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20 Citations (Scopus)

Abstract

Spin-lattice relaxation tiroes of ¹H, ²⁷Al, and ²⁹Si spins in kaolinites with various origins have been measured at room temperature. Relaxation by paramagnetic impurities is dominant in those spins. Spin diffusion plays an important role in the ¹H and ²⁷Al relaxations, and their relaxations belong to the diffusion-limited case. ²⁹Si spins relax through the dipole-dipole interaction with electron spins directly, and the contribution of the spin diffusion is negligible. A part of the electron spins having an ESR signal at g = 4.1 play the role of relaxation centers. We have analyzed the relaxation times theoretically and have estimated the concentrations of paramagnetic impurities and the spin-lattice relaxation time of the electron spins.

Original language	English
Pages (from-to)	10928-10933
Number of pages	6
Journal	Journal of physical chemistry
Volume	96
Issue number	26
DOIs	https://doi.org/10.1021/j100205a059
Publication status	Published - 1992
Externally published	Yes

All Science Journal Classification (ASJC) codes

Engineering(all)
Physical and Theoretical Chemistry

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title = "NMR study of kaolinite. 2. 1H, 27Al, and 29Si spin-lattice relaxations",

abstract = "Spin-lattice relaxation tiroes of 1H, 27Al, and 29Si spins in kaolinites with various origins have been measured at room temperature. Relaxation by paramagnetic impurities is dominant in those spins. Spin diffusion plays an important role in the 1H and 27Al relaxations, and their relaxations belong to the diffusion-limited case. 29Si spins relax through the dipole-dipole interaction with electron spins directly, and the contribution of the spin diffusion is negligible. A part of the electron spins having an ESR signal at g = 4.1 play the role of relaxation centers. We have analyzed the relaxation times theoretically and have estimated the concentrations of paramagnetic impurities and the spin-lattice relaxation time of the electron spins.",

author = "Shigenobu Hayashi and Takahiro Ueda and Kikuko Hayamizu and Etsuo Akiba",

year = "1992",

doi = "10.1021/j100205a059",

language = "English",

volume = "96",

pages = "10928--10933",

journal = "Journal of Physical Chemistry",

issn = "0022-3654",

publisher = "American Chemical Society",

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T1 - NMR study of kaolinite. 2. 1H, 27Al, and 29Si spin-lattice relaxations

AU - Hayashi, Shigenobu

AU - Ueda, Takahiro

AU - Hayamizu, Kikuko

AU - Akiba, Etsuo

PY - 1992

Y1 - 1992

N2 - Spin-lattice relaxation tiroes of 1H, 27Al, and 29Si spins in kaolinites with various origins have been measured at room temperature. Relaxation by paramagnetic impurities is dominant in those spins. Spin diffusion plays an important role in the 1H and 27Al relaxations, and their relaxations belong to the diffusion-limited case. 29Si spins relax through the dipole-dipole interaction with electron spins directly, and the contribution of the spin diffusion is negligible. A part of the electron spins having an ESR signal at g = 4.1 play the role of relaxation centers. We have analyzed the relaxation times theoretically and have estimated the concentrations of paramagnetic impurities and the spin-lattice relaxation time of the electron spins.

AB - Spin-lattice relaxation tiroes of 1H, 27Al, and 29Si spins in kaolinites with various origins have been measured at room temperature. Relaxation by paramagnetic impurities is dominant in those spins. Spin diffusion plays an important role in the 1H and 27Al relaxations, and their relaxations belong to the diffusion-limited case. 29Si spins relax through the dipole-dipole interaction with electron spins directly, and the contribution of the spin diffusion is negligible. A part of the electron spins having an ESR signal at g = 4.1 play the role of relaxation centers. We have analyzed the relaxation times theoretically and have estimated the concentrations of paramagnetic impurities and the spin-lattice relaxation time of the electron spins.

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M3 - Article

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JF - Journal of Physical Chemistry

SN - 0022-3654

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ER -

NMR study of kaolinite. 2. ¹H, ²⁷Al, and ²⁹Si spin-lattice relaxations

Abstract

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