Article Hyperfine couplings between the paramagnetic moment and nuclei in the metallic phase of low silica X zeolite loaded with potassium

Mutsuo Igarashi ORCID ; Tadashi Shimizu SAMURAI ORCID ; Atsushi Goto SAMURAI ORCID ; Kenjiro Hashi SAMURAI ORCID ; Keiko Yamamichi ; Takehito Nakano ORCID

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Mutsuo Igarashi, Tadashi Shimizu, Atsushi Goto, Kenjiro Hashi, Keiko Yamamichi, Takehito Nakano. Hyperfine couplings between the paramagnetic moment and nuclei in the metallic phase of low silica X zeolite loaded with potassium. Dalton Transactions. 2024, 53 (23), 9838-9843.
SAMURAI

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(abstract)

Temperature dependences of NMR spectra have been observed for 23Na and 27Al in the metallic phase of Na–K form low silica X (LSX) zeolite loaded with potassium, where the condition of saturation is achieved with a loading level of 9.0 atoms per supercage and the paramagnetic moment contributes to the magnetism of the system beyond simple isolated spin. Two separated peaks have been recognized for 23Na, where the shift values show a quite linear relationship with susceptibility, and the so-called K–χ plot works quite well to give values of 0.32 kOe/μB and 0.40 kOe/μB for hyperfine coupling constants. Although no separated peak is seen in the 27Al NMR spectrum, the spectral centroid deviates to the positive side. The shoulder of the spectrum scales to susceptibility and the K–χ plot also works well to give a value of 0.15 kOe/μB for the hyperfine coupling constant. The orbital of potassium-originated electrons confined in the cage of LSX is understood as seeping out over the framework of zeolite, which is wider than that of the sodium-originated case.

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Keyword: low silica X zeolite, NMR

Date published: 2024-05-28

Publisher: Royal Society of Chemistry (RSC)

Journal:

  • Dalton Transactions (ISSN: 14779226) vol. 53 issue. 23 p. 9838-9843

Funding:

  • Japan Society for the Promotion of Science JP15540353 (アルカリ金属吸蔵ゼオライトにおける新規電子物性探索)
  • Japan Society for the Promotion of Science JP15KK0165 (中性子散乱によるs電子強磁性の機構解明（国際共同研究強化）)
  • Japan Society for the Promotion of Science JP16K05462 (ゼオライトにおけるポーラロン誘起金属絶縁体転移をめぐる局所場ゆらぎ)
  • Japan Society for the Promotion of Science JP19K03738 (ラシュバ効果によるs電子系ナノクラスターのスピン軌道相互作用増強機構)
  • Ministry of Education, Culture, Sports, Science and Technology JP19051009 (ゼオライト系化合物の物質探索)

Manuscript type: Author's version (Accepted manuscript)

MDR DOI:

First published URL: https://doi.org/10.1039/d4dt00599f

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Updated at: 2024-06-13 08:42:43 +0900

Published on MDR: 2025-05-28 08:19:39 +0900

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