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<p>The loading density <i>n</i> dependence of the hyperfine coupling constant <i>A</i> between <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(^{23}\)</EquationSource> </InlineEquation>Na and uniform susceptibility in the cage was examined using <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(^{23}\)</EquationSource> </InlineEquation>Na NMR spectra for Na-K form low-silica X zeolite loaded with potassium. As <i>n</i> increased and ferrimagnetic ordering disappeared, <i>A</i> grew several times larger. This can essentially be understood as an enhancement of the hyperfine interaction among the cages, owing to the denser electron condition. Other than such the effect, it is pointed out that a transitional change in local susceptibility may occur among the <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\beta\)</EquationSource> </InlineEquation> cage and the supercage, following the change of <i>n</i>.</p>

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Potassium loading density dependence of hyperfine coupling in Na-K alloy clusters in zeolite low-silica X

  • 期刊论文

  • 发表日期：

    2026年2月19日

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  • Mutsuo Igarashi,
  • Tadashi Shimizu,
  • Atsushi Goto,
  • Kenjiro Hashi,
  • Keiko Yamamichi,
  • Takehito Nakano

摘要

The loading density n dependence of the hyperfine coupling constant A between \(^{23}\) Na and uniform susceptibility in the cage was examined using \(^{23}\) Na NMR spectra for Na-K form low-silica X zeolite loaded with potassium. As n increased and ferrimagnetic ordering disappeared, A grew several times larger. This can essentially be understood as an enhancement of the hyperfine interaction among the cages, owing to the denser electron condition. Other than such the effect, it is pointed out that a transitional change in local susceptibility may occur among the \(\beta\) cage and the supercage, following the change of n.