Selective Octahedral Accommodation of Cr$^{3+}$ and Weak Magnetic Connectivity in the Sugilite Analogue KNa$_2$Cr$_2$Li$_3$Si$_{12}$O$_{30}$
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| Format: | Preprint |
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2026
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| _version_ | 1866917490407243776 |
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| author | Haraguchi, Yuya Aoki, Taishu Nishio-Hamane, Daisuke Katori, Hiroko Aruga |
| author_facet | Haraguchi, Yuya Aoki, Taishu Nishio-Hamane, Daisuke Katori, Hiroko Aruga |
| contents | We report the synthesis of the Cr analogue of sugilite, KNa$_2$Cr$_2$Li$_3$Si$_{12}$O$_{30}$, in the milarite-type framework. Rietveld refinement of a composition-conserving antisite model gives $x = 0.0024(18)$ in KNa$_2$[Cr$_{2-x}$Li$_x$][Li$_{3-x}$Cr$_x$]Si$_{12}$O$_{30}$, corresponding to a T2-site Cr occupancy of $0.0008(6)$. X-ray MEM analysis shows no detectable Cr-like density at T2. Magnetic susceptibility indicates weak antiferromagnetic interactions with $θ_{\mathrm{W}} = -4.78(7)$ K and no ordering above 1.8 K. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_12986 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Selective Octahedral Accommodation of Cr$^{3+}$ and Weak Magnetic Connectivity in the Sugilite Analogue KNa$_2$Cr$_2$Li$_3$Si$_{12}$O$_{30}$ Haraguchi, Yuya Aoki, Taishu Nishio-Hamane, Daisuke Katori, Hiroko Aruga Materials Science We report the synthesis of the Cr analogue of sugilite, KNa$_2$Cr$_2$Li$_3$Si$_{12}$O$_{30}$, in the milarite-type framework. Rietveld refinement of a composition-conserving antisite model gives $x = 0.0024(18)$ in KNa$_2$[Cr$_{2-x}$Li$_x$][Li$_{3-x}$Cr$_x$]Si$_{12}$O$_{30}$, corresponding to a T2-site Cr occupancy of $0.0008(6)$. X-ray MEM analysis shows no detectable Cr-like density at T2. Magnetic susceptibility indicates weak antiferromagnetic interactions with $θ_{\mathrm{W}} = -4.78(7)$ K and no ordering above 1.8 K. |
| title | Selective Octahedral Accommodation of Cr$^{3+}$ and Weak Magnetic Connectivity in the Sugilite Analogue KNa$_2$Cr$_2$Li$_3$Si$_{12}$O$_{30}$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2605.12986 |