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Crystalline water intercalation into the Kitaev honeycomb cobaltate Na$_2$Co$_2$TeO$_6$
Masaaki Ito, Yuya Haraguchi, Teruki Motohashi, Miwa Saito, Satoshi Ogawa, Takashi Ikuta, Hiroko Aruga Katori
https://arxiv.org/abs/2508.08717

Crystalline water intercalation into the Kitaev honeycomb cobaltate Na$_2$Co$_2$TeO$_6$
We herein report the successful intercalation of water molecules into the layered honeycomb lattice of Na$_2$Co$_2$TeO$_6$, a Kitaev-candidate compound, to obtain the hydrated phase Na$_2$Co$_2$TeO$_6$$\cdot$$y$H$_2$O ($y \sim$ 2.4). Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, and Rietveld refinements indicate that crystalline water resides between the cobalt-based honeycomb layers. This insertion of neutral molecules significantly alt…