Ferroaxial Order of the Two-Dimensional Water of Crystallization in a Mineral

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Water molecules in the mineral martyite exhibit ferroaxial ordering driven by the formation of hydrogen-bonded toroidal hexamers, establishing it as a model system for studying two-dimensional ice. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.ESTABLISHES_NEW_DIRECTION.

Toshihiro Nomura; Shunsuke Kitou; Kenichiro Koga

doi:10.5940/jcrsj.68.166

August 31, 2026Nihon Kessho GakkaishiOpen Access

Ferroaxial Order of the Two-Dimensional Water of Crystallization in a Mineral

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Key Points

To investigate the low-temperature ordering and molecular behavior of dynamically disordered two-dimensional water molecules confined within the porous lattice of martyite.
Examined the structural organization of water molecules confined within the porous honeycomb framework of the mineral martyite Zn3(V2O7)(OH)2·2H2O.
Analyzed the transition of two-dimensional water from room-temperature dynamic disorder to low-temperature ordered states.
Demonstrated that dynamically disordered water molecules at room temperature undergo ferroaxial ordering at lower temperatures.
Identified the formation of hydrogen-bonded toroidal water hexamers as the primary driver of the ferroaxial phase transition.
Established martyite as a viable physical model system to probe two-dimensional ice behavior and water polymorphism.

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Implication

Structural analysis reveals ferroaxial ordering of two-dimensional water in martyite, highlighting a model system for investigating two-dimensional ice polymorphism.

Abstract

Martyite Zn3（V2O7）（OH）2・2H2O is a mineral with a honeycomb lattice of H2O in a porous framework. Due to geometrical frustration and its two-dimensional nature, H2O molecules are dynamically disordered at room temperature. In this study, we reveal ferroaxial ordering of H2O in martyite, driven by the formation of hydrogen-bonded toroidal H2O hexamers. Our results demonstrate that martyite is a model system for studying 2D ice, which may provide a clue to understanding the polymorphism of H2O.

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Nomura et al. (2026) studied this question.

synapsesocial.com/papers/6a99351f636c6408cfa7d0b1 https://doi.org/10.5940/jcrsj.68.166

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Ferroaxial Order of the Two-Dimensional Water of Crystallization in a Mineral

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Ferroaxial Order of the Two-Dimensional Water of Crystallization in a Mineral

Key Points

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Abstract

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