Abstract
Thermal behavior of catapleiite, ideally Na2ZrSi3O9 ⋅ 2H2O, has been investigated with the X-ray diffraction, electroconductivity measurements using impedance spectroscopy, dynamic scanning calorimetry, thermal gravimetry, and infrared spectroscopy. The high-temperature transformation product of catapleiite obtained after annealing of catapleiite at 1000°C has been studied. This is a new microporous zirconosilicate, ideally Na6Zr3[Si9O27], representing a new structural type. It is hexagonal, P63/mcm, a = 11.5901(9), c = 9.9546(9) Å, V = 1158.05(16) Å3. Its crystal structure model has been obtained using single-crystal X-ray diffraction data and refined by the Rietveld method on the basis of the powder X-ray diffraction data (R = 3.87%). The structure is based on the heteropolyhedral framework, which substantially differs from that of catapleiite and is built by nine-member rings Si9O27 formed by SiO4 tetrahedra linked with isolated ZrO6 octahedra. Extraframework Na cations are located in broad channels of the framework and between the tetrahedral Si9O27 rings.
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This study has been supported by the Russian Foundation for Basic Research (project no 18-05-00332) in regard to the powder X-ray diffraction study.
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Translated by I. Baksheev
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Ksenofontov, D.A., Grebenev, V.V., Zubkova, N.V. et al. Behavior of Catapleiite under Heating and Crystal Structure of its High-Temperature Transformation Product, a New Phase Na6Zr3[Si9O27] with Nine-membered Rings of SiO4 Tetrahedra. Geol. Ore Deposits 61, 696–705 (2019). https://doi.org/10.1134/S1075701519070080
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DOI: https://doi.org/10.1134/S1075701519070080