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) ų. 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.

中文翻译：

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Catapleiite在加热下的行为及其高温转变产物，具有SiO 4四面体九元环的新相Na 6 Zr 3 [Si 9 O 27]的晶体结构

摘要

catapleiite的热性能，理想的Na ₂ ZrSi ₃ ö ₉ ⋅2H ₂ O，已经研究了用X射线衍射，使用阻抗光谱，动态扫描量热法，热重，和红外光谱电导率测量。已经研究了在1000℃下对卡普莱石进行退火之后获得的卡普莱石的高温转化产物。这是一种新的微孔锆硅酸盐，理想的是Na ₆ Zr ₃ [Si ₉ O ₂₇ ]，代表一种新的结构类型。它是六角形的，P 6 ₃ / mcm，a = 11.5901（9），Ç = 9.9546（9）埃，V = 1158.05（16）一种³。它的晶体结构模型是使用单晶X射线衍射数据获得的，并根据粉末X射线衍射数据（R = 3.87％）通过Rietveld方法精制而成。该结构基于杂多面体骨架，该骨架与方铅矿基本不同，并且由SiO ₄四面体与孤立的ZrO ₆八面体连接的九元环Si ₉ O ₂₇构成。骨架外的Na阳离子位于骨架的宽通道中，位于四面体Si ₉ O ₂₇环之间。