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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

Authors
  • Ksenofontov, D. A.1
  • Grebenev, V. V.2
  • Zubkova, N. V.1
  • Pekov, I. V.1, 3
  • Kabalov, Yu. K.1
  • Chukanov, N. V.4
  • Pushcharovsky, D. Yu.1
  • Artamonova, A. A.1
  • 1 Geological Faculty, Moscow State University, Moscow, 119991, Russia , Moscow (Russia)
  • 2 Institute of Crystallography of Federal Research Center “Crystallography and Photonics”, Moscow, 119333, Russia , Moscow (Russia)
  • 3 Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, 117975, Russia , Moscow (Russia)
  • 4 Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia , Chernogolovka (Russia)
Type
Published Article
Journal
Geology of Ore Deposits
Publisher
Pleiades Publishing
Publication Date
Dec 01, 2019
Volume
61
Issue
7
Pages
696–705
Identifiers
DOI: 10.1134/S1075701519070080
Source
Springer Nature
Keywords
License
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Abstract

AbstractThermal 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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