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Crystal Structures of Rb- and Ag-Substituted Forms of Natural Zeolite Amicite

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Abstract

The crystal structures of ion-exchange products of the zeolite-group mineral amicite from Khibiny Alkaline Massif with silver and rubidium salts have been studied. The investigated samples are monoclinic (sp. gr. P21 and I2/a); their crystallochemical formulas (Z = 1) are Ag8(Al8Si8O32) ⋅ 10.6H2O and K0.4Na0.7Rb6.9(Al8Si8O32) ⋅ 4.5H2O; the unit cell parameters are a = 9.272(2) and 10.043(2) Å, b = 9.997(2) and 9.748(2) Å, c = 10.380(3) and 10.265(2) Å, β = 90.821(8)° and 90.09(3)°, V = 962.0(4) and 1005.0(3) Å3, respectively. In the Ag-amicite structure, 22 partially occupied sites of the extra-framework components (Ag and H2O) are localized. In the Rb-amicite structure, most of rubidium atoms are located in two sites with the occupancies of 0.414(6) and 0.389(5). The cross-sectional areas of the zeolite channels are 3.5 × 4.5 and 2.3 × 6.3 Å2 for Ag-amicite and 3.0 × 4.3 and 3.0 × 3.9 Å2 for Rb-amicite.

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Funding

The work was supported by the State assignment (registration no. AAAA-A19-119092390076-7) in the part concerning X-ray diffraction analysis and by the Russian Foundation for Basic Research, project no. 18-29-12007-MK, in the part concerning the determination of the chemical composition determination and ion-exchange experiments.

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    O. N. Kazheva, N. V. Chukanov, N. A. Chervonnaya, D. A. Varlamov & G. V. Shilov

  2. Moscow State University, 119234, Moscow, Russia

    N. V. Chukanov

  3. Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    D. A. Varlamov & V. N. Ermolaeva

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  1. O. N. Kazheva
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  2. N. V. Chukanov
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  3. N. A. Chervonnaya
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  4. D. A. Varlamov
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  5. V. N. Ermolaeva
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  6. G. V. Shilov
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Correspondence to O. N. Kazheva.

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Translated by E. Bondareva

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Kazheva, O.N., Chukanov, N.V., Chervonnaya, N.A. et al. Crystal Structures of Rb- and Ag-Substituted Forms of Natural Zeolite Amicite. Crystallogr. Rep. 66, 86–94 (2021). https://doi.org/10.1134/S1063774521010089

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  • DOI: https://doi.org/10.1134/S1063774521010089

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