Cation ordering in zvyaginite: new data on composition and structure
- 作者: Panikorovskii T.L.1,2, Goychuk O.F.1, Yakovenchuk V.N.1, Gosteva A.N.3,4, Pekov I.V.5, Krivovichev S.V.1,2
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隶属关系:
- Kola Science Centre RAS
- Saint Petersburg State University
- Chemistry KSC RAS
- Murmansk Arctic University
- Moscow State University
- 期: 卷 CLIII, 编号 5 (2024)
- 页面: 156-174
- 栏目: МИНЕРАЛОГИЧЕСКАЯ КРИСТАЛЛОГРАФИЯ
- URL: https://bakhtiniada.ru/0869-6055/article/view/281300
- DOI: https://doi.org/10.31857/S0869605524050083
- EDN: https://elibrary.ru/PCDGIS
- ID: 281300
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详细
A new modification of zvyagignite from agpaitic pegmatite at Mt. Kuamdespakhk, Lovozero massif, Kola Peninsula, was studied. It is triclinic, space P-1. a = 5.4141(2), b = 7.1410(6), c = 12.0831(12) Å, α = 104.963(8), β = 95.294(6), γ = 90.048(5)°, V = 449.24(6) Å3. This zvyaginite modification is formed by natural cation exchange reaction 2Na+ ↔ □ + Zn2+ and inherit unit cell parameters from epistolite. This modification of zvyaginite is considered as disordered, or zvyaginite-1Tc, in contrast to the previously known modification with doubled unit cell volume (ordered modification, or zvyaginite-2Tc) In the disordered modification of zvyaginite Zn2+ incorporates exclusively at the octahedral layer, whereas the formation of ordered zvyaginite can be associated with a greater exchange completeness, when Zn2+ incorporates at heteropolyhedral layer, where it’s even a small admixture is sufficient to change the geometry of Si2O7 groups and doubling of unit cell parameters. Variations in the chemical composition of zvyaginite allow us to propose for it a generalized formula Na2-хZnNb2Ti(Si2O7)2[(OH)2+xO2-x]⸱4H2O (0 ≤ x ≤ 1).
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作者简介
T. Panikorovskii
Kola Science Centre RAS; Saint Petersburg State University
编辑信件的主要联系方式.
Email: t.panikorovskii@ksc.ru
Д. чл., Санкт-Петербургский государственный университет, кафедра кристаллографии
俄罗斯联邦, Apatity; Saint PetersburgO. Goychuk
Kola Science Centre RAS
Email: t.panikorovskii@ksc.ru
俄罗斯联邦, Apatity
V. Yakovenchuk
Kola Science Centre RAS
Email: t.panikorovskii@ksc.ru
д. чл.
俄罗斯联邦, ApatityA. Gosteva
Chemistry KSC RAS; Murmansk Arctic University
Email: t.panikorovskii@ksc.ru
I.V. Tananaev Institute of Chemistry KSC RAS
俄罗斯联邦, Apatity; MurmanskI. Pekov
Moscow State University
Email: t.panikorovskii@ksc.ru
почетный член, Геологический факультет
俄罗斯联邦, MoscowS. Krivovichev
Kola Science Centre RAS; Saint Petersburg State University
Email: t.panikorovskii@ksc.ru
д. чл., Санкт-Петербургский государственный университет, кафедра кристаллографии
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