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STRUCTURAL FEATURES OF HYDRATED REPRESENTATIVES OF THE LABUNTSOVITE GROUP: REFINEMENT OF CRYSTAL STRUCTURES OF INTERMEDIATE MEMBERS OF THE TSEPINITE-Na-"TSEPINITE-Ba"-TSEPINITE-K SOLID SOLUTION
被引：0
|作者：
Vaitieva, Yu. A.
[1
]
Chukanov, N. V.
[2
]
Vigasina, M. F.
[3
]
Varlamov, D. A.
[4
]
Volkov, S. N.
[1
]
Rastsvetaeva, R. K.
[5
]
Aksenov, S. M.
[1
,5
,6
]
机构：
[1] Russian Acad Sci, Kola Sci Ctr, Lab Arctic Mineral & Mat Sci, Apatity, Russia
[2] Russian Acad Sci, Fed Res Ctr Problems Chem Phys & Med Chem, Chernogolovka, Russia
[3] Moscow MV Lomonosov State Univ, Moscow, Russia
[4] Russian Acad Sci, Inst Expt Mineral, Chernogolovka, Russia
[5] Kurchatov Inst, Natl Res Ctr, Moscow, Russia
[6] Russian Acad Sci, Geol Inst, Kola Sci Ctr, Apatity, Russia
基金：
俄罗斯科学基金会;
关键词：
labuntsovite group minerals;
heteropolyhedral framework;
topology;
Raman spectroscopy;
hydrated complexes;
MICROPOROUS TITANOSILICATES;
TOPOLOGICAL ANALYSIS;
FRAMEWORK;
CHEMISTRY;
ZIRCONOSILICATES;
SILICATES;
MINERALS;
D O I：
10.1134/S0022476624070072
中图分类号：
O61 [无机化学];
学科分类号：
070301 ;
081704 ;
摘要：
Two mineral species of the labuntsovite group from Khibiny (sample 1) and Lovozero (sample 2) alkaline massifs are analyzed by single crystal X-ray diffraction and Raman spectroscopy. They are intermediate members of the tsepinite-Na-"tsepinite-Ba"-tsepinite-K solid solution, which are characterized by a high degree of hydration and a low concentration of extra-frame cations. Parameters of monoclinic cells are: a = 14.5086(6) angstrom, b = 14.2174(6) angstrom, c = 7.8712(3) angstrom, beta = 117.119(4)degrees, V = 1444.09(11) angstrom(3) (sample 1) and a = 14.2582(4) angstrom, b = 13.7541(6) angstrom, c = 7.7770(2) angstrom, beta = 116.893(4)degrees, V = 1360.20(9) angstrom(3) (sample 2). Crystal chemical formulas (Z = 2) are: |(A)[Na0.84K0.6[(H2O)(4)](5.2)](K0.2CBa0.25D)-K-B[Ca0.35Na0.15Fe0.025(H2O)]| {M1(Ti1.2Nb0.8)M2(Ti1.1Nb0.9)(O,OH)(4)(Si4O12)(2)} for sample 1 and |(A)[Na-1.6(H2O,H3O)(0.4)](K2C)-K-B(Ba0.51Sr0.21)(D) [Mn0.3Ca0.2(H2O)](H2O)(4)|{M1(Ti1.94Nb0.06)M2(Ti1.88Nb0.12)(O,OH)(4)(Si4O12)(2)} for sample 2. The high degree of hydration of sample 1 is expressed in the presence of proton hydrate complexes and tetrahedral [H2O](4)-associates. Labuntsovite group minerals (LGMs) are characterized by so-called block isomorphism due to different distributions of D cations. Our analysis of heteropolyhedral MT-frameworks in LGMs allows us to determine the topological features of cation networks.
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页码：1357 / 1370
页数：14
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