Conclusions
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1.
After partial dehydration of zeolites A(LiA, NaA, KA, RbA, CsA, CaA, MgA) (degree of dehydration 50–70%), there is a small compression of their cubic structures with the formation of metaphases, the volume of the cubic unit cells of which remains constant upon further dehydration, while the density decreases.
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2.
The greatest thermal stability, determined by the temperature interval of the process of amorphization of the metaphase, is possessed by metaphases of zeolites with rather large exchange cations (K, Rb, Cs).
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3.
The final products of crystallization of the amorphized phase formed as a result of thermal decomposition of the metaphase areβ-eucryptite and anorthite for LiA and CaA, respectively; a mixture of hexagonal and cubic kaliophilites for KA; aluminosilicates with the composition R2O·Al2O3·2SiO2, where R=Rb, Cs, possessing no natural analogs for RbA and CsA; and magnesium aluminate of undetermined composition for MgA.
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Literature cited
R. M. Barrer and E. A. White, J. Chem. Soc., 1561 (1952).
D. W. Breck, W. E. Eversole, R. M. Milton, T. B. Read, and T. L. Thomas, J. Amer. Chem. Soc.,78, 5963 (1956).
I. E. Neimark, M. A. Piontkovskaya, A. E. Lukash, and R. S. Tyutyunnik, Synthetic Zeolites [in Russian], Izd-vo AN SSSR (1962), p. 49.
V. S. Vinogradova, L. S. Kofman, B. A. Lipkind, L. M. Medvedeva, and A. T. Slepneva, Zeolites, Their Synthesis, Properties, and Use [in Russian], Nauka (1965), p. 285.
A. S. Berger and L. K. Yakovlev, Zh. Prikl. Khim.,6, 1240 (1965).
K. Tot and T. Flora, Acta Chim. Hung.,45, No. 2, 87 (1965).
O. G. Piloyan and O. S. Novikova, Izv. Akad. Nauk SSSR, Neorgan. Mat.,2, 1298 (1966).
G. V. Gvakhariya and T. V. Batiashvili, Investigation of Phase Transformations of Certain Natural and Synthetic Zeolites by Methods of Thermal and X-Ray Diffraction Study. Summaries of Reports at the 8th All-Union Conference on Experimental and Technical Mineralogy and Petrography [in Russian], Izd-vo In-ta Geologii i Geofiziki SO AN SSSR, Novosibirsk (1968), p. 179.
I. A. Belitskii, Dissertation [in Russian], Novosibirsk (1969).
F. Freund, Ber. Dtsch. Keram. Ges.,37, No. 5, 209 (1960).
S. P. Zhdanov and E. N. Egorova, The Chemistry of Zeolites [in Russian], Nauka, Leningrad (1968).
G. V. Yukhnevich and É. É. Senderov, Geokhimiya,1, 48 (1963).
R. Roy, D. M. Roy, and E. F. Osborn, J. Amer. Ceram. Soc.,33, No. 5, 152 (1950).
G. Gruner, Z. Anorgan. und Allgem. Chem.,224, 365 (1935).
R. M. Barrer and N. McCallum, J. Chem. Soc., 4029 (1953).
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2129–2135, October, 1971.
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Berger, A.S., Samsonova, T.I. & Yakovlev, L.K. Thermal decomposition of cation exchange forms of zeolite A. Russ Chem Bull 20, 2015–2019 (1971). https://doi.org/10.1007/BF00851240
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DOI: https://doi.org/10.1007/BF00851240