Research output: Contribution to journal › Article › peer-review
Structure of K,Na-Exchanged Stellerite Zeolite and its Evolution under High Pressures. / Seryotkin, Yu V.; Bakakin, V. V.
In: Journal of Structural Chemistry, Vol. 60, No. 10, 01.10.2019, p. 1612-1621.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Structure of K,Na-Exchanged Stellerite Zeolite and its Evolution under High Pressures
AU - Seryotkin, Yu V.
AU - Bakakin, V. V.
PY - 2019/10/1
Y1 - 2019/10/1
N2 - K,Na-exchanged stellerite |K6.35Na1.53(H2O)25|[Al7.89Si28.11O72], space group F2/m, a = 13.6212(5) Å, b = 18.1589(7) Å, c = 17.8495(5) Å, β = 90.202(3)°, V = 4415.0(3) Å3, Z = 2, is studied by single-crystal X-ray diffraction under ambient conditions and upon compression to 3.5 GPa in water-containing penetrating and non-penetrating (paraffin) media. A specific property of the structure of the K,Na-exchanged form is a vacancy at the site that is occupied by Ca2+ cations in initial stellerite. The cations are distributed over six main positions with a local coordination 7–10 for K+ and 5 for Na+. The compression of K,Na-exchanged stellerite in the 4:1 ethanol:water mixture causes its additional hydration: initially, due to the occupation of partially vacant H2O sites and then, upon further compression, due to the occupation of initially vacant positions. The environment of the cations in other positions is not changed substantially in the course of overhydration. The differences in the degree of hydration of the K,Na-exchanged form under compression in penetrating and non-penetrating media are manifested in the characteristics of the compound’s compressibility.
AB - K,Na-exchanged stellerite |K6.35Na1.53(H2O)25|[Al7.89Si28.11O72], space group F2/m, a = 13.6212(5) Å, b = 18.1589(7) Å, c = 17.8495(5) Å, β = 90.202(3)°, V = 4415.0(3) Å3, Z = 2, is studied by single-crystal X-ray diffraction under ambient conditions and upon compression to 3.5 GPa in water-containing penetrating and non-penetrating (paraffin) media. A specific property of the structure of the K,Na-exchanged form is a vacancy at the site that is occupied by Ca2+ cations in initial stellerite. The cations are distributed over six main positions with a local coordination 7–10 for K+ and 5 for Na+. The compression of K,Na-exchanged stellerite in the 4:1 ethanol:water mixture causes its additional hydration: initially, due to the occupation of partially vacant H2O sites and then, upon further compression, due to the occupation of initially vacant positions. The environment of the cations in other positions is not changed substantially in the course of overhydration. The differences in the degree of hydration of the K,Na-exchanged form under compression in penetrating and non-penetrating media are manifested in the characteristics of the compound’s compressibility.
KW - high pressure
KW - K,Na-exchanged stellerite
KW - pressure-induced hydration
KW - structure
KW - zeolites
KW - BEHAVIOR
KW - X-RAY-DIFFRACTION
KW - STI
KW - K
KW - POLYMORPHISM
KW - Na-exchanged stellerite
KW - REFINEMENT
KW - DEHYDRATION
KW - INDUCED PENETRATION
KW - CLINOPTILOLITE
KW - BARRERITE
UR - http://www.scopus.com/inward/record.url?scp=85074629858&partnerID=8YFLogxK
U2 - 10.1134/S0022476619100068
DO - 10.1134/S0022476619100068
M3 - Article
AN - SCOPUS:85074629858
VL - 60
SP - 1612
EP - 1621
JO - Journal of Structural Chemistry
JF - Journal of Structural Chemistry
SN - 0022-4766
IS - 10
ER -
ID: 22363225