Rapid and phase pure synthesis of microporous copper silicate (CuSH-1Na) with 12-ring channel system
authors Lopes, AML; Lin, Z; Ferdov, S
nationality International
journal JOURNAL OF POROUS MATERIALS
author keywords Microporous copper silicate CuSH-1Na; Rapid synthesis; Ion exchange; Raman; Thermal properties; Magnetic properties
keywords CRYSTAL-STRUCTURE; TITANIUM-SILICATE; OPEN-FRAMEWORK; HYDROTHERMAL SYNTHESIS; MAGNETIC-STRUCTURES; ZEOLITE FRAMEWORK; TITANOSILICATE; EXCHANGE; PURIFICATION; ETS-10
abstract Phase pure sample of the microporous copper silicate CuSH-1Na has been obtained by simplified hydrothermal method without using additives (H2O2 and Na2HPO4). Ion exchange of Na+ by Cs+, Ca2+ and Sr2+ ions showed that the structure can suffer partial replacement of the charge compensating cations. Ion exchange with Cs+ resulted in distinct dehydration while the ion exchange with Sr2+ increased the total amount of water. Water content in the Ca-exchanged sample is comparable to the as-synthesized sodium phase. Raman spectroscopy revealed that the divalent cations as Ca2+ and Sr2+ induce stronger local structural deformations than the monovalent Cs+. These structural changes have been also followed by the refined lattice distortions. Magnetic analyses showed that CuSH-1Na presents a very weak ferromagnetic interaction along the Cu2+ chains with a nearly vanishing Curie-Weiss temperature. This magnetic coupling is associated with super-super-exchange interactions through Cu-Na-O-Na-Cu paths. Antiferromagnetic coupling, attributed to inter-chains super-super-exchange interactions, competes with the ferromagnetic one and prevails at the lowest temperature.
publisher SPRINGER
issn 1380-2224
year published 2018
volume 25
issue 5
beginning page 1309
ending page 1316
digital object identifier (doi) 10.1007/s10934-017-0541-8
web of science category Chemistry, Applied; Chemistry, Physical; Materials Science, Multidisciplinary
subject category Chemistry; Materials Science
unique article identifier WOS:000439747500005
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journal impact factor 2.183
5 year journal impact factor 1.949
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