PH₂O-dependent structural phase transitions in the zeolite mesolite: Real- and reciprocal-space crystal structure refinements
-
Hsiu-Wen Wang
,
David L. Bish
Abstract
The response of the mesolite crystal structure (Na16Ca16Al48Si72O240·64H2O) to dehydration was evaluated as a function of temperature and partial pressure of water (i.e., PH₂O or relative humidity, RH) using laboratory X-ray powder diffraction (XRD; CuKα radiation) and synchrotron X-ray pair distribution function (PDF) methods. At 425 °C under low-PH₂O conditions (PH₂O ≤ ~1.3 mbar), dehydrated mesolite preserved the long-range ordered aluminosilicate framework structure, which has not been previously observed. This new dehydrated phase, x-metamesolite, has unit-cell parameters [a = 16.731(3) Å, b = 17.822(2) Å, c = 6.312(1) Å, V = 1882.5(5) Å3, and possible space group Fdd2] similar to those of other dehydrated natrolite phases (either α1- or α2-metanatrolite). Conversely, under high-PH₂O conditions (PH₂O > ~1.3 mbar), dehydrated mesolite became amorphous (amorphous T5O10) at 425 °C. The local structure of amorphous T5O10 was characterized by PDF analyses, which showed the formation of twisted T5O10 nano-fibers [with dimensions (LWH) of ~6.9 × 6.9 × 6.3 Å] resulting from breakage of the mesolite aluminosilicate framework. The two distinct high-temperature PH₂O-dependent phase transition paths illustrate the importance of considering the combined effects of temperature and PH₂O in mesolite. In addition, the low-temperature phase transition in mesolite, involving order-disorder of the extraframework cations, also showed a PH₂O-dependent transition temperature. Although, there is no path dependence on PH₂O for this transition, the local arrangement of Na, Ca, and vacancies in disordered metamesolite (formed through the extraframework cation order-disorder phase transition) likely influences the thermal stability of the aluminosilicate framework during further heating.
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- TEM-assisted dynamic scanning force microscope imaging of (001) antigorite: Surfaces and steps on a modulated silicate
- PH₂O-dependent structural phase transitions in the zeolite mesolite: Real- and reciprocal-space crystal structure refinements
- The crystal structure of esperite, with a revised chemical formula, PbCa2(ZnSiO4)3, isostructural with beryllonite
- Dendritic zircon formation by deterministic volume-filling fractal growth: Implications for the mechanisms of branch formation in dendrites
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- Crystal chemistry of synthetic lawsonite solid-solution series CaAl2[(OH)2/Si2O7]·H2O– SrAl2[(OH)2/Si2O7]·H2O and the Cmcm–P21/m phase transition
- Coulsellite, CaNa3AlMg3F14, a rhombohedral pyrochlore with 1:3 ordering in both A and B sites, from the Cleveland Mine, Tasmania, Australia
- Synthesis and characterization of zeolite 4A-type desiccant from kaolin
- Effect of iron on the compressibility of hydrous ringwoodite
- Kapundaite, (Na,Ca)2Fe4 3+(PO4)4(OH)3·5H2O, a new phosphate species from Toms quarry, South Australia: Description and structural relationship to mélonjosephite
- Rate of antigorite dehydration at 2 GPa applied to subduction zones
- IR absorption coefficients for water in nominally anhydrous high-pressure minerals
- Experimental techniques for determining tin solubility in silicate melts using silica capsules in 1 atm furnaces and rhenium capsules in the piston cylinder
- Cassiterite-saturated minimum melting behavior within Sn-SnO2-SiO2 at 1 atm and 10 kbar
- Cr-bearing tourmaline associated with emerald deposits from Swat, NW Pakistan: Genesis and its exploration significance
- Mechanism and kinetics of reduction of a FeO-Fe2O3-CaO-MgO aluminosilicate melt in a high-CO-activity environment
- Biodurability of chrysotile and tremolite asbestos in simulated lung and gastric fluids
- High-pressure behavior of Ca/Na clinopyroxenes: The effect of divalent and trivalent 3d-transition elements
- Uvarovite from chromite-bearing ultramafic intrusives, Orissa, India, a crystal-chemical characterization using 57Fe Mössbauer spectroscopy
- An X-ray Rietveld and infrared spectral study of the Na2(Mn1–xM2+x )Fe2+Fe3+(PO4)3 (x = 0 to 1 and M2+ = Mg, Cd) alluaudite-type solid solutions
- Dissolution kinetics of anorthite in a supercritical CO2–water system
- Evaluation of the elasticity normal to the basal plane of non-expandable 2:1 phyllosilicate minerals by nanoindentation
- 57Fe Mössbauer spectroscopy and electrical resistivity studies on naturally occurring native iron under high pressures up to 9.1 GPa
- Letter. Discreditation of paraspurrite
- Letter. High-pressure magnetic transition in hcp-Fe
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- Letter. Akaogiite: An ultra-dense polymorph of TiO2 with the baddeleyite-type structure, in shocked garnet gneiss from the Ries Crater, Germany
