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Anisotropic compression of edingtonite and thomsonite to 6 GPa at room temperature

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Polycrystalline samples of natural edingtonite (New Brunswick, Canada) and thomsonite (Oregon, USA) were studied up to 6 GPa using monochromatic synchrotron X-ray powder diffraction and a diamond-anvil cell with a methanol:ethanol:water mixture as a penetrating pressure-transmitting fluid. Unlike natrolite, previously studied under the same conditions, edingtonite and thomsonite do not show any apparent pressure-induced hydration (PIH) or phase transitions. All these fibrous zeolites are characterized by their anisotropic compressibilities, with the linear compressibilities of the fibrous chains (c-axis) being as small as one third of those perpendicular to the chains (a-, b-axes); for edingtonite, β0 a=0.0050(3) GPa−1, β0 b=0.0054(2) GPa−1, β0 c=0.0034(1) GPa−1; for thomsonite, β0 a= 0.0080(2) GPa−1, β0 b=0.0084(2) GPa−1, β0 c=0.0032(1) GPa−1. The pressure–volume data were fitted to a second-order Birch–Murnaghan equation of state using a fixed pressure derivative of 4. As a result of the 0000-type connectivity of the chains, the bulk modulus of edingtonite is found to be about 40% larger than that of thomsonite; KEDI 0=73(3) GPa, KTHO 0=52(1) GPa. Distance least-squares refinements were used to model the expected framework, following the observed linear compression behaviors. The chain-bridging T–O–T angle is proposed to be correlated with the different compressibilities across the chains in each framework type.

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This work was supported by an LDRD (Laboratory Directed Research and Development) from BNL (Pressure in Nanopores). J. Hriljac thanks the Royal Society. The authors thank Jeffrey Post of the National Museum of Natural History at the Smithsonian Institution for providing the mineral specimens, Jingzhu Hu of the Geophysical Laboratory of the Carnegie Institute for access to their ruby laser system at beamline X17C and Patrick Woodward of Ohio State University for collecting ambient pressure X-ray powder diffraction data. Research carried out in part at the NSLS at BNL is supported by the US DoE (DE-Ac02–98CH10886 for beamline X7A).

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Lee, Y., Hriljac, J., Studer, A. et al. Anisotropic compression of edingtonite and thomsonite to 6 GPa at room temperature. Phys Chem Minerals 31, 22–27 (2004).

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