Please use this identifier to cite or link to this item:
Title: Large volume cell for in situ neutron diffraction studies of hydrothermal crystallizations
Authors: Xia, F
Qian, G
Brugger, J
Studer, AJ
Olsen, SR
Pring, A
Keywords: Neutron diffraction
Phase transformations
Hydrothermal systems
Heat transfer
Issue Date: Oct-2010
Publisher: American Institute of Physics
Citation: Xia, F., Qian, G., Brugger, J., Studer, A., Olsen, S., & Pring, A. (2010). Large volume cell for in situ neutron diffraction studies of hydrothermal crystallizations. Review of Scientific Instruments, 81(10), 105107. doi;10.1063/1.3484281
Abstract: A hydrothermal cell with 320 ml internal volume has been designed and constructed for in situ neutron diffraction studies of hydrothermal crystallizations. The cell design adopts a dumbbell configuration assembled with standard commercial stainless steel components and a zero-scattering Ti–Zr alloy sample compartment. The fluid movement and heat transfer are simply driven by natural convection due to the natural temperature gradient along the fluid path, so that the temperature at the sample compartment can be stably sustained by heating the fluid in the bottom fluid reservoir. The cell can operate at temperatures up to 300 °C and pressures up to 90 bars and is suitable for studying reactions requiring a large volume of hydrothermal fluid to damp out the negative effect from the change of fluid composition during the course of the reactions. The capability of the cell was demonstrated by a hydrothermal phase transformation investigation from leucite (KAlSi2O6) to analcime (NaAlSi2O6⋅H2O) at 210 °C on the high intensity powder diffractometer Wombat in ANSTO. The kinetics of the transformation has been resolved by collecting diffraction patterns every 10 min followed by Rietveld quantitative phase analysis. The classical Avrami/Arrhenius analysis gives an activation energy of 82.3±1.1 kJ mol−1. Estimations of the reaction rate under natural environments by extrapolations agree well with petrological observations. © 2010, American Institute of Physics
Gov't Doc #: 3053
ISSN: 0034-6748
Appears in Collections:Journal Articles

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.