Autoclave Chamber - In-situ XRD experiments under hydrothermal conditions

A newly developed autoclave chamber has been applied for use in in-situ X-ray diffraction studies in Bragg-Brentano geometry. Quartz dissolution and tobermorite formation are monitored under hydrothermal conditions on a conventional laboratory diffractometer.

1 Introduction

Until now in-situ X-ray diffraction measurements of hydrothermalreactions have only been possible in transmission geometry. Such transmission cells have been used at synchrotron beamlines to study the formation of tobermorite or other calcium silicate hydrates most frequently at saturated vapor temperatures of 463 K. The transmission cells have been made by modification of standard laboratory autoclaves.

As synchrotron beamtime is limited and such experiments can take up to 14 hours, an autoclave chamber was developed by Anton Paar GmbH to make in-situ monitoring of hydrothermal reactions in reflection geometry with conventional laboratory X-ray diffractometers possible.

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