Controlled sample environment for studying solid-gas interactions by in situ powder X-ray diffraction

Area of Science:

• Materials Science
• Crystallography
• Physical Chemistry

Background:

• Powder X-ray diffraction (PXRD) is a crucial technique for characterizing crystalline materials.
• In situ studies under varying pressure and temperature conditions provide critical insights into material behavior and phase transitions.
• Existing sample cells may have limitations in pressure range, temperature control, or portability.

Purpose of the Study:

• To demonstrate a novel sample cell for powder X-ray diffraction (PXRD) studies.
• To enable simultaneous in situ application of pressure and precise temperature control.
• To develop a portable system adaptable for both laboratory and synchrotron X-ray diffraction.

Main Methods:

• The sample cell utilizes a glass or quartz capillary housed within a Swagelok weld gland, capable of withstanding pressures up to 100 bar.
• Temperature control is achieved via a copper plate in contact with the sample, regulated between -30°C and 200°C using Peltier elements, heat cartridges, and a circulating bath.
• The system was commissioned using a custom-made small/wide-angle X-ray diffractometer.

Main Results:

• The developed sample cell successfully integrates in situ pressure application and precise temperature control for PXRD.
• The temperature control system demonstrated reliable performance within the specified range (-30°C to 200°C).
• Commissioning tests confirmed the functionality and performance of the cell on a laboratory diffractometer.

Conclusions:

• The demonstrated sample cell offers a robust and versatile platform for in situ PXRD studies under combined pressure and temperature.
• The system's portability and adaptability make it suitable for diverse research environments, including synchrotron radiation sources.
• This development facilitates advanced materials characterization and the investigation of pressure- and temperature-dependent phenomena.