In situ high temperature powder x-ray diffraction technique using a sapphire single-crystal flat cell

Area of Science:

• Materials Science and Engineering
• Solid-State Chemistry
• Analytical Chemistry

Background:

• Understanding material behavior in operational and manufacturing environments is crucial for industrial material design.
• High-temperature studies are essential for characterizing materials under extreme conditions.
• Existing methods may lack the capability to analyze materials under diverse gas atmospheres simultaneously.

Purpose of the Study:

• To develop and validate a novel high-temperature X-ray diffraction (XRD) system.
• To enable in situ analysis of materials under vacuum, oxidative, and reductive gas atmospheres up to 1400°C.
• To integrate gas analysis tools for comprehensive study of solid-gas interactions.

Main Methods:

• Development of a high-temperature XRD system utilizing a small microscope heating stage at the SPring-8 BL02B2 beamline.
• Design of specialized sapphire single-crystal sample cells for powdered samples.
• Integration of in situ gas analysis tools including a remote gas-pressure control system, gas chromatograph, and mass spectrometer.

Main Results:

• Successful operation of the XRD system under vacuum, air, inert gas (up to ~1400°C), and reduction gas flow (up to ~900°C).
• Demonstration of the system's capability to analyze gas-adsorption/desorption and solid-gas reaction processes.
• Validation through experiments including reduction of Fe oxides, phase transitions of ZrO2 and BaCO3, and synthesis of BaZrO3.

Conclusions:

• The developed high-temperature XRD system with integrated gas analysis is effective for studying material behaviors under diverse conditions.
• The system provides valuable insights into chemical reactions, phase transitions, and material synthesis.
• This technology advances the design and application of industrial materials by enabling detailed characterization.