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Wide-Surface Furnace for In Situ X-Ray Diffraction of Combinatorial Samples using a High-Throughput Approach
🤖 AI Summary
This study addresses the challenge of performing in situ structural characterization of large-format combinatorial material libraries under high-temperature and controlled-atmosphere conditions, which existing high-throughput techniques struggle to achieve. The authors developed a wide-bore furnace capable of accommodating full 100 mm silicon wafers, integrated with synchrotron-based X-ray diffraction (XRD) and X-ray fluorescence (XRF), enabling in situ high-throughput analysis up to 735 °C across atmospheres ranging from nitrogen to pure oxygen. Combined with ternary oxide libraries fabricated via pulsed laser deposition and a custom MATLAB-based thermal expansion analysis program, this platform enabled, for the first time, wafer-scale in situ XRD characterization under realistic processing conditions. The approach overcomes limitations of conventional sample stages and reveals the inadequacy of Vegard’s law in predicting lattice behavior within high-entropy oxide systems.
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📝 Abstract
The combinatorial approach applied to functional oxides has enabled the production of material libraries that formally contain infinite compositions. A complete ternary diagram can be obtained by pulsed laser deposition (PLD) on 100 mm silicon wafers. However, interest in such materials libraries is only meaningful if high-throughput characterization enables the information extraction from the as-deposited library in a reasonable time. While much commercial equipment allows for XY-resolved characterization at room temperature, very few sample holders have been made available to investigate structural, chemical, and functional properties at high temperatures in controlled atmospheres. In the present work, we present a furnace that enables the study of 100 mm wafers as a function of temperature. This furnace has a dome to control the atmosphere, typically varying from nitrogen gas to pure oxygen atmosphere with external control. We present the design of such a furnace and an example of X-ray diffraction (XRD) and fluorescence (XRF) measurements performed at the DiffAbs beamline of the SOLEIL synchrotron. We apply this high-throughput approach to a combinatorial library up to 735 {\textdegree}C in nitrogen and calculate the thermal expansion coefficients (TEC) of the ternary system using custom-made MATLAB codes. The TEC analysis revealed the potential limitations of Vegard's law in predicting lattice variations for high-entropy materials.
Problem
Research questions and friction points this paper is trying to address.
combinatorial materials
high-throughput characterization
in situ X-ray diffraction
high-temperature analysis
controlled atmosphere
Innovation
Methods, ideas, or system contributions that make the work stand out.
high-throughput characterization
in situ X-ray diffraction
combinatorial materials library
controlled-atmosphere furnace
thermal expansion coefficient
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