Accuracy evaluation in temperature-dependent EXAFS measurements of CdTe

Area of Science:

• Materials Science
• Condensed Matter Physics
• Analytical Chemistry

Background:

• Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy is a powerful technique for probing local atomic environments.
• Accurate characterization of temperature-dependent properties is crucial for understanding material behavior.
• Uncertainty quantification in EXAFS is essential for reliable data interpretation.

Purpose of the Study:

• To evaluate and discuss the uncertainty in temperature-dependent EXAFS measurements.
• To analyze nearest-neighbor parameters, including thermal expansion and mean-square relative displacements.
• To compare experimental EXAFS data with theoretical models for Cadmium Telluride (CdTe).

Main Methods:

• EXAFS measurements were performed at Cadmium (Cd) and Tellurium (Te) K-edges.
• Experiments were conducted across a temperature range of 5 to 300 K.
• Data analysis focused on bond thermal expansion, mean-square relative displacements, and the third cumulant.

Main Results:

• Identified and discussed various sources contributing to uncertainty in EXAFS measurements.
• Compared experimental results with established theoretical models.
• Analyzed the differences between EXAFS and crystallographic thermal expansions.

Conclusions:

• The study provides a comprehensive evaluation of uncertainty in temperature-dependent EXAFS.
• Understanding the third cumulant is key to interpreting EXAFS data accurately.
• This work enhances the reliability of EXAFS for studying materials like CdTe.