A Novel Strategy for Synthesizing Matrix-Matched Microanalysis Reference Materials via Hydrothermal Precursors and...

Area of Science:

• Geochemistry
• Materials Science
• Analytical Chemistry

Background:

• Secondary-ion mass spectrometry (SIMS) enables precise microscale chemical and isotopic analysis.
• Quantitative accuracy in SIMS is hindered by matrix effects causing instrumental mass fractionation (IMF).
• Matrix-matched reference materials (RMs) are crucial for accurate SIMS quantification but natural RMs often lack homogeneity.

Purpose of the Study:

• To develop a novel synthesis strategy for producing matrix-matched synthetic pyrite (FeS2) reference materials for SIMS.
• To overcome challenges in creating synthetic RMs sensitive to microstructural attributes like surface smoothness and grain size.
• To improve analytical accuracy and interlaboratory comparability in microanalytical science.

Main Methods:

• Combined hydrothermal precursor synthesis with low-temperature ultrahigh-pressure (UHP) sintering.
• Fabricated dense, nanocrystalline pyrite ceramics with controlled stoichiometry.
• Evaluated material properties and sputtering behavior for SIMS applications.

Main Results:

• Successfully produced synthetic pyrite ceramics with exceptional sulfur-isotope homogeneity.
• The synthetic pyrite exhibited sputtering behavior indistinguishable from natural pyrite.
• Demonstrated a robust framework for producing synthetic sulfide RMs.

Conclusions:

• The novel synthesis strategy provides a reliable method for creating matrix-matched synthetic sulfide reference materials.
• This approach significantly enhances analytical accuracy and reproducibility in SIMS.
• The methodology can be extended to develop synthetic RMs for other mineral systems.