Oxygen/Nitrogen Determination in Nitrides

Importance of Oxygen and Nitrogen Determination

Oxygen and nitrogen content in nitrides critically impacts material purity, mechanical properties and performance in industrial and research contexts. Reliable quantification supports quality control, material grading and contamination assessment in ceramics, coatings and semiconductor applications.

Study Objectives and Overview

This application note from LECO Corporation presents a rapid and direct approach for measuring oxygen and nitrogen in silicon nitride Si3N4, titanium nitride TiN and boron nitride BN powders. The primary aim is to define analytical parameters, calibration routines and expected performance metrics for routine quality analysis.

Methodology and Instrumentation

Samples of 0.02 to 0.06 g are weighed into tin capsules, combined with graphite powder and placed in graphite crucibles. The assembly is introduced into a TC600 combustion furnace configured in semi-automatic mode. The outgas and analysis power settings are calibrated to ensure complete fusion and gas release. Oxygen is detected by infrared absorption following reaction with carbon, while nitrogen is measured via thermal conductivity or infrared detection.
Instrumentation

• LECO TC600 and TCH600 combustion analyzers
• Graphite crucibles and 501-059 tin capsules
• 502-344 nickel sample baskets
• 501-073 high-purity graphite powder additive

Key Results and Discussion

Calibration using NIST SRM 8983 silicon nitride (1.20 percent O and 39.23 percent N) demonstrated precision better than 0.02 percent for oxygen and 0.5 percent for nitrogen. Analysis of Si3N4, BN and TiN samples yielded results in close agreement with theoretical stoichiometric values, confirming both accuracy and repeatability of the method.

Benefits and Practical Applications

• Fast, semi-automated analysis suitable for high-throughput quality control laboratories
• Minimal sample preparation without acid digestion
• Applicability to diverse nitride materials and potential for on-line process monitoring

Future Trends and Potential Uses

Future developments may include integration with robotic sample handling, extension of detection limits for trace impurities and coupling with chemometric algorithms for real-time process control. Emerging applications could involve advanced nitride composites and ceramics in aerospace, biomedical and electronic industries.

Conclusion

The described combustion method provides a robust, precise and efficient workflow for determining oxygen and nitrogen in nitrides. Adoption of this technique supports stringent material specifications, contamination control and informed decision making in both research and industrial settings.

Reference

NIST SRM 8983 Silicon Nitride
LECO Corporation Form No 203-821-370 July 2009