Energy Dispersive X-Ray Spectroscopy (EDS/EDX)
Get precise elemental composition insights with Energy Dispersive X-Ray Spectroscopy (EDS/EDX). This advanced SEM-based technique enables rapid qualitative and semi-quantitative analysis, elemental mapping, and contamination detection across a wide range of materials for failure analysis, research, and quality control.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
EDS/EDX - Overview
Energy Dispersive X-Ray Spectroscopy (EDS) is an elemental analysis technique coupled with scanning electron microscopy (SEM) to identify and quantify the elemental composition of materials at the micro- and nanoscale. When a focused electron beam strikes the sample, characteristic X-rays are emitted from each element, and the EDS detector captures their energies to produce elemental spectra and maps.
EDS provides rapid, spatially resolved elemental information without the need for complex sample preparation, making it a cornerstone technique in materials science, failure analysis, and quality control.
Scope, Applications, and Benefits
Scope
Energy Dispersive X-ray Spectroscopy (EDS) is a powerful analytical technique used to determine the elemental composition and distribution within a material. It provides both qualitative and semi-quantitative insights for elements with atomic numbers greater than 4, making it highly effective for material characterisation and failure analysis.
Key capabilities of EDS include:
- Qualitative and semi-quantitative elemental analysis (Z > 4)
- Localised point analysis for precise compositional identification
- Line scans to evaluate elemental variation across a defined path
- 2D elemental mapping for spatial distribution visualisation
- Detection of surface and subsurface elemental distribution
- Identification of inclusions, phases, and contaminants within the sample
Applications
- Metals and alloy composition verification
- Coating and thin film elemental profiling
- Failure analysis and contamination identification
- Geological and mineralogical characterisation
- Semiconductor device defect analysis
Benefits
- Rapid elemental identification (seconds to minutes per point)
- Non-destructive analysis on SEM-prepared specimens
- Simultaneous multi-element detection
- Spatial resolution down to ~1 µm (beam dependent)
- Integrates seamlessly with SEM imaging workflows
EDS/EDX - Test Process
Sample Preparation
Mount, cross-section (if needed), and coat sample for conductivity.
1SEM Imaging
Capture ROI using SEM at suitable voltage (≈10–20 kV).
2X-Ray Acquisition
Collect characteristic X-rays; acquire spectra (30–300 s).
3Data Processing
Analyze spectra and quantify elements using correction models.
4EDS/EDX - Technical Specifications
| Parameter | Details |
|---|---|
| Test Principle | Characteristic X-ray emission under electron beam excitation |
| Detectable Elements | Boron (Z=5) to Uranium (Z=92) |
| Energy Resolution | ~125 eV (Si-drift detector) |
| Spatial Resolution | ~0.5–2 µm (material/voltage dependent) |
| Detection Limit | ~0.1–1 wt% |
Instrumentation Used for Testing
- SEM with integrated EDS detector (Si-drift detector)
- Carbon/gold sputter coater
- Elemental standards for quantification
- EDS analysis software (Oxford Aztec, Bruker Esprit, etc.)
- Energy calibration reference materials
Results and Deliverables
- Elemental spectra with peak identification
- Semi-quantitative elemental composition tables (wt% and at%)
- 2D elemental maps and line scan profiles
- Phase and inclusion identification
- Full analytical report with SEM micrographs
Frequently Asked Questions
EDS can detect elements from boron (Z=5) to uranium (Z=92). Light elements such as hydrogen, helium, and lithium cannot be detected as they do not produce characteristic X-rays of sufficient energy.
EDS provides semi-quantitative results with typical accuracy of ±1–2 wt% when using appropriate standards and matrix corrections (ZAF or φ(ρz)). For high-accuracy quantification, WDS (wavelength dispersive spectroscopy) is recommended.
EDS offers high spatial resolution at the micron scale, while XRF analyzes larger bulk areas (mm to cm). EDS is preferred for localized defect or phase analysis; XRF is better for bulk elemental screening.
Yes, but non-conductive materials require a thin conductive coating (carbon or gold) to prevent charge buildup during electron beam exposure that would otherwise distort imaging and spectral data.
EDS analyzes a micron-scale interaction volume, meaning it provides information from both the surface and shallow subsurface region.
Why Choose Infinita Lab
for Electron Energy Loss
Spectroscopy (EELS)?
At the core of this breadth is our network of 2,000+ accredited labs in the USA, offering access to over 10,000 test types. From advanced metrology (SEM, TEM, RBS, XPS) to mechanical, dielectric, environmental, and standardized ASTM/ISO testing, we give clients unmatched flexibility, specialization, and scale. You are not limited by geography, facility, or methodology – Infinita connects you to the right testing, every time.
Looking for a trusted partner for Electron Energy Loss Spectroscopy (EELS) Testing?
Send query us at hello@infinitlab.com or call us at (888) 878-3090 to learn more about our services and how we can support you.
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