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EMPA

EMPA

 The JEOL JXA-8200 Superprobe in our institute is a high resolution SEM and a WD/ED Combined Electron Probe Microanalyzer (EPMA). The Electron gun consists of a tungsten cathode. Five wavelength dispersive X-ray spectrometers (WDS) and an energy dispersive X-ray spectrometer (EDS) gives the possibility of efficient and accurate analysis. The WDX spectrometers are able to analyse all elements Z > 3 with different crystals (LIF, PET, TAP) and LDE1, LDE2, LDEB for light elements (Be, B, C, N, O, F). In addition one can observed specimens with a visible-light microscope (reflected and transmitted light). This equipment allows to determine the chemical composition of different samples.
The high-speed large specimen stage (HSLSS XM-81010) belongs to the Electron Probe Microanalyzer can handle samples up to 9 x 9 x 2 cm (L x B x H) through the airlock, and can reposition a sample to less than 0.5um.

Jeol Superprobe with 5 Spectrometers and EDX system

Configuration of Spectrometers and diffraction crystals of the Electron Probe Microanalyzer JXA-8200 (according to A. Kronz)

Sputtering- and Coating Device MED 020, Co. BAL-TEC

Specimen Stage (including standard materials) with specimen holder for thin- and thick sections

Grinding- and Polishing Device RotoPol-22 Co. STRUERS for thick and thin sections

 

The Electron Probe Microanalyzer JEOL JXA-8200 has the following specifications, parameters and capabilities:

  • Five wavelength-dispersive spectrometers (WDS):
  • Detectable element range: 4-Be to 92-U (all elements with Z > 3).
  • Eight crystal types: TAP, PETJ, PETH, LDE1, LDE2, LDEB, LIF, and LIFH.
  • Layered dispersive elements, gas-flow detectors allow light-element analyses.
  • One energy-dispersive spectrometer (EDS):

Solid-state Si(Li) detector, liquid-nitrogen cooled, Ultrathin detector window.

  • Secondary-electron (SE) and backscattered-electron (BSE) imaging:
  • SE image resolution: 6 nanometers (at 30 kV accelerating voltage; 11 mm WD).
  • BSE image modes: composition (sum) and topography (difference).
  • Multi-element line analyses and area maps
  • Matrix corrections using ZAF.
  • High-speed large specimen stage (HSLSS XM-81010):

Maximum sample size: 100 x 100 x 50 mm (H).

Maximum analysable area: 90 x 90 mm.

  • Accelerating voltage: 0.2 to 30 kV (0.1 kV steps).
  • Electron probe current range: 10-12 to 10-5 A
  • Electron probe current stability: ± 0.5 x 10-3/h; ± 3 x 10-3/12h
  • Integrated visible-light microscopy: transmitted and reflected light