ARL EQUINOX LAUE XRD for Large Single Crystals Orientation

At present, the Laue method is mostly utilized to identify the crystallographic orientation of fixed single crystals or wafers.

Unlike a conventional powder diffraction experiment in Laue diffraction, white Bremsstrahlung is used instead of monochromatic radiation. A 2D detector captures the signals that show up as arched arrays of reflections.

X-rays are diffracted by each set of lattice planes with a wavelength that obeys Bragg’s law. The use of white Bremsstrahlung makes the wavelength of the diffracted radiation unknown for each set of reflections; therefore, indexing of the signals becomes challenging.

Back-Reflection Laue Method

In the back-reflection technique, the 2D detector is positioned between the crystal and the X-ray source. The backward diffracted radiation is detected when it intersects the detector.

The cone of Laue reflections is defined by the converted beam, where the cone usually looks like a hyperbolic shape upon intersecting the detector.

Schematic diagram of a diffraction assembly by the Laue method Thermo Scientific ARL EQUINOX LAUE.

Schematic diagram of a diffraction assembly by the Laue method Thermo Scientific ARL EQUINOX LAUE.

Features

The Thermo Scientific™ ARL™ EQUINOX LAUE X-ray diffractometer (XRD) is an economical solution to fulfill all needs in both academic and industrial research laboratories, as well as QA/QC or operations facilities.

  • Complete 3-kW power instrument, W or Mo wavelength
  • Motorized sample positioning
  • Back-reflection 2D camera
  • Sample positioning by a camera
  • Built-in beam collimation
  • The manually operated goniometer head can be directly transferred to a wire saw

ARL EQUINOX 5000 XRD for High-Level Research Applications

Camera Specifications

The high-resolution Thermo Scientific™ ARL™ EQUINOX LAUE camera can be used to record digital Laue diffraction pattern with 14-bit digitization and a resolution of 2774 x 1843 pixels.

The X-ray beam that passes through the camera is collimated. The active area input dimension is analogous to that of a Polaroid film, which is 156 mm x 104.4 mm. At the time of crystal orientations, exposures from a few seconds up to >30 minutes can be tuned, before being cut for example.

Applications Fields

The ARL™ EQUINOX LAUE is a flexible XRD instrument that can be used for determining crystal orientation such as wafer, ingots, jewelry, precious stones, turbine blades, etc.

Examples of crystals: Al2O3, KTP, YAG, CdTe, Tungsten, Quartz, LiF, CaF2, etc.

  • High-intensity white radiation enables rapid data acquisition
  • Quick collection of Laue patterns of separate crystals
  • High information density in Laue pattern achieved through multi-diffraction
  • High-energy radiation results in large measured volume owing to high penetration depth

Thermo Scientific™ ARL™ EQUINOX LAUE.

Thermo Scientific™ ARL™ EQUINOX LAUE.

Diamond Crystal

  • This diamond crystal is a piece of cut fashion jewelry (measuring a few cubic millimeters).
  • The dots are well-defined and the orientation is (111).

ARL EQUINOX 5000 XRD for High-Level Research Applications

Diamond on Earring

  • With the help of a video camera, it is feasible to adjust a crystal and then measure it in Laue XRD. The size of the gem is approximately 2 mm.
  • The Laue pattern depicts the (100) axis of the diamond, illustrated by the four-fold symmetry.

ARL EQUINOX 5000 XRD for High-Level Research Applications

Fluorine Crystal

  • A fluorine crystal (employed for laser emission) is produced and placed on a goniometer head, which is compatible with the ARL™ EQUINOX LAUE and a wire saw.
  • Thus, after accurately identifying the (111) direction through Laue measurements, direct cutting of the crystal can be performed.

ARL EQUINOX 5000 XRD for High-Level Research Applications

Quartz Resonator

  • The electrical contacts are visible on each side of the image. The crosshair denotes the place of the X-ray beam.
  • A quartz resonator is a single crystal that can vibrate along a crystallographic axis when an oscillating voltage is applied.

ARL EQUINOX 5000 XRD for High-Level Research Applications

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