Ceramics Products

Carbide Coatings

Extreme thermal stability and chemical resistance

Made of highly-oriented forms of high-purity pyrolytic graphite, Momentive Technologies graphite monochromators are shown to diffract X-rays and neutrons with greater efficiency than any other competitive material. Offering the lowest mosaic spread available, Momentive Technologies HOPG materials are excellent for beam conditioning in neutron and x-ray crystal-based optics as monochromators, analyzers or filters.

Features and Benefits

  • Ultra-high purity completely prevents unwanted absorption of X-ray and neutron beams
  • Lowest mosaic spread allows the narrowest wavelength range selections for X-ray and neutron beams
  • Single-bent focusing monochromators using graphite (in testing) have shown yields up to 3X more than lithium fluoride at equivalent resolution

Crystals can be customized for specific mosaic spread ranges, sizes and geometries (flat, single-bent and double-bent shapes) to meet any application requirements, and our Momentive Technologies engineering experts can custom design solutions for specific or unique applications.

Highly-Oriented Pyrolytic Graphite (HOPG)

Potential Applications

  • X-ray diffraction
  • Neutron scattering and diffraction
  • Scanning tunneling microscopy for calibration and substrates

Physical Properties of HOPG at 300K

d-spacing (002) (A}
3.355-3.359
Density (g/cm3}
2.255-2.265
// (002)
1 (002)
Thermal Conductivity (W /m·K)
1600-2000
80
Thermal Expansion (10-6 /°C}
-1
20
Electrical Resistivity (ohm·cm}
3.5-4.5x10-5
0.15-0.25
Typical values.

HOPG Standard Grades and Dimensions

Grade X-ray mosaic spread (°) Maximum size (mm)
ZYA-N
0.35-0.45
50X75, 60x60
ZYA
0.3-0.5
6
50X75, 60x60
ZYB-N
0.55-0.75
6
50X75, 60x60
ZYB
0.5-1.0
6
50X75, 60x60
ZYH
1.0-5.0
12
60x80, 75X75
Typical values.

The information provided in these charts is for informational purposes only. It is not a product or material recommendation and it is shared with you on the express condition that you will use your own expertise and professional judgment in applying any information to a specific use case or need. This is general information only, the validity of which may be affected by individual factors that are unknown to Momentive Technologies. It is the responsibility of those using this information to ensure appropriate interpretation and application is undertaken with regards to any specific situation.

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Highly-Oriented Pyrolytic Graphite (HOPG)

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