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HOPG - highly oriented pyrolytic graphite
Applications
- Scanning tunneling microscopy-callibration and substrates
- Graphite Monochromators
- X-Ray diffraction
- Neutron scattering and diffraction
Physical Characteristics (at 300K)
| Spacing of Reflecting Planes (002): |
3.355 - 3.359 Å |
| Density: |
2.255 - 2.265 gem-3 |
Thermal Conductivity
Parallell (002):
Perpendicular (002): |
16 - 20 Watt/cm K
ca. 0.8 Watt/cm K |
Thermal Expansion
Parallell (002):
Perpendicular (002): |
Slightly negative
20 x 10-6 / K |
Electrical Resistivity
Parallell (002):
Perpendicular (002): |
3.5 - 4.5 x 10-5Ohm cm
0.15 - 0.25 Ohm cm |
1) Mosaic spread is the half maximum height peak width of the Cu-Ka
Products
HOPG plates are produced as flat, singly-bent and double-bent shapes. The
monochromators are classified according to mosaic spread.
| Grade |
Mosaic Spread |
Nominal thickness [mm]** |
Minimum* size [mm] |
Maximum* size [mm] |
| ZYA |
0.4° ± 0.1° |
2 |
12 x 12 |
50 x 50 |
| ZYB |
0.8° ± 0.2° |
2 |
12 x 12 |
50 x 75 |
| ZYD |
1.2° ± 0.2° |
2, 4 |
12 x 12 |
50 x 75 |
| ZYH |
3.5° ± 1.5° |
2, 4, 6, 8 |
12 x 12 |
75 x 75 |
* other sizes or specific mosaic spread on request
** Tolerance ± 0/-1 mm
Standard radii for singly-bent plates: 115, 225, 250, 510, 790, and 1.300 mm.
Standard size for bent monochromators (mm):
| 12 x 12, 20, 25, 40 |
20 x 20, 25, 40, 50 |
| 15 x 15, 25, 40, 50 |
25 x 25, 40, 50, 75 |
Thickness for bent plates 2 + 0/-1 mm.
Other sizes and specifications on request
© 1996 - 2008 MaTecK GmbH - Im Langenbroich 20 - D-52428 Juelich - phone: +49 (0) 2461 / 9352-0 - fax: +49 (0) 2461 / 9352-11 - Contact: info@mateck.de
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