HOPG - highly oriented pyrolytic graphite

Wir sind führender Hersteller und Lieferant von Forschungsmaterialien

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: 2.26 g/cm3
Specific Heat: 0.71 J/g.K
Thermal Conductivity
   Parallell (002):
   Perpendicular (002):
1700 ± 100 W/m.K
ca. 8 W/m.K
Thermal Expansion
   Parallell (002):
   Perpendicular (002):
-(1 ± 0.1) x 10-6 /K (slightly negative!)
(26 ± 0.5) x 10-6 /K
Electrical Conductivity
   Parallell (002):
   Perpendicular (002):
(2.3 ± 0.1) x 106 /Ω.m
ca. 0.5 x 103 /Ω.m

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.

 

GradeMosaic SpreadNominal 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


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