高定向热解石墨 HOPG(Highly Oriented Pyrolytic Graphite)是一种新型高纯度碳,是热解石墨经高温高压处理后制得的一种新型石墨材料,其性能接近单晶石墨。主要应用包括X射线单色器、中子滤波器和单色器、石墨基本性能研究、大尺寸石墨层间化合物基本研究等。为显微分析人员提供了一种可重复使用的平滑表面。与云母不同的是,高定向热解石墨(HOPG)完全无极性适用于元素分析,并且分析信号中仅有碳原子背景信号。高定向热解石墨(HOPG)优良的表面光滑性使其可以作为空白背景,除非分辨率达到原子级水平。
扫描隧道显微镜-校准及衬底
石墨单色仪
X射线衍射
中子散射和衍射
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
高定向热解石墨HOPG板材生产为扁平,单弯曲和双弯曲形状。该单色器根据马赛克传播进行分类。
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.