The highest pressures achieved to date in a Moissanite anvil cell was 58.7 GPa (c.f. Xu J and Mao H K 2000 Science 290, 783 and Xu J, Mao H K, Hemley R J and Hines E 2002 J. Phys.: Condens. Matter 14)
The Gem Anvil Cell: high-pressure behaviour of diamond and related materials (Ji-An Xu, Ho-Kwang Mao and Russel J. Hemley, J. Phys.: Condens. Matter 14, 11549 (2002))
The moissanite anvil cell has been used to study the high-pressure behaviour of diamond. The first-order Raman shift of diamond shows a strong dependence on hydrostaticity, with very different pressure dependences observed under hydrostatic and non-hydrostatic conditions. The shift of the second-order Raman band under hydrostatic pressures was determined for the first time. Sapphire has almost no peaks above 1000 cm−1 in the Raman spectrum and no absorption in the ultraviolet range; it is therefore especially useful for studies in those spectral regions. A sapphire anvil cell was used in a study of graphite up to 24 GPa. A phase transition was found near 18 GPa, consistent with previous reports, and no peaks characteristic of diamond in the 1330 cm−1 range were found, indicating that the phase is not diamond.
FTIR Spectra of faceted diamonds and diamond simulants (Pimthing Thongnopkun, Sanong Ekgasit, Diamond and Related Materials 14, 1592 (2005))
FTIR spectra of faceted diamonds and diamond simulants collected by diffuse reflectance, transflectance, and specular reflection techniques were compared. The transflectance technique exploited total internal reflection phenomenon within the faceted diamond for the spectral acquisition. The transflectance spectra were similar to the well-accepted diffuse reflectance spectra with equal or better spectral qualities. Based on the observed spectral features of the faceted diamond, classification of the diamond, determination of defects, impurities, and treatment process (i.e., irradiation and high pressure and high temperature) can be performed.
We have compiled a series of technical documents (brochures, articles, technical drawings, …) which you might find useful to help you understand this product better.
2003 – Bisschop, J. et al. – Deforming quartz in the diamond anvil cell
2004 – Xu, J. et al. – Large volume high-pressure cell with supported moissanite anvils
2016 – Pugh, E. – Note: Moissanite backing plates for use in diamond anvil high pressure cells
How to chose the culet size ?
The culet size is to be decided as a function of the maximum pressure or the sample size. Typical sample space is given by the gasket thickness (typically 0.10 mm or less) and the central hole diameter (typically 30-50% culet size)
|Pmax (GPa) (*)
|Culet size (mm)
||< 0.20 mm, bevels up to 0.30 mm at 8°
(*) The Pmax values are only indicative. The maximum pressure achievable with a DAC is influenced by many others experimental parameters, like the gasket characteristics (material, thickness and hole size) or the pressure transmitting medium.
How the culet looks like?
||Culet with single bevel
Examples of typical requests for quote:
Moissanite anvil, Standard design, round, 3.50 mm, culet of 0.50 mm
- Article nr.: P01100
- Quantity: 6 anvils.
Moissanite anvil, Standard design, round, 4.80 mm, culet of 0.20 mm, bevels up to 0.30 at 8°
- Article nr.: P01105
- Quantity: 4 anvils.