New diamond anvil cell for single-crystal analysis

Abstract

A new diamond anvil cell was devised for the single-crystal structure analyses under high pressure. The cell is characterized by large single-crystal diamond plates, which are used for the windows and fixed on the table planes of diamond anvils. The diamond plate windows have great advantages for single-crystal diffractometry, such as low x-ray absorption, much higher pressures up to 50 GPa, no powder rings from the window, and wide 2θ-angle (2θ<70°). Great progress of the structure analyses could be made by the combination with synchrotron radiation (SR). The short wavelength of λ=0.407 72 Å (E=30.388 keV) of SR source with 8 GeV 100 mA at SPring-8 was used for the diffraction intensity measurement of SiO2 stishovite (rutile type). These advantages could measure the intensities of much higher order reflections and the precise electron density distribution as a function of pressure was discussed.

High-pressure crystallography

“…the anvils (Yamanaka, Fukuda et al, 2001), and perforated diamond anvils are made for reducing absorption in Mö ssbauer spectroscopy (Dadashev et al, 2001). For Mbar pressures (above 100 GPa), bevelled culets reduce the stress concentration on the culet edges (Mao & Bell, 1978;Seal, 1984).…”

Performance of a synthetic diamond backing-plate for the diamond-anvil cell at ultrahigh pressures

“…Yamanaka et al successfully used synthetic diamond as a backing-plate in single crystal x-ray diffraction experiments. 6 They have demonstrated that the diamond backing-plate is superior to the beryllium plate, since the diamond plate produces only a small number of Bragg reflections, while the polycrystalline beryllium plate produces strong powder diffraction rings, interfering with the sample reflections. The maximum pressure reported in their article was limited to 26 GPa, probably due to the large anvil size.…”

High pressure study and bonding analysis of

“…In a feasibility study it was shown that it is possible to obtain diffraction images with a comparable amount of information with and without DAC [1]. The change of the design of the DAC, in this case the replacement of polycrystalline Be by single-crystalline diamond further improved the obtainable quality of the data [2,3]. Mg 2 Co 3 Sn 10þx [4] was chosen for the present single-crystal hp study and bonding analysis, because of the following reasons:…”