Abstract
Nano-polycrystalline diamond (NPD) [Irifune et al. (2003), Nature (London), 421, 599] has been used to obtain a glitch-free X-ray absorption spectrum under high pressure. In the case of conventional single-crystal diamond (SCD) anvils, glitches owing to Bragg diffraction from the anvils are superimposed on X-ray absorption spectra. The glitch has long been a serious problem for high-pressure research activities using X-ray spectroscopy because of the difficulties of its complete removal. It is demonstrated that NPD is one of the best candidate materials to overcome this problem. Here a glitch-free absorption spectrum using the NPD anvils over a wide energy range is shown. The advantage and capability of NPD anvils is discussed by a comparison of the glitch map with that of SCD anvils.
Highlights
Diamond is an ideal material for the anvils used in highpressure research activities using synchrotron radiation because of its hardness and low absorbance in the hard X-ray region
The most serious problem associated with X-ray spectroscopy under high pressure is Bragg diffraction from the diamond anvils
It is concluded that the use of the Nano-polycrystalline diamond (NPD) anvils is highly advantageous to X-ray spectroscopy under high pressure
Summary
Diamond is an ideal material for the anvils used in highpressure research activities using synchrotron radiation because of its hardness and low absorbance in the hard X-ray region. In a recent paper, Hong et al (2009) reported that glitches were removed from the EXAFS spectra at the Ge K-edge using an iterative algorithm based on repeated measurements over a small angular range of DAC orientation, e.g. within Æ 3 relative to the direction of the X-ray beam This procedure is time consuming and may be difficult in those energy regions where Bragg diffraction is frequently encountered. It is expected that the Bragg diffraction from NPD anvils provides a smooth background to the absorption spectrum in contrast to the glitches from SCD anvils This characteristic of the NPD anvils is suitable for the X-ray spectroscopic methodology under high pressure. It is concluded that the use of the NPD anvils is highly advantageous to X-ray spectroscopy under high pressure
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