Conical support for double-stage diamond anvil apparatus. Issue 1 (2nd January 2020)

• Record Type: Journal Article
• Authors: Sakai, Takeshi; Yagi, Takehiko; Takeda, Ryosuke; Hamatani, Toshiki; Nakamoto, Yuki; Kadobayashi, Hirokazu; Mimori, Hideto; I. Kawaguchi, Saori; Hirao, Naohisa; Kuramochi, Keitaro; Ishimatsu, Naoki; Kunimoto, Takehiro; Ohfuji, Hiroaki; Ohishi, Yasuo; Irifune, Tetsuo; Shimizu, Katsuya
• Is Part Of: High pressure research. Volume 40:Issue 1(2020)
• Page Start: 12
• Page End: 21
• Publication Date: 2020-01-02
• Subjects: High pressure (Science) -- Periodicals; High pressure (Technology) -- Periodicals; 536.41
• DOI: 10.1080/08957959.2019.1691190
• Languages: English
• ISSNs: 0895-7959

Abstract

ABSTRACT: Both micro-paired and conical support type double-stage diamond anvil cells (ds-DAC) were tested using a newly synthesized ultra-fine nano-polycrystalline diamond (NPD). Well-focused X-ray sub-micron beam and the conically supported 2nd stage anvils (micro-anvils) with 10 μm culet enable us to obtain good quality X-ray diffraction peaks from the sample at around 400 GPa. The relationship between confining pressure and sample pressure depends heavily on the initial height (thickness) of micro-anvils, the difference of a few micrometers leads to a quite different compression path. The conical support type is a solution to retain both enough thickness and strength of micro-anvils at higher confining pressure conditions. All conical support ds-DAC experiments terminated by the failure of the 1st stage anvil instead of 2nd one. The combination of ultra-fine NPD 2nd stage anvil and NPD 1st stage anvil opens a new frontier for measurement of the X-ray absorption spectrum above 300 GPa.