問い合わせ番号

INS-0000001664

High pressure PDF diffractometer

 This apparatus enables in situ Pair Distribution Function (PDF) analysis of liquids and amorphous materials under high-temperature and high-pressure conditions using the Paris-Edinburgh press, with a maximum load of 130 tons. The apparatus was developed under the SACLA/SPring-8 basic development program ("Development of pair distribution function measurement of liquids and amorphous materials under high pressure and high temperature conditions", PI: Prof. Yoshio KONO of Kwansei Gakuin University). To reduce diffraction and background noise from high-pressure cell surrounding the sample, a point detector and double-slit system are employed in the diffractometer. It is capable of collecting data over a wide Q range ( = 0.4-28ň{-1}), allowing for high real space resolution in PDF analysis.

X-ray detectors

 Two detectors are employed: one CdTe Diode detector and one Ge-SSD. They are positioned at 15-degree intervals to reduce measurement time. By adjusting the widths of the incident slit and the first detector slit according to the 2θ angle, efficient measurements can be achieved.
CdTe semiconductor detector: X-123CdTe, Amptek
Ge semiconductor detector: GL0515, MIRION TECHNOLOGIES

High pressure apparatus

The Paris-Edinburgh press can be installed at the diffraction center of the diffractometer, enabling in situ PDF measurement under high-pressure conditions. Furthermore, by placing a heating element inside the high-pressure cell, high-temperature experiments using resistive heating can also be conducted. Pressure generation up to 10 GPa at room temperature and up to 7 GPa at high temperatures (<2,000 K) is achievable. The Paris-Edinburgh press is mounted on an XYZ stage independent of the diffractometer, allowing measurements at arbitrary sample positions. Typical sample dimensions are 1.0–1.5 mm in diameter and 0.5–1.5 mm in height.

Reference

[1] Y. Kono, K. Ohara, N.M. Kondo, Y. Higo, S. Kakizawa, H. Yumoto, T. Koyama, H. Yamazaki, Y. Senba, H. Ohashi, I. Inoue, Y. Hayashi, and M. Yabashi (2024), In situ high-pressure pair distribution function measurement of liquid and glass by using 100 keV pink beam, Review of Scientific Instruments, 95, 013904. doi: https://doi.org/10.1063/5.0176975

CONTACT INFORMATION

Please note that each e-mail address is followed by "@spring8.or.jp."

Sho KAKIZAWA
SPring-8 / JASRI
1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198
Phone : +81-(0) 50-3496-9137
FAX : +81-(0)791-58-0830
e-mail : kakizawa

Yuji HIGO
SPring-8 / JASRI
1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198
Phone : +81-(0) 50-3502-3587
FAX : +81-(0)791-58-0830
e-mail : higo