Small- and Wide-Angle X-ray Scattering under High Pressures and Low Temperatures at the 23A SWAXS Endstation of NSRRC
Po-Chang Lin (林伯璋)1, Po-Wei Yang (楊博偉)2, Shih-Chang Weng (翁世璋)1, Jenn-Min Lee (李振民)1, Ching-Che Kao (高慶哲)1, Jey-Jau Lee (李之釗)1, Jin-Ming Chen (陳錦明)1, Wei-Ru Wu (吳瑋儒)1, Chun-Jen Su (蘇群仁)1, Yi-Qi Yeh (葉奕琪)1, Kuei-Fen Liao (廖桂芬)1, U-Ser Jeng (鄭有舜)1,3*
1National Synchrotron Radiation Research Center, Hsinchu, Taiwan
2Department of Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan
3Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan
* presenting author:Po-Chang Lin,
A high-pressure/low-temperature (HPLT) system has been installed to the 23A SWAXS endstation of the National Synchrotron Radiation Research Center (NSRRC). Samples can be sealed in diamond anvil cell (DAC), Almax Easylab Diacell® Bragg-LT(G)Plus, for pressures ranging from P = 0.1 to 2 GPa or 1 GPa to 23 GPa, depending the DAC setting. Argon or nitrogen, of excellent hydrostatic pressure at low temperature, is selectively sealed within the DAC as sample pressure medium. The sample-DAC placed inside a cryostat (Janis PTSHI-950-5) can then be cooled between room temp and T=~10 K at selected pressures for mapping of P-T dependent structural phases. These P-T combination controls are achieved via a membrane pressing system and a pressure reading system with Raman spectroscopy based on ruby photoluminescence. With a Pilatus 1M-F (133 Hz) for SAXS and a flat panel area detector CMOS-9728DK (3.3 Hz) for WAXS, the integrated system can perform simultaneous SAXS/WAXS for samples under high pressures and low temperatures, in the q-range of 0.003 - 0.3 Å in SAXS and 0.5 - 4 Å in WAXS. The performance of the HPLT/SAXS/WAXS is illustrated with the preliminary results obtained for several sample systems of corn/rice starches, composites of superconductor, and nanoparticles.

Keywords: High Pressure, Low Temperature, DAC, Pressure Medium, SAXS