Effects of growth temperature and growth rate on polytypes in gold-catalyzed GaAs nanowires studied by in situ X-ray diffraction

Takahashi, Masamitsu; Kozu, Miwa*; Sasaki, Takuo

Japanese Journal of Applied Physics, 55(4S), p.04EJ04_1 - 04EJ04_4, 2016/04

https://doi.org/10.7567/JJAP.55.04EJ04

High-speed three-dimensional reciprocal-space mapping during molecular beam epitaxy growth of InGaAs

Hu, W.; Suzuki, Hidetoshi*; Sasaki, Takuo*; Kozu, Miwa*; Takahashi, Masamitsu

Journal of Applied Crystallography, 45(5), p.1046 - 1053, 2012/10

https://doi.org/10.1107/S0021889812036175

Physical Property Evaluation Testing of Cement-Solidified Products Prepared from Simulated Liquid Waste

Kubo, Yoshikazu*; Sasaki, Tadashi*

JNC TJ8430 2005-003, 91 Pages, 2005/02

JNC-TJ8430-2005-003.pdf:0.64MB

In the low level radioactive waste treatment facility (LWTF), the cement solidification process is being studied on its applicability as a method for preparing waste packages from sodium-nitrate-containing low-level liquid waste generated at reprocessing plants. Solidification of nitrate solution waste: Solidification in a high temperature caused a rapid hydration reaction of cement, resulting in rapid hardening during the mixing process and a drop in fluidity. However, it has been confirmed that liquid waste can be solidified at 80C or so by adding a dispersing agent to improve fluidity and changing the amount of hardening solution to be added for cement hardening. This has verified that the cement solidification process under contemplation is applicable to nitrate-containing liquid waste. Solidification of slurry waste: In solidifying slurry waste, a fall in fluidity and a fall in compressive strength were observed. It is considered that this is attributed to the effects of phosphate contained in the liquid waste. In the case of slurry waste whose phosphate concentration is adjusted to 0g/L, it has been verified that solidified products whose salt mixing ratio is 50wt% can be prepared when the liquid waste temperature is 80C and the degree of concentration is 65wt%. It has been revealed that increases in the NaNO, NaHCO, and NaSO contents cause a delay in cement hardening, a fall in compressive strength, and a fall in fluidity, respectively. It has also been revealed that when liquid waste containing phosphate alone is solidified, solidified products whose salt mixing ratio is 50wt% in terms of hydrate salt (NaPO 8HO) (26.6wt% in terms of anhydrate salt) can be prepared.

Experimental Evaluation of Cement Materials for Solidifying Sodium Nitrate

*; *; *; *

JNC TJ8430 2002-002, 61 Pages, 2003/02

JNC-TJ8430-2002-002.pdf:1.41MB

no abstracts in English

Crystal growth dynamics studied using in situ X-ray diffraction; Zero-, one- and two-dimensional structures

Takahashi, Masamitsu; Hu, W.; Kozu, Miwa*; Sasaki, Takuo*; Oshita, Yoshio*; Suzuki, Hidetoshi*

no journal, , 

Growth dynamics of semiconductor nanostructures ranging from quantum wells to quantum dots will be discussed on the basis of in situ X-ray diffraction. Experiments were performed using a molecular-beam epitaxy (MBE) chamber integrated with an X-ray difftactometer at 11XU of SPring-8. First, of all the nanostructures, quantum wells are playing the most important roles in technological applications today. For in situ study of growth of quantum wells, we have developed a real time X-ray technique enabling three-dimensional reciprocal space mapping during growth and applied it for the investigation of InGaAs growth on GaAs(001). Second, quantum wires are recently attracting much interest because of their extremely anisotropic one-dimensional shape. In this paper, we will present in situ X-ray diffraction data during the As-assisted vapor-liquid-solid growth of GaAs nanowires. Finally, the growth of quantum dots, which are the ultimate quantum structure, will be discussed as well.

In situ X-ray study on polytypism of Au-seeded GaAs nanowires grown by MBE

Takahashi, Masamitsu; Kozu, Miwa*; Sasaki, Takuo

no journal, ,