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Choi, Y.N.,Sungil Park, J.M.,Strassle, T.,Yeon, S.H.,Park, Y.,Lee, H. Pergamon Press ; Elsevier Science Ltd 2010 International journal of hydrogen energy Vol.35 No.23
We have studied the dynamics of the H<SUB>2</SUB> loaded THF (tetrahydrofuran) clathrate hydrate by using an inelastic neutron scattering technique. At 2K, a well defined single peak indicative of the ortho (J=1) to para (J=0) hydrogen transition is observed at 13.6meV. The neutron spectrum undergoes two distinct changes as the temperature increases. First, additional peaks appear from splitting of the rotational transition above 10K. Upon further heating, a quasi-elastic neutron scattering (QENS) signal due to hydrogen molecular diffusion through the THF hydrate crystalline lattice grows significantly above 65K. These results indicate that H<SUB>2</SUB> molecules trapped inside the THF hydrate crystalline structure undergo two distinct transformations in their dynamical behavior.
Park, Garam,Oh, In-Hwan,Park, J.M. Sungil,Park, Seong-Hun,Hong, Chang Seop,Lee, Kwang-Sei Elsevier 2018 PHYSICA B-CONDENSED MATTER - Vol.551 No.-
<P><B>Abstract</B></P> <P>In previous work, the inorganic-organic hybrid perovskite system (C<SUB>6</SUB>H<SUB>5</SUB>CH<SUB>2</SUB>CH<SUB>2</SUB>NH<SUB>3</SUB>)<SUB>2</SUB>MnCl<SUB>4</SUB> exhibit well-isolated 2D Heisenberg antiferromagnetc properties, including a canted antiferromagnet below T<SUB>N</SUB> = 44.3 K. This study looked at the antiferromagnetic spin structure of the titled compound using single-crystal neutron diffraction. At 43 K, a new forbidden (−1 0 0) peak was observed and this peak showed a clear temperature dependence. Additionally, non-integer forbidden peaks were found. It was assumed that the magnetic cell was equal to the chemical cell for Mn-PEA system (<I>k</I> = 0). No magnetic peaks were observed along the c-axis. From this data it can be assumed that the spin is parallel to the <I>c</I>-axis. This result coincides with previous magnetic measurement studies. According to Turov, in the case of an antiferromagnetic structure with weak ferromagnetism, the magnetic cell should be equal to the chemical cell. Our neutron diffraction measurement and former study strongly support the hypothesis of Turov.</P>
OPPORTUNITIES AND CHALLENGES OF NEUTRON SCIENCE AND TECHNOLOGY IN KOREA
KYE HONG LEE,J. M. SUNGIL PARK,HARK-RHO KIM,BYUNG JIN JUN,YOUNG-JIN KIM,JAE-JOO HA,김만원,최성민 한국원자력학회 2009 Nuclear Engineering and Technology Vol.41 No.4
Neutron science and technology, the utilization of neutron beams for a wide variety of scientific and engineering research ranging from materials and life science to industrial applications, has been one of the key elements of modern science and technology. Currently, the neutron science and technology in Korea is in rapid growth with the operation of the 30 MW High-flux Advanced Neutron Application Reactor (HANARO) at the Korea Atomic Energy Research Institute, which is one of the most powerful nuclear research reactors in the world. Furthermore, a state of the art HANARO cold neutron research facility, which will open a new era for the neutron science and technology in Korea, is expected to become available in 2010. In this paper, the progress of neutron science and technology in Korea is reviewed and its unprecedented new opportunities and challenges in coming years are presented.