Resume
Name: In-Hwan OH
Material Status: married
Present
Address : Jaeger Str.22a, D-52066, Aachen, Germany
Date of
Birth : 04.Aug. 1969
Home Phone :
+49-241-9970880
02.1988
Whimoon Highschool in Korea
03.1988-02.1992
Korea University with a Bachelor’s degree (Major : Geology)
03.1992-02.1994
Korea University with a Master’s degree ( Major : Petrology)
Master Thesis :
Metamorphism of Ogchon methmorphic rocks in the Kumsan area, Korea(Advisor :
Prof. Kim Hyung-Shik)
1998-2001 RWTH Aachen in Germany (Major : Crystallography)
Diplom Work : Polymorphie von Tl(H,D)2PO4 (Polymorphy
of Tl(H,D)2PO4)(Advisor :
Prof. Gernot Heger)
2001-2005 Dr. rer.nat.
Dissertation : Strukturelle Phasenübergänge in TlH2PO4 und Rb0.7Tl0.3PO4 und Kristallstrukturen von Rb0.5Tl0.5PO4
(Structural phase transitons in TlH2PO4 and crystal structures of Rb0.7Tl0.3PO4 and Rb0.5Tl0.5PO4 )
(Advisor : Prof. Gernot Heger)
Funded by DFG (German Research Foundation)- Project under “structural gradient”
(DFG (German Research Foundation)-Project)
03.1992-02.1994
Research Assistant, The Institute of Basic Science at the Korea University in
Korea
05.1994-10.1995
Military Service
06.1999-12.1999
Research Assistant, Institut fuer Kristallographie, RWTH Aachen in Germany
04.2000- 08.2001Research Assistant, Institut fuer Kristallographie, RWTH Aachen in Germany
10.2001- 08.2005 Scientific Co-Worker, Institut fuer Kristallographie, RWTH Aachen in
Germany
09.2002 6th Laboratory Course Neutron Scattering Forschungszentrum Jueich, Germany
06.2004-08.2005 Visiting Scientist at Forschungszentrum Jülich, Germany
10.2004-03.2005 TA, Introduction to the Crystallography, Institut fuer Kristallographie,
RWTH Aachen
09.2005-04.2006 Preparation for the SV30 transfer project from Germany to Korea (cancelled)
08.2006-11.2006 Postdoctoral Research Fellow at Korea Atomic Energy Research Institute
11.2006- 12.2006 Assistant Research Professor, Centre for Nano Science at Korea University, Korea
01.2007- 12.2007 Full time Lecturer, Department of Physics, Korea University
01.2008- Research Professor, Department of Physics, Korea University
Synthesis and characterisation of crystalline materials with interesting physical, chemical and technical characteristics
Investigations of structure , building of material and dynamics by means of X-ray and neutron dispersion
Solution breeding of high-perfect crystals e.g. ferroelectrics such as X(H, D)2 PO4 with X = K, Rb, Tl
Crystal analyse at powder samples with Rietveld profile-analysis and at single crystals complete software for the treatment of anharmonic effects and crystal twins
Investigations of phase transitions by means of group- and subgroup relationships
Current research interest
Order-disorder behaviour of H-Atoms in TlH2PO4
TlH2PO4(TDP) belongs to the family of hydrogen-bonded (anti)ferroelectric materials of KH2PO4 (KDP) type. This compound shows two phase transitions at T1 = 357K and T2 = 230K. The transiton at 357K is known to be ferroelastic. In the ferroelastic phase of TlH2PO4 there are two types of H-atoms, namely H1-type atoms, which are still dynamically disordered and H2-type atoms, which become ordered. In this compound antiferroelectricity is directly associated with the ordering of H1-type atoms. In the ordering process one of the two crystallographic centers of inversion is lost. The dynamical ordering of H-atoms in the high-temperature phase is known to be directly correlated to the configuration of the PO4 groups. And the crystal structure at low temperature has not been solved until now. In order to confirm the above mentioned fact and in order to determine the low-temperature phase I am carrying out the neutron diffraction experiment with TlH2PO4- single crystal in the range from room temperature to 20K.
07.03.08