• Proceedings of the Korean Vacuum Society Conference
• /
• 2009.08a
• /
• pp.321-321
• /
• 2009

• Proceedings of the Korean Vacuum Society Conference
• /
• 1997.07a
• /
• pp.139-141
• /
• 1997

• Proceedings of the Korean Magnestics Society Conference
• /
• 2011.06a
• /
• pp.136-136
• /
• 2011

• Proceedings of the Korean Magnestics Society Conference
• /
• 2014.05a
• /
• pp.128-128
• /
• 2014

• Proceedings of the Korean Vacuum Society Conference
• /
• 2003.02a
• /
• pp.166-166
• /
• 2003

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2000.11a
• /
• pp.65-65
• /
• 2000

• 한국초전도학회:학술대회논문집
• /
• v.9
• /
• pp.292-295
• /
• 1999

We investigated the effects of Pd impurities on cube-textures in cold rolled and recrystallized PtPd tapes The sample were made from Pt$_{1-x}Pd_x$ alloys (x from 0 to0.34) by rolling at low temperature. The thickness of the tapes were about 100 ${\mu}$m. The PtPd[111] pole figures of X-ray Diffraction for all the samples indicated similar deformed textures. But the recrystallized textures after annealing showed that a better cube texture was formed in the sample of larger x. The final textures were sensitive to annealing time and temperature when x was increased.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.14 no.5
• /
• pp.410-416
• /
• 2001

KLN thin films were fabricated on Pt coated Si(100) wafer using an rf-magnetron sputtering method. The grown KLN thin film consists of 4-fold grains. In this experiment, the structure of 4-fold grained thin film was investigated using XRD and SEM measurements. Pt layer was also deposited using the rf-magnetron sputtering method,. XRD measurement showed that he Pt thin film has Gaussian distribution form with strong (111) direction orientation. The KLN thin film has preferred-orientation of (001) direction, and the peak consists of 2 separate peaks; one with broad FWHM and the other with narrow FWHM. The sharp peak is due to single crystal, and combining with Em results, the 4-fold grain consists of singel crystals with c-axis normal to substrate.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.28 no.12
• /
• pp.787-791
• /
• 2015

In this paper, the growing orientation of PMN-PT single crystal is analyzed using the Laue-Back Reflection Method. Two kinds of PMN-PT single crystals are grown using the Bridgman growing method in the [001] and [111] directions and their the Laue photographs are simulated assuming cubic crystal systems. From the comparison between simulation and test results, it can be concluded that the single crystals are grown in the desired crystal orientations.

• Transactions of the Korean hydrogen and new energy society
• /
• v.23 no.3
• /
• pp.256-263
• /
• 2012

We studied the degradation phenomenon of Pt catalyst in PEMFC. We used the electron microscope analysis technique including the ultra-microtome pretreatment method, FEG-SEM and TEM analysis methods for analysis of Pt nanoparticles. The Pt catalyst degradation is observed not only in electrode site but also in membrane site. We investigated these various degradation phenomena. The cathode electrode layer thickness is reduced. The size of the catalyst is increased much larger than initial size in membrane site. The catalyst moved from electrode layer to the electrolyte membrane. The rounded shape of catalyst was changed to the polygon. As a result, we found that the catalyst degradation processes of migration and coarsening occurred by the followings mechanisms; (1) dissolution of Pt ; (2) diffusion of Pt ion ; (3) Pt ion chemical reduction in membrane; (4) Coarsening of Pt particles (Ostwald ripening) ; (5) polygon shape change of Pt by {111} plane growth.