21 Result(s)

Article

Magnetic Response of Hydrothermally Prepared Self-Assembled Co₃O₄ Nano-platelets

In the present communication, we report a strong ferrimagnetic behavior of self-assembled Co₃O₄ nano-platelets, which most likely originates from the intrinsic spin structure of the unique Co₃O₄ structure. The mi...

M.A. Dar, S.H. Nam, J.Y. Kim, I. Ahmad, B.K. Cho… in Journal of Electronic Materials (2015)

Article

Electrical and Optical Studies of the Organic Thin Film Devices Produced by Cluster Beam Deposition Methods

The neutral and ionized cluster beam deposition (NCBD and ICBD) methods have been applied to fabricate the new double-layer organic light emitting devices (OLEDs) with the structure of indium-tin-oxide (ITO)-c...

J. Y. Kim, E. S. Kim, J. H. Choi in MRS Online Proceedings Library (2011)

Article

Nondestructive evaluation of flow properties in thermally aged Cr–Mo–V steel using instrumented indentation tests

Instrumented indentation technique has been utilized to assess the flow properties in X20CrMoV12.1 steel, widely used in power generation facilities, at various heat treatment stages simulating thermal aging d...

J.-Y. Kim, J.-J. Lee, K.-W. Lee, D. Kwon in Journal of Materials Science (2009)

Article

Efficiency enhancement in low-bandgap polymer solar cells by processing with alkane dithiols

High charge-separation efficiency combined with the reduced fabrication costs associated with solution processing and the potential for implementation on flexible substrates make ‘plastic’ solar cells a compel...

J. Peet, J. Y. Kim, N. E. Coates, W. L. Ma, D. Moses, A. J. Heeger… in Nature Materials (2007)

Article

Effect of Cu content on the mechanical reliability of Ni/Sn-3.5Ag system

Copper was supplied to Sn–3.5Ag by electroplating Cu/Ni double under-bump metallization (UBM), and the amount of Cu was controlled by varying the Cu UBM thickness. Supposed Cu contents in the solder were; 0.2,...

J. Y. Kim, Y. C. Sohn, ** Yu in Journal of Materials Research (2007)

Article

High-temperature tolerance of the silver-copper oxide braze in reducing and oxidizing atmospheres

The silver-copper oxide–based reactive air brazing technique was developed as a method of joining complex-shaped ceramic parts. To investigate the viability of this approach for high-temperature application, a...

J. Y. Kim, J. S. Hardy, K. S. Weil in Journal of Materials Research (2006)

Article

Silver-copper oxide based reactive air braze for joining yttria-stabilized zirconia

We investigated a new method of ceramic-to-metal joining, referred to as reactive air brazing, as a potential method of sealing ceramic components in high-temperature electrochemical devices. Sessile drop wett...

J. Y. Kim, J. S. Hardy, K. S. Weil in Journal of Materials Research (2005)

Article

The effects of electroplating parameters on the composition and morphology of Sn-Ag solder

The Sn-Ag solder was electrodeposited from a bath that basically is composed of tin sulfate (SnSO₄), silver nitrate (AgNO₃), and thiourea (CH₄N₂S), acting as a complexing agent to silver. The composition and morp...

J. Y. Kim, J. Yu, J. H. Lee, T. Y. Lee in Journal of Electronic Materials (2004)

Article

Residual stress and interfacial reaction of the electroplated Ni-Cu alloy under bump metallurgy in the flip-chip solder joint

Pure Ni, the Ni-Cu alloy, and pure Cu layers as the under bump metallurgy (UBM) for a flip-chip solder joint were deposited by electrolytic plating. For the pure Ni layer, residual stress can be controlled by ...

S. -H. Kim, J. -Y. Kim, J. Yu, T. Y. Lee in Journal of Electronic Materials (2004)

Article

An approach to durable poly(vinylidene fluoride) thin film loudspeaker

The piezoelectric poly(vinylidene fluoride) (PVDF) surface possessing low surface energy was modified by the ion-assisted-reaction (IAR) method for the application of thin film speaker. The IAR-treated hydroph...

C. S. Lee, J. Y. Kim, D. E. Lee, J. Joo, S. Han… in Journal of Materials Research (2003)

Article

Mechanism of surface modification of a porous-coated Ti-6Al-4V implant fabricated by electrical resistance sintering

A porous-coated Ti-6Al-4V implant was fabricated by electrical resistance sintering, using 480 μF capacitance and 1.5 kJ input energy. X-ray photoelectron spectroscopy (XPS) was used to study the surface chara...

W. H. Lee, S. J. Kim, W. J. Lee, C. S. Byun, D. K. Kim… in Journal of Materials Science (2001)

Article

Deformation in the hysteresis loop of Pt/Pb(Zr,Ti)O3/Pt thin-film capacitors

E. G. Lee, J. K. Lee, J. G. Lee, J.-Y. Kim… in Journal of Materials Science Letters (1999)

Article

Measurements of the Hydrogen Absorption Pressurecomposition Isotherms IN Ti/Zr-Based Quasicrystals

The first hydrogen absorption pressure-composition isotherms (p-c-T) were measured in quasicrystalline Ti₄₅Zr₃₈Ni₁₇. No evidence for a pressure plateau was found, indicating a distribution of energies for the hyd...

J. Y. Kim, E. H. Majzoub, P. C. Gibbons, K. F. Kelton in MRS Online Proceedings Library (1998)

Article

Hydrogen Sites in the α(TiCrSiO) 1/1 Approximant Phase

Crystal approximant phases are important because they are believed to have a similar local atomic structure to corresponding quasicrystals. Interstitial hydrogen is used as a probe of the local structures of t...

J. Y. Kim, W. J. Kim, W. B. Yelon, P. C. Gibbons… in MRS Online Proceedings Library (1998)

Article

Exafs Evidence For Atom Location in Icosahedral TiZrNi and Hydrogenated TiZrNi Quasicrystals

We present results from the first extended X-ray absorption fine-structure studies in a Ti/Zrbased quasicrystal. the icosahedral Ti₅₃Zr₂₇Ni₂₀ phase and an icosahedral Ti₄₅Zr₃₈Ni₁₇ phase that also contains 1.7 hyd...

A. Sadoc, J. Y. Kim, K. F. Kelton in MRS Online Proceedings Library (1998)

Article

Effect of Bragg reflector on the threshold current density in AlGaInP visible laser

The GalnP/AlGalnP layers are known as attractive materials for 600 nm band laser diodes. In this paper, a Bragg reflector between GaAs substrate and n-cladding layer was applied for the reduction in the lasing...

M. S. Oh, N. H. Kim, C. H. Lee, H. S. Park, J. Y. Kim… in Journal of Electronic Materials (1995)

Article

Morphological Effect on the Mechanical Behavior of a Two-Phase Ti₃Al-Nb Alloy

A study has been made on the deformation and fracture behavior of a two-phase (α₂ + β) Ti₃Al-Nb alloy, with particular emphasis on the effect of morphologies. The coarse colony structure obtained by continuously ...

Nack J. Kim, J. Y. Kim, W. S. Cho in Metallurgical Transactions A (1993)

Article

Effect of processing conditions on the characteristics of pores in hot isostatically pressed alumina

Effect of processing conditions on the characteristics of residual pores was studied with an optical microscope in hot isostatically pressed translucent alumina ceramics. Green bodies formed by isostatic press...

K. Uematsu, M. Sekiguchi, J. -Y. Kim, K. Saito, Y. Mutoh… in Journal of Materials Science (1993)

Article

Characterization of internal structure in Y-TZP powder compacts

The internal structure of yttrium-doped tetragonal zirconia powder compact was characterized using the immersion liquid technique, mercury porosimetry, scanning electron microscopy, and a compaction test. The ...

J. -Y. Kim, M. Miyashita, M. Inoue, N. Uchida, K. Saito… in Journal of Materials Science (1992)

Article

Characterization of internal structure in Y-TZP powder compacts

The internal structure of yttrium-doped tetragonal zirconia powder compact was characterized using the immersion liquid technique, mercury porosimetry, scanning electron microscopy, and a compaction test. The ...

J. -Y. Kim, M. Miyashita, M. Inoue, N. Uchida, K. Saito… in Journal of Materials Science (1992)