15 Result(s)

Article

Sintering and optical properties of transparent ZnS ceramics by pre-heating treatment temperature

The main objective of our work is to increase transmittance in the mid infrared region by removing impurities through the pre-heating treatment of zinc sulfide (ZnS) produced by hydrothermal synthesis. The pre...

Seo-Yeong Yeo, Tae-Hyeong Kwon, Chang-Sun Park, Chang-Il Kim… in Journal of Electroceramics (2018)

Article

Increasing Energy-harvesting ability of piezoelectric unimorph cantilevers using Spring Supports

We fabricated a spring-supported piezoelectric unimorph cantilever (SPUC) with enhanced energy-harvesting characteristics by using a 0.69Pb(Zr_0.47Ti_0.53)O₃–0.31Pb(Ni_0.6Zn_0.4)_1/3Nb_2/3)O₃ + CuO (0.5 mol%) thick fil...

Kyung Bum Kim, San Nahm, Tae Hyun Sung… in Journal of the Korean Physical Society (2016)

Article

Fabrication and testing of high performance acoustic emission sensor with Ta-Doped lead zirconate titanate

The piezoelectric and dielectric properties of ceramics containing Pb(Zr_0.54Ti_0.46) O₃ + 0.2 wt.% Cr₂O₃ + x wt.% Ta₂O₅, where x = 0.0 to 5.0, were investigated for the development of a high performance acoustic e...

Dong-Hyung Kang, Kwang Lok Kim, Dong Gyu Yang… in Journal of Electroceramics (2015)

Article

IPMC actuators based on metal–Nafion™ composite films prepared by thermal decomposition of noble metal complexes

A simple and highly efficient compositing process was developed by synthesizing Pt or Pd nanoparticles embedded in polymers (Nafion™) with uniform distribution by in situ thermal decomposition of noble metal c...

Kwang Suk Yang, Hyung-Kun Lee, Nak-** Choi, Young Hun Jeong… in Applied Physics A (2015)

Article

Energy harvesting characteristics of unimorph cantilever generator using 0.69Pb(Zr_0.47Ti_0.53)O₃-0.31Pb(Ni_0.6Zn_0.4)_1/3Nb_2/3)O₃ + 0.5 mol% CuO (PZCN) thick films under various sintering conditions

A 0.69Pb(Zr_0.47Ti_0.53)O₃-0.31Pb(Ni_0.6Zn_0.4)_1/3Nb_2/3)O₃ +0.5 mol% CuO (PZCN) thick films were investigated for potential use in energy harvesting device applications. The PZCN thick films were fabricated by a conv...

Kyoung-Bum Kim, Daniel Song, Yong Hun Jeong, Jong Hoo Paik… in Journal of Electroceramics (2015)

Article

Admittance spectroscopy and electrical properties of Co₃O₄-doped ZnO

The varistor characteristics of 0.1–3.0 at. % Co-doped ZnO have been investigated. Three kinds of deep bulk trap levels of 0.16, 0.25, and ~0.31 eV were identified as donor levels by admittance spectroscopy. O...

Youn-Woo Hong, Young-** Lee, Sei-Ki Kim, Jong-Hoo Paik… in Electronic Materials Letters (2014)

Article

High energy-density 0.72Pb(Zr_0.47Ti_0.53)O₃-0.28Pb[(Zn_0.45Ni_0.55)_1/3Nb_2/3]O₃ thick films fabricated by tape casting for energy-harvesting-device applications

0.72Pb(Zr_0.47Ti_0.53)O₃-0.28Pb[(Zn_0.45Ni_0.55)_1/3Nb_2/3]O₃ (0.72PZT-0.28PZNN) thick films were prepared by using a tape casting method to develop new materials with high energy-density applicable to energy-harvestin...

Chang Jun Jeon, Ha Na Hwang, Young Hun Jeong… in Journal of the Korean Physical Society (2013)

Article

Positive temperature coefficient of resistance effect in Na₂Ti₆O₁₃-doped 0.94BaTiO₃–0.06(Bi_0.5Na_0.5)TiO₃ ceramics

The positive temperature coefficient of resistance (PTCR) characteristics of Na₂Ti₆O₁₃ (NT)-doped 0.94BaTiO₃–0.06(Bi_0.5Na_0.5)TiO₃ (BBNT) ceramics were investigated in order to evaluate the effect of NT as a new a...

Young Hun Jeong, Yu-Joung Cha, Chang-Il Kim, Young-** Lee… in Applied Physics A (2012)

Article

Fabrication of a high performance acoustic emission (AE) sensor to monitor and diagnose disturbances in HTS tapes and magnet systems

An acoustic emission (AE) technique was introduced as a non-destructive method to monitor sudden deformation caused by local heat concentrations and micro-cracks within superconductors and superconducting magn...

Ju-Hyung Kim, Jung-Bin Song, Young Hun Jeong… in Metals and Materials International (2010)

Article

Photoluminescence and photocurrent characteristics of Eu^{2 +} activated MAl₂O₄ (M = Ba, Ca, Sr) phosphors

Photoluminescence and photocurrent characteristics of Eu^{2 +} activated MAl₂O₄ (M = Ba, Ca, Sr) phosphors during and after Ultraviolet ray and visible light irradiation have been investigated. The photoluminescence...

Sei-Ki Kim, Mi-Jae Lee, Jong-Hoo Paik, Byung-Hyun Choi in Journal of Electroceramics (2006)

Article

Effect of B₂O₃ and CuO on the sintering temperature and microwave dielectric properties of the BaTi₄O₉ ceramics

The effect of B₂O₃ and CuO on the sintering temperature and microwave dielectric properties of BaTi₄O₉ ceramics was investigated. The BaTi₄O₉ ceramics were able to be sintered at 975^∘C when B₂O₃ was added. This d...

Jong-Bong Lim, Sahn Nahm, Hyo-Tae Kim, Jong-Hee Kim… in Journal of Electroceramics (2006)

Article

Crystal structure of (Ba_1−x Lax) [Mg_{(1 + x)/3}Nb_(2−x)/3]O₃ ceramics

The crystal structure of (Ba_1−x La _x )[Mg_{(1 + x)/3}Nb_(2−x)/3]O₃ (BLMN) ceramics with 0 ≤ x ≤ 1 was investigated using X-ray diffraction (XRD) and high resolution transmission elec...

Jong Hoo Paik, Sahn Nahm, Young Sik Kim, Hyun Min Park… in Journal of Materials Science (2003)

Article

Crystal structure and microwave dielectric properties of La(Mg1/2Ti1/2)O3 ceramics

Dong-Yoon Lee, Seok-** Yoon, Jae Hyun Yeo… in Journal of Materials Science Letters (2000)

Article

Structural and microwave dielectric properties of La(Mg2/3Nb1/3)O3 ceramics

Jong Hoo Paik, Chang-Hak Choi, Sahn Nahm… in Journal of Materials Science Letters (1999)