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Thermoelectric Performance of Sn and Bi Double-Doped Permingeatite
Hee-Jae Ahn, Il-Ho Kim
Korean J. Met. Mater. 2022;60(8):593-600.   Published online 2022 Jul 12
DOI: https://doi.org/10.3365/KJMM.2022.60.8.593

Abstract
In this study, mechanical alloying was performed to synthesize permingeatite Cu3Sb1-x-ySnxBiySe4 (0.02 ≤ x ≤ 0.06 and 0.02 ≤ y ≤ 0.04) doped with Sn and Bi. Hot pressing was subsequently conducted to achieve dense sintered bodies. When the Bi content was constant, the carrier concentration increased with the Sn..... More

                        
Physical Vapor Transport Process for Highly Purified Hg2Br2 Crystal: from Powder Purification to Crystal Growth
Ojun Kwon, Yonghui Song, Shi-Gwan Woo, Woojin Park, Byungjin Cho
Korean J. Met. Mater. 2022;60(7):551-556.   Published online 2022 Jun 3
DOI: https://doi.org/10.3365/KJMM.2022.60.7.551

Abstract
High quality Hg2Br2 crystal grown via the physical vapor transport (PVT) process is essential for the fabrication of the acousto-optic tunable filters (AOTFs) module. The full process flow, including powder purification and crystal growth, should be systematically established, but there have been few reports about the fully established process flow..... More

                        
Enhanced Photoelectrochemical Water-Splitting through Application of Layer by Layer (LBL) and Hydrothermal (HT) Methods in TiO2 and α-Fe2O3 Hierarchical Structures
Aryan Azad, Sun Jae Kim
Korean J. Met. Mater. 2022;60(7):517-522.   Published online 2022 Jun 3
DOI: https://doi.org/10.3365/KJMM.2022.60.7.517

Abstract
Improving solar energy conversion efficiency and reducing energy loss have become critical issues in recent decades. Photoelectrochemical (PEC) water splitting provides an ideal method for solar energy harvesting and is a key factor in decreasing the use of fossil fuels. Thus, it is extremely important to identify cost-effective, highly active,..... More

                        
Effect of Ethylene Glycol on the Dissolution of Palladium with HCl Solution Containing Oxidizing Agents and Selective Precipitation of Pd(IV) Compound
Viet Nhan Hoa Nguyen, Si Jeong Song, Man Seung Lee
Korean J. Met. Mater. 2022;60(7):502-510.   Published online 2022 Jun 3
DOI: https://doi.org/10.3365/KJMM.2022.60.7.502

Abstract
There is growing interest in the recovery of pure palladium (Pd) compound from cemented Pd from spent electroplating solutions due to increasing demand for Pd, and there is considerable motivation to develop an efficient recovery process. In conventional methods of leaching Pd metal, HCl solutions containing oxidizing agents are employed...... More

                        
Effect of Sn addition on the Microstructure and Friction–wear Properties of a Nodular Graphite Cast Iron
Won-Sang Shin, Seungwoo Baek, Yoon-Jun Kim
Korean J. Met. Mater. 2022;60(6):471-477.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.471

Abstract
Nodular graphite cast iron is used in the railway and automobile industries because of its excellent workability, abrasion resistance, mechanical strength, and hardenability. To use nodular graphite cast iron in harsh environments, it is essential to examine their friction–wear properties in conjunction with the surface hardness of the materials. Therefore,..... More

                        
Skinnerite Cu3SbS3: Solid-State Synthesis and Thermoelectric Properties
Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2022;60(6):455-462.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.455

Abstract
Skinnerite Cu3SbS3, which consists of non-toxic and low-cost elements, is a potential thermoelectric material, however, studies on its thermoelectric properties are limited. In this study, the optimal conditions of mechanical alloying (MA) and hot pressing (HP) for the synthesis of the Cu3SbS3 phase were investigated, and its thermoelectric properties were..... More

                        
Preparation and Thermoelectric Properties of Si-Doped Tetrahedrites Cu12Sb4-ySiyS13
Min-Cheol Kwon, Il-Ho Kim
Korean J. Met. Mater. 2022;60(6):440-447.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.440

Abstract
Si-doped Cu12Sb4-ySiyS13 (y = 0.1-0.4) compounds were prepared using solid-state synthesis. Each specimen consisted of a single tetrahedrite phase with a densely sintered body whose relative density exceeded 98.9%. The lattice constant decreased from 1.0357 nm to 1.0336 nm as the Si content increased. When the Si doping content (y)..... More

                        
Process Optimization for Dual Laser Beam Joining for Dissimilar Plastics
Suwon Kim, PilGong Choi, Soo Jin Choi, Sang Bae Han, Jiyeon Choi, Jeng O Kim, Hyonkee Sohn, Sanghoon Ahn, Jiwhan Noh, Heeshin Kang, Kwangyun Jung, Dohyun Kim, Hyun-Deok Kim, Changkyoo Park
Korean J. Met. Mater. 2022;60(6):432-439.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.432

Abstract
A dual laser beam joining process is introduced for joining dissimilar plastics. A customized laser head was built, and two different diode lasers with central wavelengths of 980 and 1940 nm were simultaneously applied to obtain PMMA/PC-1 and PC-2/ABS joints. Various experimental conditions were employed for the dual laser beam..... More

                        
Continuous Synthesis of Monodisperse Spherical Silica Powder Using Tubular Reaction System
Young-Sang Cho, Chiyeop Hwang, Seong-Jun Kim, U-Hyeon Park
Korean J. Met. Mater. 2022;60(6):409-422.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.409

Abstract
In the present study, monodisperse silica nanospheres were synthesized using a tubular reaction system in a continuous way. Screw-type blades were inserted inside a T-mixer for static mixing of the reactant streams which consisted of TEOS and NH4OH/H2O diluted with ethanol, for the continuous synthesis of the silica suspension. The..... More

                        
Optimization of Two-Stage Hybrid Forming Process via Quantitative Assessment of Mechanical Properties in AA5052
Sang Soo Lee, Seon Du Choi, Ho Geun Shin, Suman Timilsina, Seong Min Jang, Young Seon Lee, YongNam Kwon, Ji Sik Kim
Korean J. Met. Mater. 2022;60(5):391-399.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.391

Abstract
Superplastic forming (SPF) is a promising approach used for manufacturing parts with complex geometries, especially in the automotive, aerospace, and marine industries. However, the wider use of this method is limited by issues of low forming rate, high-temperature requirement, non-uniform thickness distribution, and expensive base materials. The two-stage hybrid forming..... More

                        
Preparation and Investigation of Thermoelectric Properties of Cu3SbS4-Cu3SbSe4 Solid Solutions
Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2022;60(5):384-390.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.384

Abstract
Cu-based ternary chalcogenides composed of earth-abundant and nontoxic elements are considered promising thermoelectric materials, although there are few reports on them. In our previous studies, optimal mechanical alloying (MA) and hot pressing (HP) were used to synthesize Cu3SbS4 (famatinite) and Cu3SbSe4 (permingeatite). In this study, solid solutions of Cu3SbS4-ySey (y..... More

                        
Solid-State Synthesis and Thermoelectric Properties of Ge-Doped Tetrahedrites Cu12Sb4-yGeyS13
Se-In Jeong, Il-Ho Kim
Korean J. Met. Mater. 2022;60(5):376-383.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.376

Abstract
Ge-doped tetrahedrites Cu12Sb4-yGeyS13 (y = 0.1–0.4) were prepared using mechanical alloying and hot pressing. An X-ray diffraction analysis after mechanical alloying showed a single tetrahedrite phase without secondary phases. The tetrahedrite phase was stable after hot pressing at 723 K under 70 MPa. As the Ge content increased, the lattice..... More

                        
Kerfless Si Wafering Using Al Metal Paste, Epoxy and Ni Electroplating as Stress-Induced Layer
Young Joon Cho, Hyo Sik Chang
Korean J. Met. Mater. 2022;60(5):370-375.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.370

Abstract
Kerfless wafering is a beneficial technique that enhances the cost effectiveness of crystalline silicon (c-Si) solar cells, preventing silicon (Si) waste during diamond sawing. This study compared the advantages of three stress layers for kerfless wafering: aluminum (Al) paste, epoxy-, and electroplated nickel (Ni). These materials demonstrated the ability to..... More

                        
Study of Phase Formation Behavior and Electronic Transport Properties in the FeSe2 -FeTe2 System
FeSe2-FeTe2 계 다결정 소재의 상 형성 거동 및 전기 전도 특성에 관한 연구
Okmin Park, TaeWan Kim, Se Woong Lee, Hyun-Sik Kim, Weon Ho Shin, Jamil Ur Rahman, Sang-il Kim
박옥민, 김태완, 이세웅, 김현식, 신원호, , 김상일
Korean J. Met. Mater. 2022;60(4):315-320.   Published online 2022 Mar 28
DOI: https://doi.org/10.3365/KJMM.2022.60.4.315

Abstract
In this study, we investigated the phase formation behavior of the FeSe2-FeTe2 system and the evolution of their thermoelectric transport properties. A series of Fe(Se1-xTex)2(x = 0, 0.2, 0.6, 0.8 and 1) compounds were synthesized by conventional solid-state reaction. Single phase orthorhombic structures were formed, except for FeSe0.4Te1.6(x = 0.2)...... More

                        
Recovery of High-Purity Lithium Compounds from the Dust of the Smelting Reduction Process for Spent Lithium-Ion Batteries
Thanh Tuan Tran, Seong Ho Son, Man Seung Lee
손성호, 이만승
Korean J. Met. Mater. 2022;60(4):291-300.   Published online 2022 Mar 28
DOI: https://doi.org/10.3365/KJMM.2022.60.4.291

Abstract
The recovery of valuable metals such as cobalt, nickel, and lithium from spent lithium-ion batteries (LIBs) has attracted much attention. In this study, a hydrometallurgical process for the recovery of high-purity lithium compounds like Li2CO3 and Li3PO4 from dust containing Li, Co, Ni, Cu, Fe, Mn, and Si produced during..... More

                        
Organic-Inorganic Hybrid Gate Dielectrics Using Self-Assembled Multilayers For Low-Voltage Operating Thin-Film Transistors
Yong-Wan Kim, Young-Geun Ha
Korean J. Met. Mater. 2022;60(3):220-226.   Published online 2022 Feb 8
DOI: https://doi.org/10.3365/KJMM.2022.60.3.220

Abstract
Advanced electronic materials have attracted great interest for their potential use in flexible, large-area, and printable electronic applications. However, fabricating high-performance low-voltage thin-film transistors (TFTs) for those applications with these advanced semiconductors is still challenging because of a lack of dielectric materials which satisfy both the required electrical and physical..... More

                        
Effects of Blended Poly(3-hexylthiophene) and 6,13-bis(triisopropylsilylethynyl) pentacene Organic Semiconductors on the Photoresponse Characteristics of Thin-Film Transistors
Hyunji Shin, Hyeonju Lee, Bokyung Kim, Xue Zhang, Jin-Hyuk Bae, Jaehoon Park
Korean J. Met. Mater. 2022;60(3):198-205.   Published online 2022 Feb 8
DOI: https://doi.org/10.3365/KJMM.2022.60.3.198

Abstract
In this study, we demonstrate high-performance optical wavelength-selective organic thin-film transistors (TFTs) that incorporate heterogeneous organic semiconductor materials, poly(3-hexylthiophene) (P3HT) and 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene). The electrical characteristics of the fabricated transistors were analyzed in the dark to determine how the P3HT:TIPS-pentacene ratio of the semiconductor affected the performance of the..... More

                        
Comparison of Phase Evolution and Sintering Properties of Ti-10Mo Alloys Prepared using Bulk Scrap and Blended Elemental (BE) Powder
In-Hyeok Choi, Jung-Min Oh, Daeyoung Kim, Jong-Woong Kim, Hanjung Kwon
Korean J. Met. Mater. 2022;60(3):180-187.   Published online 2022 Feb 8
DOI: https://doi.org/10.3365/KJMM.2022.60.3.180

Abstract
In this study, Ti-10Mo alloy powder and sintered bodies were successfully fabricated using a threestep process of acid/organic solvent cleaning, hydrogenation/dehydrogenation (HDH) of bulk Ti-Mo scrap, and pressureless vacuum sintering of the alloy powder. This process can be used to recycle valuable Ti alloy. And unlike remelting-based recycling processes, in..... More

                        
Dependency of Conductive Atomic Force Microscopy and Lateral Force Microscopy Signals on Scan Parameters for Zinc Oxide Nanorods
Yijun Yang, Kwanlae Kim
Korean J. Met. Mater. 2022;60(2):149-159.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.149

Abstract
Conductive atomic force microscopy (C-AFM) is one of the most commonly used characterization techniques for piezoelectric one-dimensional nanomaterials. However, a comprehensive understanding of the effects of certain scan parameters on the C-AFM signals remains elusive. In the present work, the dependency of C-AFM signals on the normal force, scan speed,..... More

                        
Sintering Mechanism and Enhanced Piezoelectric and Crystal Structural Properties of (1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 Lead Free Ceramics
Yoo-Young Oh, Gwangseop Lee, Masao Kamiko, Jung-Hyuk Koh
Korean J. Met. Mater. 2022;60(2):141-148.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.141

Abstract
A lead-free piezoelectric ceramic, (1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 (hereafter (1-x)BZT-xBCT), was investigated for functional device applications. Lead-free piezoelectric materials with high piezoelectric charge coefficients and voltage coefficients are indispensable for functional industrial applications. Piezoelectric ceramic specimens tend to shrink in size during the sintering process without melting. This study focused on this phenomenon..... More

                        
Thermal Properties of Copper Matrix-Ceramic Filler Composite Prepared by Polymer Solution Method
Bok-Hyun Oh, Chung-Il Ma, Ji-Yeon Kwak, Heon Kong, Sang-Jin Lee
Korean J. Met. Mater. 2022;60(1):68-75.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.68

Abstract
A copper (Cu) metal-ceramic filler composite with high thermal conductivity and a suitable thermal expansion coefficient was designed for application as a high-performance heat dissipation material. The purpose of the designed material was to utilize the high thermal conductivity of Cu while lowering its high coefficient of thermal expansion by..... More

                        
Improving the Corrosion Resistance of AISI 316L Steel for Semiconductor Piping by Controlled Delta-Ferrite Content
Young Woo Seo, Chan Yang Kim, Bo Kyung Seo, Won Sub Chung
Korean J. Met. Mater. 2022;60(1):46-52.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.46

Abstract
This study evaluated changes in delta-ferrite content depending on the preheating of AISI 316L stainless steel. We also determined the reasons for the variation in delta-ferrite content, which affects corrosion resistance. Changes in delta-ferrite content after preheating was confirmed using a Feritscope, and the microstructure was analyzed using optical microscopy..... More

                        
Effects of Si and Sn Contents and Heat-Treatment Temperature on the Corrosion Behavior of AISI 439 Ferrite Stainless Steel
Chan Yang Kim, Do hyung Kim, Won sub Chung
Korean J. Met. Mater. 2022;60(1):26-34.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.26

Abstract
This study was conducted to evaluate the corrosion resistance and optimize the heat-treatment process of AISI 439 ferrite stainless steel silicon and tin alloys with reduced chromium. The microstructure of the specimens and deposition under each condition were analyzed. The production of oxide films was compared based on the thickness..... More

                        
Shielding Analysis of Metal Hydride-based Materials for Both Neutron and Gamma Rays Using Monte Carlo Simulation
Jeongkwon Kwak, Boravy Muth, Hyeon-Woo Yang, Chang Je Park, Woo Seung Kang, Sun-Jae Kim
Korean J. Met. Mater. 2021;59(12):921-925.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.921

Abstract
Radiation causes damage to the human body, the environment, and electronic equipment. Shielding against neutron and gamma rays is particularly difficult because of their strong ability to penetrate materials. Conventional gamma ray shields are typically made of materials containing Pb. However, they pose problems in that Pb is a heavy..... More

                        
Synthesis of Nb0.8Hf0.2FeSb0.98Sn0.02 and Hf0.25Zr0.25Ti0.5NiSn0.98Sb0.02 Half-Heusler Materials and Fabrication of Thermoelectric Generators
Sung-Jae Joo, Ji-Hee Son, JeongIn Jang, Bong-Seo Kim, Bok-Ki Min
Korean J. Met. Mater. 2021;59(12):904-910.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.904

Abstract
In this study, half-Heusler (HH) thermoelectric materials Nb0.8Hf0.2FeSb0.98Sn0.02 (p-type) and Hf0.25Zr0.25Ti0.5NiSn0.98Sb0.02 (n-type) were synthesized using induction melting and spark plasma sintering. For alloying, a conventional induction melting technique was employed rather than arc melting, for mass production compatibility, and the thermoelectric properties of the materials were analyzed. The maximum dimensionless..... More

                           Cited By 1
Electrochemical Corrosion Resistance and Electrical Conductivity of Three-Dimensionally Interconnected Graphene-Reinforced Cu Composites
Xue Li, Ateeq Ahmed, Byung-Sang Choi
Korean J. Met. Mater. 2021;59(11):821-828.   Published online 2021 Oct 28
DOI: https://doi.org/10.3365/KJMM.2021.59.11.821

Abstract
A three-dimensionally interconnected graphene-reinforced Cu (3Di Gr-Cu) composite was synthesized using a simple two-step process technique which involves the mechanical compaction of micronsized Cu particles followed by chemical vapor deposition (CVD) at 995 ℃. The microstructural properties of pure Cu and the 3Di Gr-Cu composite were investigated by optical..... More

                           Cited By 1
Nano Silicon Composite with Gelatin/Melamine Derived N-doped Carbon as an Efficient Anode Material for Li-ion Batteries
Venugopal Nulu
Korean J. Met. Mater. 2021;59(11):802-812.   Published online 2021 Oct 28
DOI: https://doi.org/10.3365/KJMM.2021.59.11.802

Abstract
Silicon (Si) has a high theoretical capacity and low working potential vs. Li/Li+, and has been investigated as the most capable negative electrode material for lithium-ion batteries (LIBs). However, Si undergoes significant volume changes during the Li+ alloying/ dealloying processes, leading to unstable cycle life and limiting its practical applicability..... More

                        
Glycothermally Synthesized Self-aggregated ZnS Spherical Particles for Methyl Orange Photodecomposition
Sang-Jun Park, Jeong-Hwan Song
Korean J. Met. Mater. 2021;59(10):732-740.   Published online 2021 Sep 6
DOI: https://doi.org/10.3365/KJMM.2021.59.10.732

Abstract
Using ethylene glycol (C2H6O2) as the solvent, ZnS particles were synthesized in high yield at a relatively low temperature of 125 oC via the glycothermal method. We report a facile method for preparing spherical self-aggregated ZnS particles from ZnS nanocrystals, using zinc acetate as the Zn2+ source and thiourea as..... More

                           Cited By 2
Charge Transport and Thermoelectric Properties of Sn-Doped Tetrahedrites Cu12Sb4-ySnyS13
Hee-Jae Ahn, Il-Ho Kim
Korean J. Met. Mater. 2021;59(10):724-731.   Published online 2021 Sep 6
DOI: https://doi.org/10.3365/KJMM.2021.59.10.724

Abstract
In this study, tetrahedrite compounds doped with Sn were prepared by mechanical alloying and hot pressing, and their charge transport and thermoelectric properties were analyzed. X-ray diffraction analysis revealed that both the synthetic powders and sintered bodies were synthesized as a single tetrahedrite phase without secondary phases. Densely sintered specimens..... More

                           Cited By 2
Porous MnO2/ carbon Hybrid Material with Improved Electrochemical Performance
Venugopal Nulu
Korean J. Met. Mater. 2021;59(9):670-676.   Published online 2021 Aug 4
DOI: https://doi.org/10.3365/KJMM.2021.59.9.670

Abstract
In this work, MnO2 nanoparticles were embedded in a carbon matrix as a porous composite, fabricated using a simple chemical route followed by low-temperature annealing, with activated carbon (AC) as the carbon source in the composite preparation. The porous MnO2/carbon structures contained some selective nanoparticles coated with carbon. The structural..... More

                        
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