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Korean J. Met. Mater.
2024;62(4):306-311. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.306
Abstract
In this study, we enhanced the flexural strength of cordierite ceramics by incorporating h-BN (hexagonal boron nitride) nanoparticles, facilitated by the slip casting process. Initially, commercial cordierite powder with an average particle size of 10 mm underwent a ball-milling process to reduce the size to 2.5 mm and simultaneously achieve.....
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Korean J. Met. Mater.
2024;62(4):299-305. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.299
Abstract
To improve the hydrogen-storage properties of Mg
2
Ni, LiBH
4
was added by milling in hydrogen atmosphere (reactive mechanical milling, RMM). Mg
2
Ni-10LiBH
4
was prepared with a composition of 90 wt% Mg
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4
. The quantity of released hydrogen (H
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) versus temperature T curve for Mg
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Ni10LiBH
4
was obtained by heating at.....
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Korean J. Met. Mater.
2024;62(4):284-291. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.284
Abstract
: This study investigates the influence of surfactant (sodium dodecyl sulfate, SDS) concentration on the size and optoelectronic properties of poly(3-hexylthiophene) (P3HT) nanoparticles (NPs) synthesized via the mini-emulsion technique. P3HT NPs were fabricated with varying SDS concentrations. The size dependent optoelectronic properties, including the highest occupied molecular orbital (HOMO) and.....
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고신뢰성 적층 세라믹 커패시터를 위한 침식방지형 주석도금액 개발
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구본일, 김준성, 손유진, 민경석, 백성현
Korean J. Met. Mater.
2024;62(3):180-189. Published online 2024 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.180
Abstract
Capacitors not only store and release electricity but selectively conduct alternating current. Among the various types of capacitors, multi-layer ceramic capacitors (MLCCs) have been widely used in automotive, smartphone, and wearable devices because of their compact size and high capacitance capabilities. In this study, we have developed an electrolyte for.....
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알루미늄 5052-H32 합금과 6014-T4 합금의 저항 점 용접 시 용접성 및 미세조직 비교
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전현욱, 김재훈, 김원호, 천주용, 배기만, 이은경, 박영도, 지창욱
Korean J. Met. Mater.
2024;62(1):1-11. Published online 2023 Dec 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.1.1
Abstract
This study was performed to compare the resistance spot weldability of Al 5052-H32 alloy and Al 6014-T4 alloy, and the cause of the differences in the weldability was investigated. In general, the surface of the aluminum alloy has an oxide film several nm thick, and local heat input is generated.....
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DC 마그네트론 스퍼터링에서 입방정 질화붕소 박막의 증착 거동에 미치는 이온 플럭스 변화의 영향
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최영환, 허주열, 백영준
Korean J. Met. Mater.
2023;61(11):824-829. Published online 2023 Oct 29
DOI:
https://doi.org/10.3365/KJMM.2023.61.11.824
Abstract
Cubic boron nitride (cBN) thin films were deposited using DC magnetron sputtering, and the effect of the ion flux on the deposition behavior and residual stress of the cBN thin films was investigated. To increase the ion flux, the magnetic force ratio of the central/peripheral permanent magnets inserted in the.....
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Ag 코팅 Cu 플레이크의 산화 억제에 미치는 Ni interlayer 형성 도금욕의 영향
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김지환, 이종현
Korean J. Met. Mater.
2023;61(10):748-759. Published online 2023 Sep 25
DOI:
https://doi.org/10.3365/KJMM.2023.61.10.748
Abstract
To suppress Ag dewetting from around 200
o
C in Ag-coated Cu (Cu@Ag) flakes, Ag and Ni-coated Cu (Cu@Ni@Ag) flakes were fabricated by successive Ni and Ag electroless plating. The Ni bath type was an important consideration to induce differences in the Ag dewetting and resultant Cu oxidation. An acid Ni.....
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Korean J. Met. Mater.
2023;61(9):694-703. Published online 2023 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.9.694
Abstract
Wet chemical analysis techniques for four elements (M = As, Pb, Sb, and Sn) in Ag – M binary alloys were investigated with emphasis on the choice of solvent acid and the characteristic wavelength used in the ICP-AES (Inductively-Coupled Plasma Atomic Emission Spectrometer) analysis. The elements are representative tramp elements.....
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Web of Science 1
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Korean J. Met. Mater.
2023;61(9):652-658. Published online 2023 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.9.652
Abstract
A cold roll-bonding (CRB) process is applied to study the effects of stacking number on the microstructure and mechanical properties of roll-bonded and age-treated Al sheets. Commercial AA1050 and AA6061 sheets with a thickness of 2 mm were stacked alternately on each other to two and four layers, and roll-bonded.....
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Web of Science 3
Crossref 4
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COMSOL을 활용한 신 마그네슘 전해 공정 수치해석 모델 개발
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조매현, 정형준, 강정신, 장근옥
Korean J. Met. Mater.
2023;61(8):625-631. Published online 2023 Jul 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.8.625
Abstract
Magnesium (Mg) has good physical properties including light weight, excellent specific strength and high stiffness, and Mg is used in many fields. But current production methods of Mg have disadvantages, such as the generation of sulfur oxide and chlorine gas. In this situation, The Korea Institute of Geoscience and Mineral.....
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딥코팅 방법을 활용한 게이트 산화물 유전체 및 반도체 박막의 제조 및 박막트랜지스터 응용
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김용완, 하영근
Korean J. Met. Mater.
2023;61(8):581-588. Published online 2023 Jul 20
DOI:
https://doi.org/10.3365/KJMM.2023.61.8.581
Abstract
The potential applications of advanced electronic materials in large-area, printable, and flexible electronics have generated significant interest. However, creating high-performance, low-voltage thin-film transistors (TFTs) for these applications remains difficult due to a lack of advanced gate dielectric and semiconductor materials that meet both ease-of-fabrication requirements and high electrical performance. In.....
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Ti-5Mo-2Fe 합금의 시효처리 조건에 따른 미세조직 변화 및 기계적 특성
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김홍민, 박세영, 이동근
Korean J. Met. Mater.
2023;61(8):545-552. Published online 2023 Jul 20
DOI:
https://doi.org/10.3365/KJMM.2023.61.8.545
Abstract
Beta-type titanium alloys have a low elastic modulus, excellent cold workability, and are widely used as implant materials. High strength is possible by forming a precipitation in the β-matrix via solution treatment and aging treatment. However, beta titanium alloys require a large amount of beta-stabilizing elements (Fe, Nb, Mo, Ta,.....
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Web of Science 1
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-
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K
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Korean J. Met. Mater.
2023;61(7):524-533. Published online 2023 Jun 21
DOI:
https://doi.org/10.3365/KJMM.2023.61.7.524
Abstract
A356 cast aluminum alloy contains 7 at.% Si and 0.3 at.% Mg, producing an approximately 50% eutectic microstructure. This high Si content and various casting conditions play a significant role in strengthening A356 alloy, by controlling the eutectic morphology and precipitates of other intermetallic compounds. Understanding how Si-related precipitates and.....
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Web of Science 1
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MgO 나노선의 성장과 음극선 발광 특성에 미치는 산소 농도의 영향
G
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H
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L
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이근형
Korean J. Met. Mater.
2023;61(7):509-513. Published online 2023 Jun 21
DOI:
https://doi.org/10.3365/KJMM.2023.61.7.509
Abstract
MgO nanowires were grown by a thermal evaporation method at different N
2
/O
2
gas ratios in order to investigate the effect of oxygen concentration on the growth and luminescence properties of the MgO nanowires. A thermal evaporation process was conducted at 1000
o
C and under a pressure of 500Torr. No nanowires were.....
More
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ZnO/Cu/Al
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구조의 유연 투명 면상발열체 연구
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김희창, 최두호
Korean J. Met. Mater.
2023;61(7):480-488. Published online 2023 Jun 21
DOI:
https://doi.org/10.3365/KJMM.2023.61.7.480
Abstract
In this study, we fabricated transparent heaters composed of an ultrathin Cu-layer heating element sandwiched between a ZnO underlayer and an Al
2
O
3
overlayer. With the Cu layer thickness fixed at 8.5 nm, the thicknesses of the ZnO and Al
2
O
3
layers were independently varied to reach the optimum antireflecting condition (maximum.....
More
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대기압의 공기 분위기에서 열증발법에 의해 합성된 가지상 구조의 MgO 나노선
G
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L
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이근형
Korean J. Met. Mater.
2023;61(6):444-448. Published online 2023 May 18
DOI:
https://doi.org/10.3365/KJMM.2023.61.6.444
Abstract
MgO nanowires with a branched structure were fabricated using a thermal evaporation method in air at atmospheric pressure. The branched MgO nanowire was made up of two parts: a primary central nanowire trunk and lots of secondary nanowire branches. The branched MgO nanowires had a 4-fold symmetrical structure. The secondary.....
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기계학습을 이용한 색상형 미세조직의 결정립 크기 측정
J
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n
-
H
o
J
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,
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-
S
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K
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정준호, 김희수
Korean J. Met. Mater.
2023;61(5):379-387. Published online 2023 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2023.61.5.379
Abstract
We constructed a convolutional neural network to estimate average grain size from microstructure images. In the previous study from our research group, the network was trained using GB-type images in which the grain matrix and grain boundary were represented in white and black, respectively. The model well estimated the same.....
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O
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슬래그 내 산화물의 상관관계로 보는 고대 제철 발전사 연구
G
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오광섭, 정원섭
Korean J. Met. Mater.
2023;61(4):291-300. Published online 2023 Mar 22
DOI:
https://doi.org/10.3365/KJMM.2023.61.4.291
Abstract
A lot of slag was produced by ancient production processes such as smelting, melting, and refining. Iron slag has information that can be used to determine the characteristics of the site, the iron-making process and manufacturing date, but there is a limit to reading information through visual observation and nondestructive.....
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Crossref 1
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L
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r
은 인쇄 전극과 PEI 접착 층을 사용한 용액공정 OLED
C
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H
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M
o
o
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문철희
Korean J. Met. Mater.
2023;61(3):175-182. Published online 2023 Feb 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.3.175
Abstract
We demonstrated a bonding technology using polyethyleneimine (PEI) as a bonding layer between printed Ag electrodes and an emission material layer (EML) to fabricate all-solution-processed Organic LightEmitting Diodes (OLEDs). We manufactured Ag electrodes on a glass substrate by the screen printing method, which was bonded to another substrate with ITO.....
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Web of Science 1
Crossref 1
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연속주조 스테인리스강 슬라브의 결정립 조직 예측
H
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S
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K
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m
,
J
i
-
J
o
o
n
K
i
m
김희수, 김지준
Korean J. Met. Mater.
2023;61(1):60-68. Published online 2022 Dec 28
DOI:
https://doi.org/10.3365/KJMM.2023.61.1.60
Abstract
Macrostructural features in continuously-cast stainless steel slabs such as the distribution of equiaxed and columnar grains, and microporosity, are crucial to the post-processes, and the mechanical properties of the final steel products. Among the methods for controlling grain structure during the continuous casting process, the application of electromagnetic stirring (EMS).....
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Web of Science 1
Crossref 1
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Forsterite 리튬 이온 배터리 음극 제조 및 전기화학적 반응 탐침
D
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g
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P
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김동주, 박병남
Korean J. Met. Mater.
2022;60(11):851-857. Published online 2022 Oct 31
DOI:
https://doi.org/10.3365/KJMM.2022.60.11.851
Abstract
In an effort to minimize irreversible capacity loss and volume expansion, research on Si nanocomposite materials with a SiO
x
/Mg
2
SiO
4
/SiO
x
structure through a magnesiothermic reduction process (MTR) has attracted much attention from researchers. Mg
2
SiO
4
(forsterite) has been shown to improve the initial coulombic efficiency (ICE) by minimizing the irreversible capacity loss due.....
More
Web of Science 1
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표면적이 발달된 1.5 μm Ag 입자 기반 페이스트의 초고속 열압착 소결접합 및 열처리 효과
Y
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J
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김영중, 한병조, 이종현
Korean J. Met. Mater.
2022;60(11):827-836. Published online 2022 Oct 31
DOI:
https://doi.org/10.3365/KJMM.2022.60.11.827
Abstract
To rapidly sinter a bondline and obtain mechanical stability at high temperature and high thermal conductivity, 1.5 μm Ag particles with enhanced surface area were synthesized by a wet-chemical method, and a sinter-bonding paste containing these Ag particles was obtained. Some particles were present in the form of agglomerates of.....
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Web of Science 1
Crossref 2
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소부경화강의 변형 시효 및 수소취성 거동에 미치는 미세조직의 영향
J
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H
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김재윤, 고석우, 황병철
Korean J. Met. Mater.
2022;60(11):811-818. Published online 2022 Oct 31
DOI:
https://doi.org/10.3365/KJMM.2022.60.11.811
Abstract
The strain aging and hydrogen embrittlement behavior of two bake hardening (BH) steels with different microstructures were investigated in this study. The single-phase BH steel was composed of fully ferrite, while the dual-phase BH steel consisted of ferrite and 3 % martensite. The BH index and aging index (AI) of.....
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Web of Science 3
Crossref 3
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슬래그의 미세구조 및 화학분석을 통한 6-7세기 한국의 청동 야금 기술 연구
S
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K
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김소진, 한우림, 문동혁, 이나라, 김영도
Korean J. Met. Mater.
2022;60(10):774-781. Published online 2022 Sep 29
DOI:
https://doi.org/10.3365/KJMM.2022.60.10.774
Abstract
Metallurgical remains such as crucible, mould, slag and tuyere are generated in the production of bronze. The analysis of slag in particular can be used to identify the raw materials, processes and environments (temperature and condition) employed in the bronze fabrication . The Gwanbuk-ri site in Buyeo is known as.....
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Web of Science 1
Crossref 1
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대기압의 공기 분위기에서 열증발법에 의해 제작된 초박형 MgO 나노시트
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L
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이근형
Korean J. Met. Mater.
2022;60(10):769-773. Published online 2022 Sep 29
DOI:
https://doi.org/10.3365/KJMM.2022.60.10.769
Abstract
Ultrathin MgO nanosheets were successfully synthesized by thermal evaporation of a mixture of Mg and graphite powders as the source material. The synthesis was performed at 1000
o
C in air. Scanning electron microscopy showed that the two-dimensional MgO nanosheets had widths of several micrometers and the thickness of less than.....
More
Web of Science 2
Crossref 2
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Korean J. Met. Mater.
2022;60(10):732-743. Published online 2022 Sep 29
DOI:
https://doi.org/10.3365/KJMM.2022.60.10.732
Abstract
Silica fibers were fabricated by sol-gel reaction and an electrospinning process. A high voltage source of electricity was applied to the prepared spinning solution to form the fibers. Macroporous silica fibers were prepared using polystyrene (PS) nanospheres as templates after calcination. The pore size could be controlled by adjusting the.....
More
Web of Science 3
Crossref 3
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DIC를 활용한 선압축과 후열처리 공정을 거친 AZ31 마그네슘 압연재의 인장 변형 거동 분석
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P
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이교명, 김정은, 박성혁
Korean J. Met. Mater.
2022;60(9):701-712. Published online 2022 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2022.60.9.701
Abstract
This study investigates the effects of precompression and subsequent annealing on the tensile deformation behavior of a rolled AZ31 Mg alloy at room temperature using digital image correlation (DIC). When the as-rolled sample (AR sample) is subjected to precompresssion along the rolling direction (RD) and transverse direction (TD), the sample’s.....
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Web of Science 1
Crossref 1
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김기범, 최택집, 이태경,
Korean J. Met. Mater.
2022;60(9):654-667. Published online 2022 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2022.60.9.654
Abstract
This study investigated the microstructure and mechanical properties of Mg-1Gd-1Y-1Zn (at.%) alloys containing designed amounts of Ce or La. The Mg
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(Gd,Zn) phase formed in the as-cast Mg-Gd-Y-Zn-Ce/La alloys and disappeared after a homogenization treatment at 500°C for 24 h. The addition of Ce and La resulted in the formation of.....
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대기압의 공기 분위기에서 열증발법에 의해 성장한 육각형 디스크 형상의 ZnO 나노결정
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이근형
Korean J. Met. Mater.
2022;60(8):601-606. Published online 2022 Jul 12
DOI:
https://doi.org/10.3365/KJMM.2022.60.8.601
Abstract
Hexagonal-shaped ZnO nanodisks were synthesized at temperatures above 1000oC via thermal evaporation of a mixture of ZnO, SnO, and graphite powders as the source materials. Notably, the ZnO nanodisks were easily formed in ambient air at atmospheric pressure. The ZnO nanodisks could not be obtained without SnO in the source.....
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수소 저장용 다공성 제올라이트 탐색을 위한 고속 대량 스크리닝 계산
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여병철
Korean J. Met. Mater.
2022;60(7):537-544. Published online 2022 Jun 3
DOI:
https://doi.org/10.3365/KJMM.2022.60.7.537
Abstract
Hydrogen is considered an attractive energy resource because it is eco-friendly in contrast with fossil fuels. Hydrogen storage remains as essential technology for increasing the use of the hydrogen in applications such as hydrogen vehicles and fuel cells. Hydrogen storage requires retaining a high density of hydrogen molecules at ambient.....
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