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Synthesis of Polycrystalline Bi-Doped Snse by Mechanical Alloying and Hydrogen Reduction

Jin Kwang Jang Jaeyun Moon Jongmin Byun

Archives of Metallurgy and Materials | 2024 | vol. 69 | No 1 | 129-133 | DOI: 10.24425/amm.2024.147800

Keywords SnSe Thermoelectric Properties Hydrogen reduction N-type Bi2O3

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Abstract

In this study, Bi-doped SnSe was fabricated through the high energy ball milling and the hydrogen reduction of Bi2O3, and its thermoelectric properties were analyzed. The specimen with pure-Bi was fabricated as a control group and properties were compared. In the case of specimens with added Bi2O3, when sintering was performed in a hydrogen atmosphere, Bi2O3 with a high melting point was reduced to Bi with a relatively low melting point. At this time, because of the appearance of the liquid phase, the orientation of the (400) plane increased, and the density was improved. As a result, the change of SnSe to n-type was confirmed in the temperature range of 300 K - 773 K due to Bi doping. Additionally, when Bi2O3 was used instead of pure-Bi, the thermal conductivity, which is inversely proportional to the figure of merit, decreased, and the electrical conductivity increased, resulting in an improvement in the figure of merit.

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Authors and Affiliations

Jin Kwang Jang

e-mail:

ORCID:

Jaeyun Moon

e-mail:

ORCID:

Jongmin Byun

1 3

e-mail:

ORCID:

Seoul National University of Science and Technology, Department of Materials Science and Engineering, Seoul 01811, Republic of Korea
University of Nevada, Las Vegas, Department of Mechanical Engineering, 4505 S. Maryland Pkwy Las Vegas, Nv 89154, United States
Seoul National University of Science And Technology, The Institute of Powder Technology, Seoul 01811, Republic of Korea

Simple synthesis of Black TiO ₂ Nanofibers Via Calcination in Inert Atmosphere

Myeongjun Ji Eung Ryong Kim Mi-Jeong Park Hee Yeon Jeon Jaeyun Moon Jongmin Byun Young-In Lee

Archives of Metallurgy and Materials | 2022 | vol. 67 | No 4 | 1481-1486 | DOI: 10.24425/amm.2022.141078

Keywords Black TiO2 nanofibers electrospinning calcination atmosphere

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Abstract

Black TiO ₂nanofibers have recently emerged as a promising material that has both advantages of black metal oxide and one-dimensional nanostructure. However, current reduction-based synthesis approaches are not compatible with practical applications because these processes require high process costs, complicated processes, and sophisticated control. Therefore, it is still necessary to develop a simple and facile method that can easily introduce atomic defects during the synthesis process. This work suggests an electrospinning process with an antioxidant and subsequent calcination process for the facile synthesis of black TiO ₂ nanofibers. The synthesized black TiO ₂ nanofiber has an average diameter of 50.3 nm and a rutile structure. Moreover, this nanofiber represented a noticeable black color and a bandgap of 2.67 eV, clearly demonstrating the bandgap narrowing by the introduced atomic defects.

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Authors and Affiliations

Myeongjun Ji

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ORCID:

Eung Ryong Kim

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ORCID:

Mi-Jeong Park

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ORCID:

Hee Yeon Jeon

e-mail:

ORCID:

Jaeyun Moon

e-mail:

ORCID:

Jongmin Byun

e-mail:

ORCID:

Young-In Lee

e-mail:

ORCID:

Seoul National University of Science and Technology, Department of Materials Science and Engineering, Seoul, 01811, Republic of Korea
University of Nevada, Department of Mechanical Engineering, Las Vegas, 4505 S. Maryland PKWY Las Vegas, NV 89154, United States

Direct Energy Deposition of Mo Powder Prepared by Electrode Induction Melting Gas Atomization

Goo-Won Roh Eun-Soo Park Jaeyun Moon Hojun Lee Jongmin Byun

Archives of Metallurgy and Materials | 2021 | vol. 66 | No 3 | 795-798 | DOI: 10.24425/amm.2021.136382

Keywords Molybdenum powder Electrode induction melting gas atomization Direct Energy Deposition Porosity Hardness

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Abstract

Molybdenum (Mo) is used to form a barrier layer for metal wiring in displays or semiconductor devices. Recently, researches have been continuously attempted to fabricate Mo sputtering targets through additive manufacturing. In this study, spherical Mo powders with an average particle size of about 37 um were manufactured by electrode induction melting gas atomization. Subsequently, Mo layer with a thickness of 0.25 mm was formed by direct energy deposition in which the scan speed was set as a variable. According to the change of the scan speed, pores or cracks were found in the Mo deposition layer. Mo layer deposited with scan speed of 600 mm/min has the hardness value of 324 Hv with a porosity of approximately 2%. We demonstrated that Mo layers with higher relative density and hardness can be formed with less effort through direct energy deposition compared to the conventional powder metallurgy.

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Bibliography

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Authors and Affiliations

Goo-Won Roh

1 2

e-mail:

ORCID:

Eun-Soo Park

e-mail:

ORCID:

Jaeyun Moon

e-mail:

ORCID:

Hojun Lee

e-mail:

ORCID:

Jongmin Byun

e-mail:

ORCID:

University, Department of Materials Science and Engineering, Seoul 04763, Republic of Korea
Research and Development Center, Eloi Materials Lab (EML) Co. Ltd., Suwon 16229, Republic of Korea
University of Nevada, Department of Mechanical Engineering, Las Vegas, 4505 S. Maryland PKWY Las Vegas, NV 89154, United States
Seoul National University of Science and Technology, Department of Materials Science and Engineering Seoul 01811, Republic of Korea

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Synthesis of Polycrystalline Bi-Doped Snse by Mechanical Alloying and Hydrogen Reduction

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Authors and Affiliations

Simple synthesis of Black TiO 2 Nanofibers Via Calcination in Inert Atmosphere

Abstract

Authors and Affiliations

Direct Energy Deposition of Mo Powder Prepared by Electrode Induction Melting Gas Atomization

Abstract

Bibliography

Authors and Affiliations

Simple synthesis of Black TiO ₂ Nanofibers Via Calcination in Inert Atmosphere