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Skutterudite: Reproducibility of Thermoelectric Performance of P-type RyFe4-xCoxSb12 Bulky Compacts
Jin-Sol Kim, Dong-Kil Shin, Kwan-Ho Park, Il-Ho Kim
Korean J. Met. Mater. 2024;62(7):542-549.   Published online 2024 Jun 28
DOI: https://doi.org/10.3365/KJMM.2024.62.7.542

Abstract
Skutterudite compounds have excellent thermoelectric performance in the intermediate-to high temperature range. Their lattice thermal conductivity can be reduced by intensifying phonon scattering through independent vibrations of the guest atoms, by filling the voids within the lattice. Furthermore, the thermoelectric figure of merit (ZT) can be enhanced by optimizing the..... More

                   Web of Science 1  Crossref 1
Thermoelectric Chalcostibite: Solid-State Synthesis and Thermal Properties
Dong Hwi Kim, Sang Yun, Il-Ho Kim
Korean J. Met. Mater. 2024;62(6):480-486.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.480

Abstract
In this study, thermoelectric chalcostibite (CuSbS2) compounds were fabricated using mechanical alloying (MA) and hot pressing (HP), and phase identification, microstructural observation, and thermal analysis were conducted. The thermal properties were then measured and compared with those of other Cu–Sb–S ternary compounds synthesized by the same solid-state process, namely, skinnerite..... More

                
Uniformity of Thermoelectric Properties of N-type Bi2Te3-ySey Bulky Compacts
Se-Hyeon Choi, Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2024;62(5):385-392.   Published online 2024 May 5
DOI: https://doi.org/10.3365/KJMM.2024.62.5.385

Abstract
Because n-type Bi2Te3-based materials exhibit lower thermoelectric performance than p-type materials and because their thermoelectric properties are sensitively changed by the composition and carrier concentration, optimizing these aspects in n-type materials is necessary to improve the thermoelectric figure of merit (ZT). In this study, the thermoelectric performance of n-type Bi2Te3-based..... More

                
Effects of Double Doping Germanium and Indium on the Thermoelectric Properties of Permingeatite
Bong-Ki Hong, Il-Ho Kim
Korean J. Met. Mater. 2023;61(7):489-499.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.489

Abstract
Cu3Sb1–x–yGexInySe4 (0.02 ≤ x ≤ 0.12; 0.04 ≤ y ≤ 0.08) permingeatite compounds doped with Ge and In were prepared using solid-state synthesis. The phases and microstructures were analyzed, and the charge transport and thermoelectric properties were evaluated according to the Ge and In doping content. Most of the samples..... More

                   Web of Science 1  Crossref 1
Improved Thermoelectric Performance of Cu3Sb1−x−ySnxInySe4 Permingeatites Double-Doped with Sn and In
Ho-Jeong Kim, Il-Ho Kim
Korean J. Met. Mater. 2023;61(6):422-430.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.422

Abstract
Cu–Sb–Se ternary chalcogenide compounds composed of earth-abundant low-toxicity elements are attracting attention as economical and ecofriendly semiconductors. Among them, permingeatite (Cu3SbSe4) is a potential thermoelectric material with high Seebeck coefficient and low lattice thermal conductivity. However, it is necessary to improve its thermoelectric properties through doping, as it has low..... More

                
Bytizite Cu3SbSe3: Solid-State Synthesis and Thermoelectric Performance
Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2023;61(5):363-370.   Published online 2023 Apr 20
DOI: https://doi.org/10.3365/KJMM.2023.61.5.363

Abstract
Bytizite (Cu3SbSe3 ) has attracted interest as a promising thermoelectric material because of its ultralow thermal conductivity; however, there are few experimental studies. This study investigated the optimal processing conditions for the synthesis of Cu3SbSe3 using mechanical alloying (MA) and hot pressing (HP). The MA powder exhibited an orthorhombic Cu3SbSe3..... More

                
Effects of Sn and In Double-Doping on the Thermoelectric Performance of Cu3Sb1-x-ySnxInyS4 Famatinites
Sang Yun, Il-Ho Kim
Korean J. Met. Mater. 2023;61(5):355-362.   Published online 2023 Apr 20
DOI: https://doi.org/10.3365/KJMM.2023.61.5.355

Abstract
Famatinite (Cu3SbS4 ) is a promising p-type thermoelectric material because of its low lattice thermal conductivity and high Seebeck coefficient. In this study, famatinite powders, double-doped with Sn (a BIV group element) and In (a BIII group element) to give Cu3Sb1-x-ySnxInyS4 (0.02 ≤ x ≤ 0.12 and 0.06 ≤..... More

                   Web of Science 1  Crossref 2
Phase, Crystal Structure, and Thermoelectric Performance of Cubic Skinnerite Cu3Sb1-yFeyS3 Synthesized by Mechanical Alloying
Sang Jun Park, Il-Ho Kim
Korean J. Met. Mater. 2023;61(4):277-283.   Published online 2023 Mar 22
DOI: https://doi.org/10.3365/KJMM.2023.61.4.277

Abstract
Skinnerite (Cu3SbS3) has recently attracted attention as a promising thermoelectric material because of its low thermal conductivity. In this study, we performed the solid-state synthesis of Fe-doped skinnerite Cu3Sb1-yFeyS3 (y = 0.02−0.06) using mechanical alloying and hot pressing, and examined the samples’ thermoelectric properties relative to Fe doping content. All..... More

                
Solid-State Synthesis and Thermoelectric Performance of Cu3Sb1−yBIII ySe4 (BIII = Al, In) Permingeatites
Ho-Jeong Kim, Il-Ho Kim
Korean J. Met. Mater. 2023;61(4):269-276.   Published online 2023 Mar 22
DOI: https://doi.org/10.3365/KJMM.2023.61.4.269

Abstract
Permingeatite (Cu3SbSe4) is a promising thermoelectric material with narrow bandgap energy and large carrier effective mass. However, doping is required to improve its electrical conductivity and thermoelectric properties. In this study, Cu3Sb1−y(Al/In)ySe4 doped with BIII-group elements (Al or In) at the Sb sites was synthesized using mechanical alloying followed by..... More

                   Web of Science 1  Crossref 1
Enhanced Thermoelectric Performance of Sn-Doped Permingeatites Cu3Sb1-ySnySe4
Ji-Hee Pi, Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2023;61(1):46-53.   Published online 2022 Dec 28
DOI: https://doi.org/10.3365/KJMM.2023.61.1.46

Abstract
In this study, Cu3Sb1-ySnySe4 (0 ≤ y ≤ 0.08) permingeatites were synthesized via mechanical alloying followed by hot pressing. The phase transformation, microstructure, charge transport parameters of the permingeatites, and their thermoelectric properties were analyzed. The permingeatites were present in a single phase with a tetragonal structure, and secondary phases..... More

                
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

                   Web of Science 3  Crossref 3
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

                   Web of Science 5  Crossref 5
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

                
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

                   Web of Science 2  Crossref 2
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

                
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

                   Crossref 4
Electronic Transport and Thermoelectric Properties of Te-Doped Tetrahedrites Cu12Sb4-yTeyS13
Sung-Gyu Kwak, Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2021;59(8):560-566.   Published online 2021 Jul 5
DOI: https://doi.org/10.3365/KJMM.2021.59.8.560

Abstract
Tetrahedrite is a promising thermoelectric material mainly due to its low thermal conductivity, a consequence of its complicated crystal structure. However, tetrahedrite has a high hole concentration; therefore, optimizing carrier concentration through doping is required to maximize the power factor. In this study, Te-doped tetrahedrites Cu12Sb4-yTeyS13 (0.1 ≤ y ≤..... More

                   Crossref 1
Effects of Ge Doping on the Charge Transport and Thermoelectric Properties of Permingeatites Cu3Sb1−yGeySe4
Ji-Hee Pi, Go-Eun Lee,, Il-Ho Kim
Korean J. Met. Mater. 2021;59(6):422-429.   Published online 2021 May 26
DOI: https://doi.org/10.3365/KJMM.2021.59.6.422

Abstract
Permingeatites Cu3Sb1−yGeySe4 (0 ≤ y ≤ 0.14) were synthesized by mechanical alloying and hot pressing. The charge-transport parameters (Hall coefficient, carrier concentration, mobility, and Lorenz number) and thermoelectric properties (electrical conductivity, Seebeck coefficient, power factor, thermal conductivity, and figure of merit) were examined with respect to the Ge doping level...... More

                   Web of Science 8  Crossref 6
Charge Transport and Thermoelectric Properties of Mn-Doped Tetrahedrites Cu12-xMnxSb4S13
Sung-Yoon Kim, Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2021;59(5):329-335.   Published online 2021 Apr 6
DOI: https://doi.org/10.3365/KJMM.2021.59.5.329

Abstract
Mn-doped tetrahedrites Cu12-xMnxSb4S13 (0.1 ≤ x ≤ 0.4) were synthesized by mechanical alloying (MA) and sintered by hot pressing (HP). A single tetrahedrite phase was synthesized by MA without post-annealing, and it was stable without any phase changes after HP. The hot-pressed specimens had a relative density higher than 98.6%...... More

                   Web of Science 1  Crossref 1
Effects of Charge Compensation on the Thermoelectric Properties of (La1-zCez)0.8Fe4-xCoxSb12 Skutterudites
Kyung-Wook Jang, Ye-Eun Cha, Deok-Yeong Choi, Sunuk Kim, Won-Seon Seo, Kyu Hyoung Lee, Il-Ho Kim
Korean J. Met. Mater. 2021;59(4):239-246.   Published online 2021 Mar 24
DOI: https://doi.org/10.3365/KJMM.2021.59.4.239

Abstract
La/Ce-partially double-filled and Co-charge-compensated (La1−zCez)0.8Fe4−xCoxSb12 skutterudites were synthesized, and their thermoelectric properties were studied by varying the filling ratio and charge compensation. X-ray diffraction analysis revealed that the matrix phase was skutterudite and a secondary phase was determined to the marcasite FeSb2. However, the formation of marcasite could be inhibited..... More

                   Web of Science 2  Crossref 2
Synthesis of Fe-Doped Tetrahedrites Cu12-xFexSb4S13 and Characterization of Their Thermoelectric Properties
Sung-Yoon Kim, Ji-Hee Pi, Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2020;58(5):340-347.   Published online 2020 Apr 20
DOI: https://doi.org/10.3365/KJMM.2020.58.5.340

Abstract
Tetrahedrite (C12Sb4S13) has attracted attention as a p-type thermoeletric material with very low thermal conductivity induced by the anharmonic oscillation of Cu due to the lone-pair electrons of Sb. Many studies have been conducted to improve its thermoelectric performance by partially substituting the transition elements for the Cu sites. In..... More

                   Web of Science 9  Crossref 10
Solid-State Synthesis and Thermoelectric Properties of Tetrahedrites Cu12Sb4-yBiyS13
Sung-Gyu Kwak, Ji-Hee Pi, Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2020;58(4):272-277.   Published online 2020 Mar 9
DOI: https://doi.org/10.3365/KJMM.2020.58.4.272

Abstract
Tetrahedrite has low lattice thermal conductivity because of the lone-pair electrons of Sb, which cause the Cu atoms to vibrate at a low frequency and high amplitude. The synthesis of tetrahedrite compounds by conventional melting methods requires a long-time reaction and annealing. However, a homogeneous and solid-state synthesis can be..... More

                   Web of Science 18  Crossref 18
Synthesis and Thermoelectric Properties of Partially Double-Filled Skutterudites (La1−zYbz)0.8Fe4−xCoxSb12
Ye-Eun Cha, Il-Ho Kim
Korean J. Met. Mater. 2019;57(12):801-807.   Published online 2019 Nov 22
DOI: https://doi.org/10.3365/KJMM.2019.57.12.801

Abstract
Partially double-filled skutterudites were prepared via encapsulated melting and hot pressing processes. The skutterudite phase was successfully synthesized through partial double filling of La/Yb and substitution of Co. A small quantity of secondary phase (marcasite FeSb2) was formed, but its formation was suppressed by increasing Co charge compensation. The marcasite..... More

                   Crossref 2
Synthesis and Thermoelectric Properties of (La1−zNdz)0.8Fe4−xCoxSb12 Skutterudites
Ye-Eun Cha, Il-Ho Kim
Korean J. Met. Mater. 2019;57(6):366-373.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.366

Abstract
p-Type (La1−zNdz)0.8Fe4−xCoxSb12 skutterudites were prepared by partial double filling with La/Nd and charge compensation by substituting Co for Fe. The skutterudite phase was successfully synthesized using encapsulated melting, quenching, annealing and hot-pressing processes, but a small amount of the marcasite phase was identified. Partial filling within the filling fraction limit..... More

                   Web of Science 4  Crossref 3
Electronic Transport and Thermoelectric Properties of Cu12-xZnxSb4S13 Tetrahedrites Prepared by Mechanical Alloying and Hot Pressing
Sung-Gyu Kwak, Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2019;57(5):328-333.   Published online 2019 Apr 10
DOI: https://doi.org/10.3365/KJMM.2019.57.5.328

Abstract
Tetrahedrite Cu12Sb4S13 has low lattice thermal conductivity because of the lone-pair electrons of Sb, which cause the Cu atoms to vibrate at a low frequency and high amplitude. When the Cu atoms of Cu12Sb4S13 are partially substituted with a transition metal, changes in the Cu vibrations can intensify phonon scattering,..... More

                   Web of Science 8  Crossref 6
Thermoelectric Properties of MnSi1.74-1.75:Gem Prepared by Solid-State Reaction and Hot Pressing
In-Jae Lee, Sol-Bin Park, Soon-Chul Ur, Kyung-Wook Jang, Il-Ho Kim
Korean J. Met. Mater. 2019;57(4):264-269.   Published online 2019 Apr 5
DOI: https://doi.org/10.3365/KJMM.2019.57.4.264

Abstract
Higher manganese silicides (HMSs) MnSi1.74-1.75:Gem (m = 0.01–0.04) were prepared by solid-state reaction and hot pressing. The major phases of the HMSs were Mn27Si47 or Mn4Si7, and a small quantity of Si remained, but the intermetallic compound MnSi was not formed. The lattice constant increased with the substitution of Ge..... More

                   Web of Science 3  Crossref 3
Thermoelectric Properties of P-type (Ce1-zYbz)0.8Fe4-xCoxSb12 Skutterudites
Deok-Yeong Choi, Ye-Eun Cha, Il-Ho Kim
Korean J. Met. Mater. 2018;56(11):822-828.   Published online 2018 Nov 5
DOI: https://doi.org/10.3365/KJMM.2018.56.11.822

Abstract
P-type Ce/Yb-filled skutterudites were synthesized, and their charge transport and thermoelectric properties were investigated with partial double filling and charge compensation. In the case of (Ce1-zYbz)0.8Fe4Sb12 without Co substitution, the marcasite (FeSb2) phase formed alongside the skutterudite phase, but the generation of the marcasite phase was inhibited by increasing Co..... More

                   Crossref 1
Charge Transport and Thermoelectric Properties of (La1−zPrz)0.8Fe4−xCoxSb12 Skutterudites
Ye-Eun Cha, Il-Ho Kim
Korean J. Met. Mater. 2018;56(10):772-778.   Published online 2018 Oct 5
DOI: https://doi.org/10.3365/KJMM.2018.56.10.772

Abstract
Partially La/Pr-double-filled and Co-substituted (La1−zPrz)0.8Fe4−xCoxSb12 skutterudites were synthesized by encapsulated melting and vacuum hot pressing. (La,Pr)Sb2 phases were not formed because the partial filling did not exceed the filling fraction limit, and the amount of secondary phase FeSb2 also decreased as the Co content increased. Electrical conductivity decreased with increasing..... More

                   Crossref 3
Thermoelectric Properties of Ge-doped Higher Manganese Silicides MnSi1.72-1.73:Gem
Sol-Bin Park, In-Jae Lee, Il-Ho Kim
Korean J. Met. Mater. 2018;56(9):693-698.   Published online 2018 Sep 5
DOI: https://doi.org/10.3365/KJMM.2018.56.9.693

Abstract
Ge-doped higher manganese silicides (HMSs) MnSi1.72–1.73:Gem (m = 0.01-0.04) were prepared and their thermoelectric properties were studied. HMS powders were synthesized by solid-state reaction of raw material powders (Mn, Si, and Ge) at 1273 K for 6 h in vacuum, and hot-pressed at 1173 K for 2 h under 70..... More

                   Crossref 5
Charge Transport and Thermoelectric Properties of N-type Bi2-xSbxTe3-ySey:Im Prepared by Encapsulated Melting and Hot Pressing
Woo-Jin Jung, Hyeok-Jin Kim, Il-Ho Kim
Korean J. Met. Mater. 2018;56(7):544-550.   Published online 2018 Jul 5
DOI: https://doi.org/10.3365/KJMM.2018.56.7.544

Abstract
Iodine-doped n-type Bi2-xSbxTe3-ySey:Im (x = 0.1–0.2, y = 0.15–0.6, and m = 0.0025–0.005) quaternary solid solutions were prepared by encapsulated melting (EM) and hot pressing (HP). The lattice constants of the resulting materials decreased with increasing Sb and Se contents, whereas the amount of I dopant was too small to..... More

                   Crossref 8
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