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Preparation and Thermoelectric Properties of Si-Doped Tetrahedrites Cu<sub>12</sub>Sb<sub>4-y</sub>Si<sub>y</sub>S<sub>13</sub>
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

                        
Solid-State Synthesis and Thermoelectric Properties of Ge-Doped Tetrahedrites Cu<sub>12</sub>Sb<sub>4-y</sub>Ge<sub>y</sub>S<sub>13</sub>
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 Cu<sub>12</sub>Sb<sub>4-y</sub>Sn<sub>y</sub>S<sub>13</sub>
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
Electronic Transport and Thermoelectric Properties of Te-Doped Tetrahedrites Cu<sub>12</sub>Sb<sub>4-y</sub>Te<sub>y</sub>S<sub>13</sub>
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

                           Cited By 1
Charge Transport and Thermoelectric Properties of Mn-Doped Tetrahedrites Cu<sub>12-x</sub>Mn<sub>x</sub>Sb<sub>4</sub>S<sub>13</sub>
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

                        
Synthesis of Fe-Doped Tetrahedrites Cu<sub>12-x</sub>Fe<sub>x</sub>Sb<sub>4</sub>S<sub>13</sub> 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

                           Cited By 7
Solid-State Synthesis and Thermoelectric Properties of Tetrahedrites Cu<sub>12</sub>Sb<sub>4-y</sub>Bi<sub>y</sub>S<sub>13</sub>
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

                           Cited By 15
Electronic Transport and Thermoelectric Properties of Cu<sub>12-x</sub>Zn<sub>x</sub>Sb<sub>4</sub>S<sub>13</sub> 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

                           Cited By 5
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