Molten Salt Synthesis of Nanolaminated Sc<sub>2</sub>SnC MAX Phase

李友兵,; 秦彦卿,; 陈科,; 陈露,; 张霄,; 丁浩明,; 李勉,; 张一鸣,; 都时禹,; 柴之芳,; 黄庆,

doi:10.15541/jim20200529

Cited by 22 publications

(7 citation statements)

References 40 publications

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“…The XRD pattern of the product, obtained through experimental measurements and Rietveld refinement, is depicted in Figure 1a, which found that the X-ray diffraction (XRD) of the product shares similarities with the previously reported Sc 2 SnC MAX phase. 43 This indicates the synthesis of a 211-type Sc 2 GaC MAX phase. Notably, significant changes in the intensity of the (002), (004), and (006) crystal planes were observed, suggesting a preferential growth on the 00l crystal planes.…”

Section: Resultsmentioning

confidence: 93%

“…In 2021, a Sc 2 SnC MAX phase was synthesized, representing the initial ternary Sc-based MAX phase. 43,44 This achievement has provided a path for further research and synthesis of ternary Sc-based MAX phases. Furthermore, the physical properties of MAX phases are significantly influenced by the presence of abundant A-site elements (e.g., Al, Si, Ga, In, and Sn).…”

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confidence: 93%

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Regulating the Electronic Structure of MAX Phases Based on Rare Earth Element Sc to Enhance Electromagnetic Wave Absorption

Li,

Wei,

Chen

et al. 2024

ACS Nano

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MAX phases are highly promising materials for electromagnetic (EM) wave absorption because of their specific combination of metal and ceramic properties, making them particularly suitable for harsh environments. However, their higher matching thickness and impedance mismatching can limit their ability to attenuate EM waves. To address this issue, researchers have focused on regulating the electronic structure of MAX phases through structural engineering. In this study, we successfully synthesized a ternary MAX phase known as Sc2GaC MAX with the rare earth element Sc incorporated into the M-site sublayer, resulting in exceptional conductivity and impressive stability at high temperatures. The Sc2GaC demonstrates a strong reflection loss (RL) of −47.7 dB (1.3 mm) and an effective absorption bandwidth (E AB) of 5.28 GHz. It also achieves effective absorption of EM wave energy across a wide frequency range, encompassing the X and Ku bands. This exceptional performance is observed within a thickness range of 1.3 to 2.1 mm, making it significantly superior to other Ga-MAX phases. Furthermore, Sc2GaC exhibited excellent absorption performance even at elevated temperatures. After undergoing oxidation at 800 °C, it achieves a minimum RL of −28.3 dB. Conversely, when treated at 1400 °C under an argon atmosphere, Sc2GaC demonstrates even higher performance, with a minimum RL of −46.1 dB. This study highlights the potential of structural engineering to modify the EM wave absorption performance of the MAX phase by controlling its intrinsic electronic structure.

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Section: Resultsmentioning

confidence: 93%

mentioning

confidence: 93%

Regulating the Electronic Structure of MAX Phases Based on Rare Earth Element Sc to Enhance Electromagnetic Wave Absorption

Li,

Wei,

Chen

et al. 2024

ACS Nano

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“…Zhao et al determined the interesting electrochemical performance of Nb 2 SnC in Li-ion electrolytes, which has sparked great interest in the scientific community for Sn-containing MAX phases. Following this report, two Sn-based MAX phases were synthesized, and lithiation in the Sn-based 211 MAX phases was performed theoretically. − Moreover, a set of theoretical studies have reported different physical properties of Sn-based MAX phases. The structural, electronic, mechanical and lattice dynamical properties of Sc 2 SnC, including defect processes, in comparison to those of existing M 2 SnC MAX phases are reported in a recent study .…”

Section: Introductionmentioning

confidence: 99%

Optical Response, Lithium Doping, and Charge Transfer in Sn-Based 312 MAX Phases

et al. 2023

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The optical response, lithium doping, and charge transfer in three Sn-based existing M 3 SnC 2 MAX phases with electron localization function (ELF) were investigated using density functional theory (DFT). Optical calculations show a slight optical anisotropy in the spectra of different optical parameters in some energy ranges of the incident photons. The peak height is mostly slightly higher for the polarization ⟨001⟩. The highest peak shifts toward higher energy when the M-element Ti is replaced by Zr and then by Hf. Optical conductivity, refractive index, extinction coefficient, and dielectric functions reveal the metallic nature of Ti 3 SnC 2 , Zr 3 SnC 2 , and Hf 3 SnC 2 . The plasma frequencies of these materials are very similar for two different polarizations and are 12.97, 13.56, and 14.46 eV, respectively. The formation energies of Li-doped Zr 3 SnC 2 and Hf 3 SnC 2 are considerably lower than those of their Li-doped 211 MAX phase counterparts Zr 2 SnC and Hf 2 SnC. Consistently, the formation energy of Li-doped Ti 3 SnC 2 is lower than that of the corresponding 2D MXene Ti 3 C 2 , which is a promising photothermal material. The Bader charge is higher in magnitude than the Mulliken and Hirschfeld charges. The highest charge transfer occurs in Zr 3 SnC 2 and the lowest charge transfer occurs in Ti 3 SnC 2 . ELF reveals that the bonds between carbon and metal ions are strongly localized, whereas in the case of Sn and metal ions, there is less localization which is interpreted as a weak bond.

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“…In an article published in mid-2019, this number was reported as 82 on the MAX phase list . After publishing this list, the newly synthesized MAX phases are Nb 2 SB, Zr 2 SB, Hf 2 SB, Sc 2 SnC, Ta 2 FeC, Ti 2 FeN, Nb 2 FeC, Zr 2 SeC, Hf 2 SeC, Hf 2 SeB, Zr 2 SeB, Hf 2 TeB, and Sc 2 PbC. − It is noteworthy that common elements have been replaced with unusual elements at any one or more of the M, A, and X-sites of these new MAX phases. Hf 2 TeB is the most recent compound synthesized in the 211 MAX family within the Hf–A–B system .…”

Section: Introductionmentioning

confidence: 99%

Role of Chalcogen Atoms as an A-Site Element on the Physical Properties of 211 MAX Phases in the Hf–A–B System

Hadi

2023

J. Phys. Chem. C

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The dual character of MAX phases with ceramic and metallic properties and their numerous technological applications continue to increase the attention of materials scientists towards them. The recent synthesis of boride MAX phases with chalcogen atoms at the A-site is an important addition to the MAX phase family and has further expanded the diversity of the physical properties of this family. Here, density functional theory calculations were employed to understand the role of chalcogen atoms at the A-site on the structural, mechanical, lattice dynamic, thermal, electronic, and optical properties of Hf 2 SB, Hf 2 SeB, and Hf 2 TeB. In the Hf−A−B system of the 211 MAX family, most of the physical properties decrease as the chalcogen atom A moves from S to Te via Se, while the lattice parameters show a gradual increase. All compounds under study are brittle in nature. Their elastic, electronic, and optical properties exhibit an anisotropic nature. They have the potential to be etched into two-dimensional MXenes and become thermal barrier coating materials. Also, they will reduce solar heating when used as a coating material.

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Molten Salt Synthesis of Nanolaminated Sc₂SnC MAX Phase

Cited by 22 publications

References 40 publications

Regulating the Electronic Structure of MAX Phases Based on Rare Earth Element Sc to Enhance Electromagnetic Wave Absorption

Regulating the Electronic Structure of MAX Phases Based on Rare Earth Element Sc to Enhance Electromagnetic Wave Absorption

Optical Response, Lithium Doping, and Charge Transfer in Sn-Based 312 MAX Phases

Role of Chalcogen Atoms as an A-Site Element on the Physical Properties of 211 MAX Phases in the Hf–A–B System

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Molten Salt Synthesis of Nanolaminated Sc2SnC MAX Phase

Cited by 22 publications

References 40 publications

Regulating the Electronic Structure of MAX Phases Based on Rare Earth Element Sc to Enhance Electromagnetic Wave Absorption

Regulating the Electronic Structure of MAX Phases Based on Rare Earth Element Sc to Enhance Electromagnetic Wave Absorption

Optical Response, Lithium Doping, and Charge Transfer in Sn-Based 312 MAX Phases

Role of Chalcogen Atoms as an A-Site Element on the Physical Properties of 211 MAX Phases in the Hf–A–B System

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Molten Salt Synthesis of Nanolaminated Sc₂SnC MAX Phase