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Yox P, Cerasoli F, Sarkar A, Kyveryga V, Viswanathan G, Donadio D, Kovnir K. New Trick for an Old Dog: From Prediction to Properties of "Hidden Clathrates" Ba 2Zn 5As 6 and Ba 2Zn 5Sb 6. J Am Chem Soc 2023; 145:4638-4646. [PMID: 36787623 DOI: 10.1021/jacs.2c12435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
The zinc-antimony phase space has been heavily investigated due to the structural complexity and abundance of high-performing thermoelectric materials. Consequentially, the desire to use zinc and antimony as framework elements to encage rattling cations and achieve phonon-glass-electron-crystal-type properties has remained an enticing goal with only two alkali metal clathrates to date, Cs8Zn18Sb28 and K58Zn122Sb207. Guided by Zintl electron-counting predictions, we explored the Ba-Zn-Pn (Pn = As, Sb) phase space proximal to the expected composition of the type-I clathrate. In situ powder X-ray diffraction studies revealed two "hidden" compounds which can only be synthesized in a narrow temperature range. The ex situ synthesis and crystal growth unveiled that instead of type-I clathrates, compositionally close but structurally different new clathrate-like compounds formed, Ba2Zn5As6 and Ba2Zn5Sb6. These materials crystallize in a unique structure, in the orthorhombic space group Pmna with the Wyckoff sequence i2h6gfe. Single-phase synthesis enabled the exploration of their transport properties. Rattling of the Ba cations in oversized cages manifested low thermal conductivity, which, coupled with the high Seebeck coefficients observed, are prerequisites for a promising thermoelectric material. Potential for further optimization of the thermoelectric performance by aliovalent doping was computationally analyzed.
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Affiliation(s)
- Philip Yox
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,U.S. Department of Energy, Ames National Laboratory, Ames, Iowa 50011, United States
| | - Frank Cerasoli
- Department of Chemistry, University of California, Davis, Davis, California 95616, United States
| | - Arka Sarkar
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,U.S. Department of Energy, Ames National Laboratory, Ames, Iowa 50011, United States
| | - Victoria Kyveryga
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Gayatri Viswanathan
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,U.S. Department of Energy, Ames National Laboratory, Ames, Iowa 50011, United States
| | - Davide Donadio
- Department of Chemistry, University of California, Davis, Davis, California 95616, United States
| | - Kirill Kovnir
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,U.S. Department of Energy, Ames National Laboratory, Ames, Iowa 50011, United States
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Courteau B, Gvozdetskyi V, Lee S, Cox T, Zaikina JV. Ternary antimonide NaCd4Sb3: Hydride synthesis, crystal structure and transport properties. Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202200095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | - Volodymyr Gvozdetskyi
- Iowa State University of Science and Technology: Iowa State University Chemistry 50011 Ames UNITED STATES
| | - Shannon Lee
- Iowa State University of Science and Technology: Iowa State University Chemistry 50011 Ames UNITED STATES
| | - Tori Cox
- Iowa State University of Science and Technology: Iowa State University Chemistry 50011 Ames UNITED STATES
| | - Julia V. Zaikina
- Iowa State University Chemistry 2415 Osborn Drive, 1605 Gilman Hall 50011-1021 Ames UNITED STATES
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Lee SJ, Won J, Wang LL, Jing D, Harmer CP, Mark J, Akopov G, Kovnir K. New Noncentrosymmetric Tetrel Pnictides Composed of Square-Planar Gold(I) with Peculiar Bonding. Chemistry 2021; 27:7383-7390. [PMID: 33523500 PMCID: PMC8251799 DOI: 10.1002/chem.202005312] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Indexed: 11/18/2022]
Abstract
Three novel isostructural equiatomic gold tetrel pnictides, AuSiAs, AuGeP, and AuGeAs, were synthesized and characterized. These phases crystallize in the noncentrosymmetric (NCS) monoclinic space group Cc (no. 9), featuring square‐planar Au within cis‐[AuTt2Pn2] units (Tt=tetrel, Si, Ge; Pn=pnictogen, P, As). This is in drastic contrast to the structure of previously reported AuSiP, which exhibits typical linear coordination of Au with Si and P. Chemical bonding analysis through the electron localization function suggests covalent two‐center two‐electron Tt−Pn bonds, and three‐center Au−Tt−Au and Au−Pn−Au bonds with 1.6 e− per bond. X‐ray photoelectron spectroscopy studies support the covalent and nonionic nature of Au−Pn and Au−Tt bonds. The title materials were found to be n‐type narrow‐gap semiconductors or semimetals, with nearly temperature‐independent electrical resistivities and low thermal conductivities. A combination of the semimetallic properties with tunable NCS structure provides opportunities for the development of materials based on gold tetrel pnictides.
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Affiliation(s)
- Shannon J Lee
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA.,U.S. Department of Energy, Ames Laboratory, Ames, IA, 50011, USA
| | - Juyeon Won
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA.,U.S. Department of Energy, Ames Laboratory, Ames, IA, 50011, USA
| | - Lin-Lin Wang
- U.S. Department of Energy, Ames Laboratory, Ames, IA, 50011, USA
| | - Dapeng Jing
- U.S. Department of Energy, Ames Laboratory, Ames, IA, 50011, USA.,Materials Analysis and Research Laboratory, Iowa State University, Ames, IA, 50011, USA
| | - Colin P Harmer
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA.,U.S. Department of Energy, Ames Laboratory, Ames, IA, 50011, USA
| | - Justin Mark
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA.,U.S. Department of Energy, Ames Laboratory, Ames, IA, 50011, USA
| | - Georgiy Akopov
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA.,U.S. Department of Energy, Ames Laboratory, Ames, IA, 50011, USA
| | - Kirill Kovnir
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA.,U.S. Department of Energy, Ames Laboratory, Ames, IA, 50011, USA
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