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1. Crystal structure of the [(THF)Cs(μ-η ⁵ :η ⁵ -Cp′) ₃ Yb] _n oligomer

   https://doi.org/10.1107/S2056989020008051  

   Huh, Daniel N. ; Ziller, Joseph W. ; Evans, William J. ( July 2020 , Acta Crystallographica Section E Crystallographic Communications)

   The green compound poly[(tetrahydrofuran)tris[μ-η 5 :η 5 -1-(trimethylsilyl)cyclopentadienyl]caesium(I)ytterbium(II)], [CsYb(C 8 H 13 Si) 3 (C 4 H 8 O)] n or [(THF)Cs(μ-η 5 :η 5 -Cp′) 3 Yb II ] n was synthesized by reduction of a red THF solution of (C 5 H 4 SiMe 3 ) 3 Yb III with excess Cs metal and identified by X-ray diffraction. The compound crystallizes as a two-dimensional array of hexagons with alternating Cs I and Yb II ions at the vertices and cyclopentadienyl groups bridging each edge. This, based off the six-electron cyclopentadienyl rings occupying three coordination positions, gives a formally nine-coordinate tris(cyclopentadienyl) coordination environment to Yb and the Cs is ten-coordinate due to the three cyclopentadienyl rings and a coordinated molecule of THF. The complex comprises layers of Cs 3 Yb 3 hexagons with THF ligands and Me 3 Si groups in between the layers. The Yb—C metrical parameters are consistent with a 4 f 14 Yb II electron configuration.
2. Single-Source Vapor Deposition of Quantum-Cutting Yb ³⁺ :CsPb(Cl _1–x Br _x ) ₃ and Other Complex Metal-Halide Perovskites

   https://doi.org/10.1021/acsaem.9b00910  

   Crane, Matthew J. ; Kroupa, Daniel M. ; Roh, Joo Yeon ; Anderson, Rayne T. ; Smith, Matthew D. ; Gamelin, Daniel R. ( May 2019 , ACS Applied Energy Materials)
3. Hydrothermal Synthesis of Yb ³⁺ : LuLiF ₄ Microcrystals and Laser Refrigeration of Yb ³⁺ : LuLiF ₄ /Silicon‐Nitride Composite Nanostructures

   https://doi.org/10.1002/lpor.202100019  

   Dobretsova, Elena A. ; Xia, Xiaojing ; Pant, Anupum ; Lim, Matthew B. ; De Siena, Michael C. ; Boldyrev, Kirill N. ; Molchanova, Anastasia D. ; Novikova, Nadezhda N. ; Klimin, Sergei A. ; Popova, Marina N. ; et al ( October 2021 , Laser & Photonics Reviews)
4. The impact of site selectivity and disorder on the thermoelectric properties of Yb ₂₁ Mn ₄ Sb ₁₈ solid solutions: Yb ₂₁ Mn _4−x Cd _x Sb ₁₈ and Yb _21−y Ca _y Mn ₄ Sb ₁₈

   https://doi.org/10.1039/d1ma00497b  

   He, Allan ; Cerretti, Giacomo ; Kauzlarich, Susan M. ( August 2021 , Materials Advances)

   Thermoelectric materials can convert heat into electricity. They are used to generate electricity when other power sources are not available or to increase energy efficiency by recycling waste heat. The Yb 21 Mn 4 Sb 18 phase was previously shown to have good thermoelectric performance due to its large Seebeck coefficient (∼290 μV K −1 ) and low thermal conductivity (0.4 W m −1 K −1 ). These characteristics stem respectively from the unique [Mn 4 Sb 10 ] 22− subunit and the large unit cell/site disorder inherent in this phase. The solid solutions, Yb 21 Mn 4− x Cd x Sb 18 ( x = 0, 0.5, 1.0, 1.5) and Yb 21− y Ca y Mn 4 Sb 18 ( y = 3, 6, 9, 10.5) have been prepared, their structures characterized and thermoelectric properties from room temperature to 800 K measured. A detailed look into the structural disorder for the Cd and Ca solid solutions was performed using synchrotron powder X-ray diffraction and pair distribution function methods and shows that these are highly disordered structures. The substitution of Cd gives rise to more metallic behavior whereas Ca substitution results in high resistivity. As both Cd and Ca aremore »isoelectronic substitutions, the changes in properties are attributed to changes in the electronic structure. Both solid solutions show that the thermal conductivities remain extremely low (∼0.4 W m −1 K −1 ) and that the Seebeck coefficients remain high (>200 μV K −1 ). The temperature dependence of the carrier mobility with increased Ca substitution, changing from approximately T −1 to T −0.5 , suggests that another scattering mechanism is being introduced. As the bonding changes from polar covalent with Yb to ionic for Ca, polar optical phonon scattering becomes the dominant mechanism. Experimental studies of the Cd solid solutions result in a max zT of ∼1 at 800 K and, more importantly for application purposes, a ZT avg ∼ 0.6 from 300 K to 800 K.« less
5. Yb- and Mn-Doped Lead-Free Double Perovskite Cs ₂ AgBiX ₆ (X = Cl ^– , Br ^– ) Nanocrystals

   https://doi.org/10.1021/acsami.9b02367  

   Chen, Na ; Cai, Tong ; Li, Wenhao ; Hills-Kimball, Katie ; Yang, Hanjun ; Que, Meidan ; Nagaoka, Yasutaka ; Liu, Zhenyang ; Yang, Dong ; Dong, Angang ; et al ( April 2019 , ACS Applied Materials & Interfaces)