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1. Thermoelectric Properties of p‐ and n‐ type Eu ₅ Sn ₂ As ₆

   https://doi.org/10.1002/zaac.202100386  

   Devlin, Kasey P.; Gomez, Braulio; Kauzlarich, Susan M. (February 2022, Zeitschrift für anorganische und allgemeine Chemie)

   Abstract Eu₅Sn₂As₆is a Zintl phase crystalizing in the orthorhombic space groupPbamwith one‐dimensional chains of corner‐shared SnAs₄tetrahedra running in thec‐direction. Eu₅Sn₂As₆has an impressive room temperature Seebeck of >100 μV/K and < – 100 μV/K at 600 K crossing fromp‐ ton‐type at 650 K. The maximum thermoelectric figure of merit,zT, for Eu₅Sn₂As₆is small (0.075), comparable to that of the Zintl phase Ca₅Al₂Sb₆whose thermoelectric performance was improved by doping Na onto the Ca sites. In this study, we show that the thermoelectric properties of Eu₅Sn₂As₆can be improved by substituting with K or La. The series Eu_5‐xK_xSn₂As₆provides an increase in maximumzTof 0.22 forx=0.15 due to a decrease resistivity while the onset of bipolar conduction systematically increases in temperature. Upon La substitution, Eu_5‐xLa_xSn₂As₆results in a newn‐type Zintl phase across the temperature range of 300–800 K. 

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2. Exploring the Threshold between Fullerenes and Nanotubes: Characterizing Isomerically Pure, Empty-Caged, and Tubular Fullerenes D _5h -C ₉₀ and D _5d -C ₁₀₀

   https://doi.org/10.1021/jacs.2c02442  

   Schüßlbauer, Christoph M.; Krug, Marcel; Ullrich, Tobias; Franklin, Hannah M.; Stevenson, Steven; Clark, Timothy; Guldi, Dirk M. (June 2022, Journal of the American Chemical Society)
3. Synthesis and Characterization of Sr ₂ Co _{2- x} Fe _x O _5+d Perovskite Oxides

   https://doi.org/10.1017/S1431927621002919  

   Ede, Sivasankara Rao; Poasada, Carlos; Guffie, Jessa; Ratcliff, William; Wu, Hui; Han, Shubo; Luo, Zhiping (August 2021, Microscopy and Microanalysis)
4. 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)

   null (Ed.)

   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. 

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5. Thermal conductivity of (Ge ₂ Sb ₂ Te ₅ ) _1−x C _x phase change films

   https://doi.org/10.1063/5.0023476  

   Scott, Ethan A.; Ziade, Elbara; Saltonstall, Christopher B.; McDonald, Anthony E.; Rodriguez, Mark A.; Hopkins, Patrick E.; Beechem, Thomas E.; Adams, David P. (October 2020, Journal of Applied Physics)