Crystal structure of a second polymorph of germacrone, C[subscript 15]H[subscript 22]O
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Kaduk, James A.↗
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Results for “polymorphism”
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Chemical Design of IrS[subscript 2] Polymorphs to Understand the Charge/Discharge Asymmetry in Anion
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Marchandier, Thomas↗
Polymorphic Control of Solution-Processed Cu 2 SnS 3 Films with Thiol–Amine Ink Formulation
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
Inverse Design of Tetracene Polymorphs with Enhanced Singlet Fission Performance by Property-Based Genetic Algorithm Optimization
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
Polymorphism in Weberite Na 2 Fe 2 F 7 and its Effects on Electrochemical Properties as a Na-Ion Cathode
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25 ENERGY STORAGE↗
Polymer-Assisted Polymorph Transition in Melt-Processed Molecular Semiconductor Crystals
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36 MATERIALS SCIENCE↗
Polymorphs of Rb[subscript 3]ScF[subscript 6]: X-ray and Neutron Diffraction, Solid-State NMR, and D
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Rakhmatullin, Aydar↗
Structural Complexity and Tuned Thermoelectric Properties of a Polymorph of the Zintl Phase Ca 2 CdSb 2 with a Non-centrosymmetric Monoclinic Structure
The Zintl phase Ca 2 CdSb 2 was found to be dimorphic. Besides the orthorhombic Ca 2 CdSb 2 (-o), here we report on the synthesis, the structural characterization, and the thermoelectric transport properties of its monoclinic form, Ca 2 CdSb 2 (-m), and its Lu-doped variant Ca 2–x Lu x CdSb 2 (x ≈ 0.02). The monoclinic structure exhibits complex structural characteristics and constitutes a new structure type with the non-centrosymmetric space group Cm (Z = 30). The electrical resistivity ρ(T) measured on single crystals of both phases portrays a transition from a semiconductor to a degenerate p-type semiconductor upon doping with Lu and with an attendant change in the Hall carrier concentration nH from 7.15 × 10 18 to 2.30 × 10 19 cm –3 at 300 K. The Seebeck coefficient S(T) of both phases are comparable and indicate a hole-dominated carrier transport mechanism with magnitudes of 133 and 116 μV/K at 600 K for Ca 2 CdSb 2 (-m) and Ca 2–x Lu x CdSb 2 , respectively. The convoluted atomic bonding with an attendant large unit cell volume of ~4365 Å 3 drives a putative low thermal conductivity in these materials resulting in a power factor PF of 1.63 μW/cm K 2 and an estimated thermoelectric figure of merit zT of ~0.5 for Ca 2–x Lu x CdSb 2 at 600 K. Furthermore, differential scanning calorimetry results reveal the stability of these phases up to about 960 K, making them candidates for moderate temperature thermoelectric materials.
36 MATERIALS SCIENCE↗