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Authors = Ryan E. Baumbach

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14 pages, 9188 KiB  
Article
Effect of Ni Doping on the Thermoelectric Properties of YbCo2Zn20
by Jorge R. Galeano-Cabral, Benny Schundelmier, Olatunde Oladehin, Keke Feng, Juan C. Ordonez, Ryan E. Baumbach and Kaya Wei
Materials 2024, 17(8), 1906; https://doi.org/10.3390/ma17081906 - 19 Apr 2024
Cited by 1 | Viewed by 1351
Abstract
Thermoelectric devices are both solid-state heat pumps and energy generators. Having a reversible process without moving parts is of high importance for applications in remote locations or under extreme conditions. Yet, most thermoelectric devices have a rather limited energy conversion efficiency due to [...] Read more.
Thermoelectric devices are both solid-state heat pumps and energy generators. Having a reversible process without moving parts is of high importance for applications in remote locations or under extreme conditions. Yet, most thermoelectric devices have a rather limited energy conversion efficiency due to the natural competition between high electrical conductivity and low thermal conductivity, both being essential conditions for achieving a high energy conversion efficiency. Heavy-fermion compounds YbT2Zn20 (T = Co, Rh, Ir) have been reported to be potential candidate materials for thermoelectric applications at low temperatures. Motivated by this result, we applied chemical substitution studies on the transition metal site in order to optimize the charge carrier concentration as well as promote more efficient phonon scatterings. Here, we present the latest investigation on the Ni-doped specimens YbCo2−xNixZn20, where enhanced thermoelectric figure of merit values have been obtained. Full article
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8 pages, 1603 KiB  
Article
Single Crystal Growth of URu2Si2 by the Modified Bridgman Technique
by Andrew Gallagher, William L. Nelson, Kuan Wen Chen, Tiglet Besara, Theo Siegrist and Ryan E. Baumbach
Crystals 2016, 6(10), 128; https://doi.org/10.3390/cryst6100128 - 2 Oct 2016
Cited by 5 | Viewed by 8226
Abstract
We describe a modified Bridgman growth technique to produce single crystals of the strongly correlated electron material URu2Si2 and its nonmagnetic analogue ThRu2Si2. Bulk thermodynamic and electrical transport measurements show that the properties of crystals produced [...] Read more.
We describe a modified Bridgman growth technique to produce single crystals of the strongly correlated electron material URu2Si2 and its nonmagnetic analogue ThRu2Si2. Bulk thermodynamic and electrical transport measurements show that the properties of crystals produced in this way are comparable to those previously synthesized using the Czochralski or conventional molten metal flux growth techniques. For the specimens reported here, we find residual resistivity ratios R R R = ρ 300 K / ρ 0 as large as 116 and 187 for URu2Si2 and ThRu2Si2, respectively. Full article
(This article belongs to the Special Issue Correlated Electron Crystals)
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8 pages, 6979 KiB  
Article
Structure and Magnetic Properties of Ce3(Ni/Al/Ga)11—A New Phase with the La3Al11 Structure Type
by Oliver Janka, Tian Shang, Ryan E. Baumbach, Eric D. Bauer, Joe D. Thompson and Susan M. Kauzlarich
Crystals 2015, 5(1), 1-8; https://doi.org/10.3390/cryst5010001 - 29 Dec 2014
Cited by 2 | Viewed by 7060
Abstract
Single crystals of Ce3(Ni/Al/Ga)11 were obtained from an Al flux reaction. Single crystals of the title compound crystallizing in the orthorhombic space group Immm (No. 71, Z = 2) with a = 436.38(14), b = 1004.5(3) and c = 1293.4(4) [...] Read more.
Single crystals of Ce3(Ni/Al/Ga)11 were obtained from an Al flux reaction. Single crystals of the title compound crystallizing in the orthorhombic space group Immm (No. 71, Z = 2) with a = 436.38(14), b = 1004.5(3) and c = 1293.4(4) pm. This is a standardized unit cell of the previously published La3Al11 structure type. Wavelength dispersive microprobe provides the composition of Ce3.11(1)Ni0.03(1)Al8.95(1)Ga1.90(1). Single crystal refinement provides the composition Ce3Ni0.08Al9.13Ga1.78 with substitution of the Ni and Ga on the Al1 and Al4 sites with the Al2 and Al3 solely occupied by Al. Magnetic susceptibility measurements reveal antiferromagnetic ordering with TN = 4.8 K and there is no evidence for a ferromagnetic ordering that has been reported for Ce3Al11. The effective magnetic moment was found to be μeff = 1.9μB/Ce, which is lower than the expected value for trivalent Ce (2.54μB/Ce). Full article
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