Publications
Kazuki Imasato, Stephen Dongmin Kang, and G. Jeffrey Snyder, Energy & Environmental Science,12(3): 965–971, 2019.
Mg3Sb0.6Bi1.4, with a thermoelectric figure-of-merit zT > 1.0 around 400 K, finally surpasses n-type Bi2Te3. This zT is achieved at the alloy composition of Mg3Sb2-Mg3Bi2 where transport properties indicate that two types of conduction bands are converged, which gives the material high (weighted) mobility due to multiple low effective-mass bands. For
Kazuki Imasato, Stephen Dongmin Kang, and G. Jeffrey Snyder, Energy & Environmental Science,12(3): 965–971, 2019.
Mg3Sb0.6Bi1.4, with a thermoelectric figure-of-merit zT > 1.0 around 400 K, finally surpasses n-type Bi2Te3. This zT is achieved at the alloy composition of Mg3Sb2-Mg3Bi2 where transport properties indicate that two types of conduction bands are converged, which gives the material high (weighted) mobility due to multiple low effective-mass bands. For
Kazuki Imasato, Chenguang Fu, Yu Pan, Max Wood, Jimmy Jiahong Kuo, Claudia Felser, and G. Jeffrey Snyder, Advanced Materials, 1908218, 2020.
The first thermoelectric properties of n-type Te-doped Mg3Sb2 single crystals, synthesized by a combination of Sb-flux method and Mg-vapor annealing, is reported. The electrical conductivity and carrier mobility of single crystals exhibit a metallic behavior with a typical carrier and phonon transport mechanisms T^−1.5 dependence, indicating that phonon scattering dominates the charge
have also been carried out in parallel to understand the underlying reasons behind carrier transport.
Kazuki Imasato, Max Wood, Jimmy Jiahong Kuo, and G. Jeffrey Snyder. Journal of Materials Chemistry A, 6(41): 19941–19946, 2018.
n-Type conduction in a Mg3Sb1.5Bi0.5 system is achieved with La-doping at cation sites with a peak zT > 1. La-doped samples exhibit much higher doping efficiency and dopability compared to other chalcogen-doped samples. La-doping also significantly improves the thermal stability of n-type Mg3Sb1.5Bi0.5 measured via a long-term Hall carrier concentration measurement.
|
Kazuki Imasato, Saneyuki Ohno, Stephen Dongmin Kang, G. Jeffrey Snyder, APL Materials, 6, 016106, 2018. It is known that excess Mg is required to make n-type Mg3+xSb1.5Bi0.49Te0.01; however, too much excess Mg in the material increases the thermal conductivity and is therefore detri- mental for the overall thermoelectric performance of the material. A 20% reduction in effective lattice thermal conductivity at 600 K was observed by decreasing the nominal x from 0.2 to 0.01 in Mg3+xSb1.5Bi0.49Te0.01. |
Kazuki Imasato, Hiroki Tokutomi, and Ryo Ohmura. Crystal Growth and Design, 15:428–433, 2015.428–433, 2015.
Formation and growth of clathrate hydrate in a methane + decane + water three-phase quiescent system were visually observed and analyzed. The hydrate growth behavior in the system with liquid hydrocarbon is relevant to the conditions within an oil-producing pipeline.
Formation and growth of clathrate hydrate in a methane + decane + water three-phase quiescent system were visually observed and analyzed. The hydrate growth behavior in the system with liquid hydrocarbon is relevant to the conditions within an oil-producing pipeline.
