n-p Type variation in thermoelectric AlMgB14–based materials by raw material mixture ratio

Fujima, Takuya; Arimatsu, Hideki; Miura, Shota; Yokoyama, S.; Takagi, Kenzo

doi:10.1016/j.solidstatesciences.2015.03.015

Cited by 3 publications

(4 citation statements)

References 24 publications

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“…In comparison with our previous work [ 27 ], we kept samples 2.5 times longer at the sintering temperature and carried out further annealing process to make samples more of equilibrium in the preparation process. The n-p type transition occurred around an NVE in the metallic sites of ca.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, it has been reported that the Seebeck coefficient of AlMgB 14 is 300–400 μV/K, a high positive value compared to multiple thermoelectric conversion materials [ 9 , 25 ]. In recent years, we developed an AlMgB 14 -based thermoelectric material exhibiting n-type characteristics by nonstoichiometric composition [ 26 , 27 ]. However, we have not clarified the detailed reason for our n-type AlMgB 14 -based materials.…”

Section: Introductionmentioning

confidence: 99%

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p-n Control of AlMgB14-Based Thermoelectric Materials by Metal Site Occupancy

2019

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The mechanism for the p-n control of AlMgB14-based thermoelectric material was investigated using Rietveld refinement and the first principle calculation. The p- and n-type AlMgB14-based thermoelectric materials were prepared by spark plasma sintering (SPS) with changing raw powder mixture ratio. Temperature dependence of Seebeck coefficient and electrical conductivity were different between the two types of samples. Seebeck coefficient shifted from positive to negative with increasing the number of valence electrons in the metal sites calculated by the metal site occupancy. The density of states and electron density distribution indicated that the electrons transfer from metal atoms to the B atoms.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

p-n Control of AlMgB14-Based Thermoelectric Materials by Metal Site Occupancy

2019

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“…[61] Joule heating provides higher densification, yielding densities comparable with the theoretical density of the compound. SPS has also been used for direct synthesis of borides (reactive SPS) such as 𝛽-boron [62] or AlMgB 14 [63,64] and densification of powders before transport properties measurements. [65]…”

Section: Fast Heating and Sintering Methodsmentioning

confidence: 99%

“…[139,140] Density of states (DOS) calculations also reveal that increasing the number of electrons exchanged between the metal and boron atoms enhances electrical properties. [63] On the other hand, MgAl 2 O 4 and BO 2 can form during the synthesis of undoped AlMgB 14 . [64] Since impurities influence electrical properties, powder mixture ratios of starting materials need to be controlled.…”

Section: Dodecaboridesmentioning

confidence: 99%

Thermoelectric Borides: Review and Future Perspectives

Saglik

Mete

Terzi

et al. 2023

Advanced Physics Research

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The conversion of waste heat into electricity plays a vital role in energy harvesting since conventional non‐renewable energy sources have been rapidly approaching the limit of utilization. The thermoelectric (TE) technology relies on converting temperature difference (or waste heat) into electricity or vice versa. The performance of TE materials is gauged by zT = S2T/ρκ, where S, ρ, κ, and T represent the Seebeck coefficient, the electrical resistivity, the total thermal conductivity, and the absolute temperature, respectively. Boron‐based compounds are considered refractory materials due to their high melting points and advanced chemical and mechanical stability. Besides high thermal stability, many borides exhibit intrinsically low thermal conductivity. The discovery of good TE efficiency in boron carbides, where unexpectedly high Seebeck coefficients (S(T) ≈ 250 µVK−1) are observed at high charge carrier densities (≈1021 cm−3), has induced an intense curiosity for the TE properties of other boron‐based compounds. Intermetallic borides with high boron content (>65 at%) are of particular interest among all known TE materials due to their great potential in TE generators, which can operate under extreme environmental conditions (T > 1000 K). This article reviews the TE properties of borides and state‐of‐art TE materials upon boron/borides doping.

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Rare earth higher borides

Mori

2020

Including Actinides

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n-p Type variation in thermoelectric AlMgB14–based materials by raw material mixture ratio

Cited by 3 publications

References 24 publications

p-n Control of AlMgB14-Based Thermoelectric Materials by Metal Site Occupancy

p-n Control of AlMgB14-Based Thermoelectric Materials by Metal Site Occupancy

Thermoelectric Borides: Review and Future Perspectives

Rare earth higher borides

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