- 【Updated on May 12, 2025】 Integration of CiNii Dissertations and CiNii Books into CiNii Research
- Trial version of CiNii Research Automatic Translation feature is available on CiNii Labs
- Suspension and deletion of data provided by Nikkei BP
- Regarding the recording of “Research Data” and “Evidence Data”
New Synthesis Route for Complex Borides; Rapid Synthesis of Thermoelectric Yttrium Aluminoboride via Liquid-Phase Assisted Reactive Spark Plasma Sintering
Description
<jats:title>Abstract</jats:title><jats:p>Y<jats:sub>x</jats:sub>Al<jats:sub>y</jats:sub>B<jats:sub>14</jats:sub> ceramics are of high interest as high temperature thermoelectric materials with excellent p, n control. In this study, direct synthesis of dense polycrystalline Y<jats:sub>x</jats:sub>Al<jats:sub>y</jats:sub>B<jats:sub>14</jats:sub> (x ~0.64, 0.52 ≤ y ≤ 0.67) ceramics was successfully carried out by spark plasma sintering using commercially available precursors. YB<jats:sub>4</jats:sub>, AlB<jats:sub>2</jats:sub> and B powders were reactively sintered with an additive AlF<jats:sub>3</jats:sub> at 1773 K for 5–60 min in reduced Ar atmosphere. The sinterability was remarkably enhanced by liquid phase sintering comparing to conventional synthesis techniques. Phase composition analysis by X-ray diffraction showed that main peaks belong to Y<jats:sub>x</jats:sub>Al<jats:sub>y</jats:sub>B<jats:sub>14</jats:sub> with the MgAlB<jats:sub>14</jats:sub> structure type and no peaks of AlF<jats:sub>3</jats:sub> were detected. The thermoelectric behavior was changed from p-type to n-type with increasing Al occupancy. Power factor and <jats:italic>ZT</jats:italic> values measured in this study were found to be in the same range as the best values previously reported. This original synthesis process is found to be less precursor-consuming as compared to previous synthesis processes, and strikingly, less time-consuming, as the synthesis time, is shortened from 8 h to 5 min for p-type and to 1 h for n-type. The total process time is shortened from ≥3 days to ~4–5 h. This discovery opens the door for more accessible synthesis of complex borides.</jats:p>
Journal
-
- Scientific Reports
-
Scientific Reports 10 (1), 2020-06-02
Springer Science and Business Media LLC
