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| 基本情報 |
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| 氏名 |
牧 涼介 |
| 氏名（カナ） |
ﾏｷ ﾘｮｳｽｹ |
| 氏名（英語） |
Maki Ryosuke |
| 所属 |
工学部 応用化学科 |
| 職名 |
講師 |
| researchmap研究者コード |
R000007789 |
| researchmap機関 |
岡山理科大学 |
Thermoelectric properties of oxygen-deficient spinel-type ZnxFe3−xO4−δ prepared by carbothermal reduction and spark plasma sintering
R. Maki, K. Yokoyama, S. Maruyama, Y. Kusano
This paper describes the effect of oxygen vacancies, which are induced by a carbothermal reduction process and spark plasma sintering (SPS) treatment, on the thermoelectric properties of spinel-structured zinc ferrites Zn x Fe 3 − x O 4 (0.2 ≤ x ≤ 1.0). Characterization of the oxygen-deficient Zn x Fe 3 − x O 4 − ? materials revealed that Zn 2 +preferentially occupy the octahedral B -sites and that valence modification of Fe 3 + to Fe 2 + occurred, resulting in an excess of n-type carriers at B -sites and an increased power factor. In addition, Co substitution enhanced the power factor for the materials over the entire investigated temperature range. Compared with the carbothermal reduction process, SPS treatment effectively introduced oxygen vacancies within a short time and resulted in a material with a substantially improved electrical conductivity.
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