In:
CrystEngComm, Royal Society of Chemistry (RSC), Vol. 24, No. 26 ( 2022), p. 4772-4786
Abstract:
SrTiO 3 has high thermoelectric properties and excellent high-temperature stability, which makes it a promising thermoelectric material for use in harsh environments. Hence, it has potential applications in power generation and sensors through direct conversion between heat and electricity. In this study, we investigated the crystal orientations on the crystal growth plane to seek the crystal orientation that is suitable for higher thermoelectric (TE) properties. The [510], [12 5 0] and [320] directions were selected which are on the (001) crystal plane and quarterly divide the angle between the [100] and [110] directions. Two common directions [100] and [110] were selected for comparison purposes. The SrTiO 3 single crystals are annealed in carbon powders at 1573 K and 1673 K to form SrTiO 3− δ . With the increase in annealing temperature, the electrical conductivity of SrTiO 3− δ in the [510], [12 5 0] and [320] directions decreases, which is attributed to the decreasing carrier concentrations. This agrees well with the results calculated using the first-principles calculation. After annealing at 1573 K, the SrTiO 3− δ single crystal exhibits the highest ZT value of 0.19 at 873 K in the [510] direction. However, the two common directions, [100] and [110], are not suitable for high thermoelectric properties. In particular, the SrTiO 3− δ single crystal in the [12 5 0] direction can always exhibit higher PF and ZT values, regardless of the variation of the annealing temperature in carbon powders. The results of this study are imperative for the design and development of perovskite TE materials.
Type of Medium:
Online Resource
ISSN:
1466-8033
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2025075-7
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