MSCE  Vol.5 No.1 , January 2017
Thermoelectric Properties of Silver Antimonate with Mixed Valency of Antimony
Abstract: Silver (Ag) and silver antimonate (AgSbO3) composites with different amounts of Sb3+ were synthesized by normal sintering with the aim of realizing a thermoelectric material. The electrical conductivity (σ) increased in the sample containing larger amount of Sb3+, whereas Seebeck coefficient (S) decreased. Producing Sb3+ caused the generation of oxygen vacancies in the material, and thus the corresponding donor levels are created in the bandgap, providing more conduction electrons. The conductive Ag particles would contribute to the conduction path as bypasses for carrier transport. The thermal conductivity (κ) was slightly lower in the presence of Ag defects in AgSbO3.
Cite this paper: Ozawa, K. , Kakemoto, H. and Irie, H. (2017) Thermoelectric Properties of Silver Antimonate with Mixed Valency of Antimony. Journal of Materials Science and Chemical Engineering, 5, 121-128. doi: 10.4236/msce.2017.51016.

[1]   Terasaki, I., Sasago, Y. and Uchinokura, K. (1997) Large Thermoelectric Power in NaCo2O4 Single Crystals. Physical Review B, 56, R12685-R12687.

[2]   Ohtaki, M., Tsubota, T., Eguchi, K. and Arai, H. (1996) High-Temperature Thermoelectric Properties of (Zn1-xAlx)O. Journal of Applied Physics, 79, 1816.

[3]   Li, S., Funahashi, R., Matsubara, I., Ueno, K., Sodeoka, S. and Yamada, H. (2000) Synthesis and Thermoelectric Properties of the New Oxide Materials Ca3-xBixCo4O9+δ (0.0 < x < 0.75). Chemistry of Materials, 12, 2424-2427.

[4]   Ohta, H., Kim, S., Mune, Y., Mizoguchi, T., Nomura, K., Ohta, S., Nomura, T., Nakanishi, Y., Ikuhara, Y., Hirano, M., Hosono, H. and Koumoto, K. (2007) Giant Thermoelectric Seebeck Coefficient of a Two-Dimensional Electron Gas in SrTiO3. Nature Materials, 6, 129-134.

[5]   Nishiyama, S., Ichikawa, A. and Hattori, T. (2004) Theromoelectric Properties of CuO-Added AgSbO3 Ceramics. Journal of the Ceramic Society of Japan, 112, 298-300.

[6]   Allen, J.P., Nilsson, M.K., Scanlon, D.O. and Watson, G.W. (2011) Comparison of the Defective Pyrochlore and Ilmenite Polymorphs of AgSbO3 Using GGA and Hybrid DFT. Physical Review B, 83, Article ID: 035207.

[7]   Sang, H.-Y. and Li, J.-F. (2010) Thermoelectric Properties of AgSbO3 with Defect Pyrochlore Structure. Journal of Alloys and Compounds, 493, 678-682.

[8]   Li, F. and Li, J.-F. (2011) Microstructure and Thermoelectric Properties of AgSbO3 Ceramics Prepared by Ion-Exchange Powder Synthesis and Normal Sintering. Journal of Electronic Materials, 40, 1035-1041.

[9]   Wiggers, H., Simon, U. and Schon, G. (1998) Conductivity Studies on AgSbO3 Channel Structure by Impedance Spectroscopy. Solid State Ionics, 107, 111-116.

[10]   Kobayashi, R., Tanigawa, S., Takashima, T., Ohtani, B. and Irie, H. (2014) Silver-Inserted Heterojunction Photocatalysts for Z-Scheme Overall Pure-Water Splitting under Visible-Light Irradiation. The Journal of Physical Chemistry C, 118, 22450-22456.

[11]   Kawano, T., Kakemoto, H. and Irie, H. (2015) Niobium(V) Oxide with Added Silver as a Thermoelectric Material Prepared by Spark Plasma Sintering. Materials Letters, 156, 94-97.

[12]   Melin, E.P., Diaz, O.G., Rodrigues, J.M.D., Colon, G. and Navio, G.C. (2012) Effect of Deposition of Silver on Structural Characteristics and Photoactivity of TiO2-Based Photocatalysts. Applied Catalysis B: Environmental,127, 112-120.

[13]   Zhang, H., Sun, K., Feng, Z., Ying, P. and Li, C. (2006) Studies on the SbOx Species of SbOx/SiO2 Catalysts for Methane-Selective Oxidation to Formaldehyde. Applied Catalysis A: General, 305, 110-119.