This study investigates the thermoelectric properties of Ca2Fe2O5 over a temperature range of 7？C to 50？C. The experiment measured the voltage generated by temperature differences across two sides of the material, with a focus on the voltage response at temperatures both below and above room temperature. Results indicate that at lower temperatures (7？C to 15？C), the voltage generated by the temperature difference was higher, though not directly proportional to the magnitude of the temperature gradient. The highest voltage recorded for the smallest temperature difference in this range was 109 mV, observed between 14.6？C and 17.6？C (smallest temperature difference, 3？C). Similarly, at temperatures above room temperature, the voltage generated was relatively lower, peaking at 125 mV between 9？C and 44？C (higher temperature difference). These results suggest complex behavior of Ca2Fe2O5’s thermoelectric response, with non-linear relationships between voltage and temperature differences at both low and high temperatures.
References
[1]
Singh, R., Dogra, S., Dixit, S., Vatin, N.I., Bhardwaj, R., Sundramoorthy, A.K., et al. (2024) Advancements in Thermoelectric Materials for Efficient Waste Heat Recovery and Renewable Energy Generation. HybridAdvances, 5, Article ID: 100176. https://doi.org/10.1016/j.hybadv.2024.100176
[2]
Jouhara, H., Żabnieńska-Góra, A., Khordehgah, N., Doraghi, Q., Ahmad, L., Norman, L., et al. (2021) Thermoelectric Generator (TEG) Technologies and Applications. InternationalJournalofThermofluids, 9, Article ID: 100063. https://doi.org/10.1016/j.ijft.2021.100063
[3]
Zhang, X. and Zhao, L. (2015) Thermoelectric Materials: Energy Conversion between Heat and Electricity. JournalofMateriomics, 1, 92-105. https://doi.org/10.1016/j.jmat.2015.01.001
[4]
Hona, R.K., Dhaliwal, G.S. and Thapa, R. (2022) Investigation of Grain, Grain Boundary, and Interface Contributions on the Impedance of Ca2FeO5. Applied Sciences, 12, Article 2930. https://doi.org/10.3390/app12062930
[5]
Hona, R.K., Huq, A., Mulmi, S. and Ramezanipour, F. (2017) Transformation of Structure, Electrical Conductivity, and Magnetism in AA’Fe2O6−δ, A = Sr, Ca and A’ = Sr. InorganicChemistry, 56, 9716-9724. https://doi.org/10.1021/acs.inorgchem.7b01228
[6]
Asenath-Smith, E., Lokuhewa, I.N., Misture, S.T. and Edwards, D.D. (2010) P-Type Thermoelectric Properties of the Oxygen-Deficient Perovskite Ca2Fe2O5 in the Brownmillerite Structure. JournalofSolidStateChemistry, 183, 1670-1677. https://doi.org/10.1016/j.jssc.2010.05.016
[7]
Wang, H., Su, W., Liu, J. and Wang, C. (2016) Recent Development of N-Type Perovskite Thermoelectrics. JournalofMateriomics, 2, 225-236. https://doi.org/10.1016/j.jmat.2016.06.005
[8]
Shi, X., Wu, H., Liu, Q., Zhou, W., Lu, S., Shao, Z., et al. (2020) SrTiO3-Based Thermoelectrics: Progress and Challenges. NanoEnergy, 78, Article ID: 105195. https://doi.org/10.1016/j.nanoen.2020.105195
[9]
Jiamprasertboon, A., Okamoto, Y., Hiroi, Z. and Siritanon, T. (2014) Thermoelectric Properties of Sr and Mg Double-Substituted LaCoO3 at Room Temperature. Ceramics International, 40, 12729-12735. https://doi.org/10.1016/j.ceramint.2014.04.123
[10]
Terasaki, I., Sasago, Y. and Uchinokura, K. (1997) Large Thermoelectric Power in NaCo2O4 Single Crystals. PhysicalReviewB, 56, R12685-R12687. https://doi.org/10.1103/physrevb.56.r12685
[11]
Molinari, M., Tompsett, D.A., Parker, S.C., Azough, F. and Freer, R. (2014) Structural, Electronic and Thermoelectric Behaviour of CaMnO3 and CaMnO(3−δ). Journal of Materials Chemistry A, 2, 14109-14117. https://doi.org/10.1039/c4ta01514b
[12]
Kumar, P., Kashyap, S.C., Sharma, V.K. and Gupta, H.C. (2015) Improved Thermoelectric Property of Cation-Substituted CaMnO3. Chinese Physics B, 24, Article ID: 098101. https://doi.org/10.1088/1674-1056/24/9/098101
