Microstructure, Crystal Lattice, Electrical and Magnetic Properties of Bi2O3 Ceramics Doped with Some Rare Earth Oxides Depending on Doping Ratios

Year 2025, Volume: 8 Issue: 2, 196 - 206, 23.12.2025

Enis Sert , Mehtap Payveren Arıkan , Ali Yiğit , Mehmet Ari , Buket Saatçi

https://doi.org/10.54565/jphcfum.1699132

Abstract

In this study, Bi2O3-based ceramic powders doped with different amounts of some rare earth oxides (Dy2O3, Sm2O3, Ho2O3 and CeO2) were synthesized using solid-state reactions under atmospheric conditions. 5Dy5Sm10Ho5Ce (A1 - 5% Dy: 5% Sm: 5% Ho:5 % Ce, 1:1:1:1) sample has both δ-Bi2O3 and cubic CeO2 phases. However, δ -Bi2O3 cubic phase peaks predominate. The δ-Bi2O3 cubic phase has a unit cell parameter of 5.525 Å and the CeO2 cubic phase has a unit cell parameter of 5.411 Å. The conductivity measurements showed that among the samples of which cubic δ phase is stabilized at 900 °C, the A1 sample has the highest electrical conductivity with 4.05x10-1 S/cm. The XRD measurement for 5Dy5Sm15Ho5Ce (A2-5% Dy: 5% Sm: 10% Ho: 5% Ce, 1:1:2:1) showed that, the (hkl) parameters obtained from the XRD peaks of Bi2O3 shifted very little as the amount of Ho increased and it has left its place to the Bi1.5Ho0.5O3 cubic phase structure. The Bi1.5Ho0.5O3 cubic phase has a unit cell parameter of 5.497 Å. In addition, the increase in the contribution rate resulted in the maintenance of this phase. The miller indices of the most intense peaks for both Bi1.5Ho0.5O3 and Bi2O3 were determined as (111), (200), (220) and (311). Additionally, according to FE–SEM pictures acquired at 5 μm and 2 μm distances, grain size is not uniform throughout the surface, and the grain boundary line varies sharply as dopant concentration increases. According to SEM images, grain sizes are not uniform across the surface and decreased as the additive concentration increased. Magnetization measurements revealed a paramagnetism at room temperature and very low temperatures.

Keywords

Bi2O3 , Fuel Cell , Morphology , Electrical Properties , Paramagnetism

References

• [1] Çetinkaya, M., Karaosmanoglu F., 2005. Yakit pilleri, Makine Mühendisleri Odası Tesisat Mühendisliği Dergisi., 75, 7–19.
• [2] Yegen, M.S., Yegen,G., Erkan, E., Kepoglu,G., 2008. Hidrojen ve yakıt pilleri projelerine bir bakış içinde: Ulus. temiz Enerj. sempozyumu, İTÜ, İstanbul, ss. 591–598.
• [3] Yılmaz, A., Ünvar, S., Ekmen, M., Aydın, S., 2017. YAKIT PİLİ TEKNOLOJİSİ, Technol. Appl. Sci. 12, 185–192.
• [4] Durmuş, S., 2012. Eu2O3, Gd2O3, Ho2O3, Dy2O3 Katkılı Bi2O3 Tabanlı Katı Elektrolit Sistemlerinin Sentezlenmesi ve Karakterizasyonu, Erciyes University.
• [5] Jung, D.W., 2009. Conductivity and stability of bismuth oxide-based electrolytes and their applications for IT-SOFCs, University of Florida.
• [6]Arı, M., Balcı, M., Polat, Y., 2018. Synthesis and characterization of (Bi2O3)1−x−y−z (Gd2O3)x (Sm2O3)y (Eu2O3)z quaternary solid solutions for solid oxide fuel cell, Chinese J. Phys. 56, 2958–2966.
• [7]Polat, Y., Arı M., Dağdemir,Y., 2018. Magnetic Properties of Co-doped Bismuth Oxide (δ-Bi2O3) at Low Temperature, J. Low Temp. Phys., 193, 74–84.
• [8] Kayalı, R., Özen, M.K., Bezir, N.Ç., Evcin, A., Effect of concentration of Sm2O3 and Yb2O3 and synthesizing temperature on electrical and crystal structure of (Bi2O3)1−x−y(Sm2O3)x(Yb2O3)y electrolytes fabricated for IT- SOFCs, Phys. B Condens. Matter. 489, 39–44.
• [9] Kobayashi, K., Tsunoda, T., 2004. Oxygen permeation and electrical transport properties of 60 vol.% Bi1.6Y0.4O3 and 40 vol.% Ag composite prepared by the sol–gel method, Solid State Ionics. 175, 405–408.
• [10] Guo, W., Liu, J., 2010. A novel design of anode-supported solid oxide fuel cells with Y2O3-doped Bi2O3, LaGaO3 and La-doped CeO2 trilayer electrolyte, J. Power Sources. 195, 8185–8188.
• [11] Leszczynska, M., Holdynski, M., Krok, F., Abrahams, I., Liu, X., Wrobel, W., 2010. Structural and electrical properties of Bi3Nb1−xErxO7−x, Solid State Ionics. 181, 796–811.
• [12] Jung, D.W., Duncan, K.L., Wachsman, E.D., 2010. Effect of total dopant concentration and dopant ratio on conductivity of (DyO1.5)x–(WO3)y–(BiO1.5)1−x−y, Acta Mater., 58, 355–363.
• [13] Aytimur, A., Koçyiğit, S., Uslu, İ., Durmuşoğlu, Ş. Akdemir, A., 2013. Fabrication and characterization of bismuth oxide–holmia nanofibers and nanoceramics, Curr. Appl. Phys., 13, 581–586.
• [14] Aidhy, D.S., Nino, J.C., Sinnott, S.B., Wachsman, E.D., Phillpot, S.R., 2008. Vacancy-Ordered Structure of Cubic Bismuth Oxide from Simulation and Crystallographic Analysis, J. Am. Ceram. Soc., 91, 2349–2356.
• [15] Wang, S.-F., Hsu, Y.-F., Tsai, W.-C., Lu, H.-C., 2012. The phase stability and electrical conductivity of Bi2O3 ceramics stabilized by Co-dopants, J. Power Sources., 218, 106–112.
• [16] Chou, T., Liu, L.-D., Wei, W.-C.J., 2011. Phase stability and electric conductivity of Er2O3–Nb2O5 co-doped Bi2O3 electrolyte, J. Eur. Ceram. Soc., 31, 3087–3094.
• [17] Koçyiğit, S 2018. Boron and praseodymium doped bismuth oxide nanocomposites: Preparation and sintering effects, J. Alloys Compd. 740, 941–948.
• [18] Wachsman, E.D., Boyapati, S., Jiang, N. 2001. Effect of dopant polarizability on oxygen sublattice order in phase-stabilized cubic bismuth oxides, Ionics (Kiel). 7,1–6.
• [19] Koçyiǧit, S., Gökmen, Ö., Temel, S., Aytimur, A., Uslu, I., Haman Bayari, S., 2013. Structural investigation of boron undoped and doped indium stabilized bismuth oxide nanoceramic powders, Ceram. Int., 39, 7767–7772.
• [20] Enamullah, Venkateswara, Y., Gupta, S., Varma, M.R., Singh, P., Suresh, K.G., Alam, A., 2015. Electronic structure, magnetism, and antisite disorder in CoFeCrGe and CoMnCrAl quaternary Heusler alloys, Phys. Rev. B - Condens. Matter Mater. Phys., 92, 1–7.
• [21] Kalaycioglu, N.O., Çirçir, E., 2012. Synthesis, characterization and oxide ionic conductivity of binary β-(Bi2O 3) 1-x(Lu2O3)x system, J. Chinese Chem. Soc. 59, 28–31.
• [22] Kumar, A., Yadav, K.L., 2013. Enhanced magnetodielectric properties of single-phase Bi 0.95-xLa0.05LuxFeO3 multiferroic system, J. Alloys Compd., 554, 138–141.