Selin ENGÜRLÜ, ZEYNEP TAŞLIÇUKUR ÖZTÜRK, NİLGÜN KUŞKONMAZ

Investigation of the Production of Beta-Al2O3 Solid Electrolyte from Seydişehir α-Al2O3

In this study, we report the production of β˝-Al2O3 solid electrolyte by using Seydişehir α-Al2O3. Alumina has to be low grain-sized to ensure α-β phase transformation. Therefore, grain refining process was applied to high grain sized Seydişehir alumina by jetmill grinding. Seydişehir alumina was calcined at 1200 0C for 2 hours. After calcination, calcined Al2O3 and Na2CO3 were mixed during 2 hours in the mill. The samples were pressed and sintered to obtain β˝-Al2O3. β˝- Al2O3 was obtained after sintering at 1550°C for 1 hour. Due to the formation of β˝- Al2O3, it is observed that dielectric properties increased.

Seydişehir α-Al2O3’dan Beta-Al2O3 Katı Elektrolit Üretiminin Araştırılması

Bu çalışmada, Seydişehir α-Al2O3 kullanılarak β˝-Al2O3 üretimi yapılmıştır. α-β faz dönüşümünü sağlamak için alüminanın düşük tane boyutuna sahip olması gerekmektedir. Bu nedenle, iri taneli Seydişehir alüminaya jet mil öğütme yöntemi ile tane küçültme işlemi uygulanmıştır. Seydişehir alüminası 1200 0C’de 2 saat kalsine edilmiştir. Kalsinasyon işleminden sonra, kalsine Al2O3 ve Na2CO3 bilyalı değirmende 2 saat boyunca karıştırılmıştır. 1550°C’de 1 saat sinterlemeden sonra β˝-Al2O3 elde edilmiştir. β˝-Al2O3’nın oluşmasıyla birlikte dielektriksel özelliklerin arttığı gözlenmiştir.

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Shqau, K. 2003. Characterization of the electronic conduction parameter of cation conducting solid electrolytes. Bericth Nr.141 Max-Planck-Institut für Metallforschung. Stuttgart University, Stuttgart, Germany, 2003.

Chengfei, Z., Jinhua, X., Guanghui, J. 2015. Effect of Na2O content on properties of beta alumina solid electrolytes, Materials Science in Semiconductor Processing, 31 (2015), 487–492.

Subasri, R., Mathews, T., Sreedharan, O.M., Raghunatan, V.S.2003. Microwave processing of sodium beta alumina. Solid State Ionics, 158 (2003), 199-204.

Lu, X., Xia, G., Lemmon, J.P., Yang, Z.2010. Advanced materials for sodium-beta alumina batteries: Status, Challenges and Perspective. Journal of Power Sources, 195(2010), 2431- 2442.

Jones, I.W., Miles, L.J. Production of beta alumina ceramic. United States Patent 1975.

Jayaraman, V., Periaswami, G., Kutty, T.R.N. 2008. Gel- to- crysallite conversion technique for the syntheses of M-β/β˝-Alumina (M:Li,Na,K,Rb,Ca or Eu).Materials Research Bullettin, 43(2008), 2527-2537.

Dae-Han, L, Sung-Tae, L., Jin-Sik, K., Sung-Ki, L.2017.Analysis of properties of partially stabilized zirconia-doped Na+-beta-alumina prepared by calcining-cum-sintering process. Materials Research Bulletin, (2017)

May, G.J.1978. The development of Beta-alumina for use in electro-chemical cells: A Survey. Journal of Power Sources,3(1978), 1-22.

Sartori S, Martocci A, Muffato A, Guglielmi M.2004. Sol-Gel synthesis of Na Beta- Al2O3 powders. Journal of the European Ceramic Society, 24(2004), 911-914.

Dunn, S., Kumar, R.V., Fray, D.J.2000. Thermodynamic studies of the ionic conductor Ba β - Al2O3. Solid State Ionics, 128(2000), 141- 144.

Chengfei, Z, Jinhua, X., Guanghui, J. 2015. Effect of Na2O content on properties of beta alumina solid electrolytes. Materials Science in Semiconductor Processing, 31 (2015), 487- 492.

Roth, W.L., Devries, R.C. 1977. Comparison of the thermal stability of β and β˝-alumina high pressures. Journal of Solid State Chemistry, 20 (1977), 111-118.

Song, H.І., Kim, E.S., Yoon, K.H.1988. Phase transformation and characteristics of beta alumina. Physica B,150 (1988), 148-159.

Erten, R., Emrullahoğlu, C.B., Yazıcı, Z.O., Emrullahoğlu, Ö.F.2004. An investigation on injection molding of Seydişehir alumina. Key Engineering Materials, 264-268(2004), 2523- 2526.

Tambaş, T., Özgen, S. Seydişehir alüminasının slip döküm parametrelerinin belirlenmesi.2007. İTÜ Dergisi/Mühendislik, 6(2007), 83-94.

Subasri, R., Nafe, H.2003. An alternative approach to characterize the equilibrium in a biphasic α-Al2O3/Na-β-Alumina mixture as a function of sodium activity. Electrochimica Acta, 48(2003),3535-3540.