Perovskit tipi proton ileten bir malzemenin sentezi, karakterizasyonu ve iletkenlik ölçümü

Abstract

ABO₃ perovskite ailesinden olan seramik esaslı malzemeler, gaz ortamına bağlı olarak orta sıcaklıklarda (500-800°C) hem proton hem de oksijen iyonu iletkenliğini göstermektedir. Bu tür malzemeler çok yönlü taşıma özelliklerinden ve bunların orta sıcaklık katı oksit yakıt pillerinde elektrolit olarak kullanılma potansiyellerinden dolayı ilgi çekmiştir.  Bu çalışmada, katıhal reaksiyon yöntemi kullanılarak bir perovskit tip proton iletken malzeme sentezlenmiştir.  X-ışını difraksiyonu (XRD) ve X-ışını enerji dağılımı spektrometresi (EDXS) karakterizasyon teknikleri kullanılarak toz formundaki malzemenin kristalografik yapısı, faz saflığı ve element bileşimi belirlenmiştir.  Sonuçlar Uluslararası Kırınım Merkezi Verileri (ICDD) veri tabanı ile karşılaştırılmış olup, standart perovskite yapısı ile mükemmel uyum göstermiştir.  Yüzey alanı ölçümü Brunauer-Emmett-Teller (BET) yöntemi kullanılarak gerçekleştirildi.  İletkenlik ölçümü, farklı gaz ortamlarında AC empedansı kullanılarak orta sıcaklık aralığında gerçekleştirildi.

 

Keywords

• Perovskit malzemeler,AC empedansı,ortasıcaklık

Fabrication, characterisation and conductivity measurement of a perovskite-type proton conductor

Abstract

Ceramic based materials from the ABO₃ perovskite family, show both proton and oxide ion conductivity at intermediate temperatures depending on the gaseous environment. Due to these multi-species transport features of them and their potential to be utilised as an electrolyte in solid oxide fuel cells operating at intermediate temperature, there has been lot of research focused on them and their properties. In this study, a perovskite type proton conductor was synthesised by using solid state reaction method. X-ray diffraction (XRD) and Energy dispersive X-ray spectroscopy (EDXS) characterisation techniques were utilised to determine crystal structure, phase purity and the elemental materials composition in powder form. The results were compared with International Centre for Diffraction Data (ICDD) database and displayed excellent match with standard perovskite structure. Also, the surface area measurement was performed via utilising the Brunauer-Emmett-Teller (BET) method. The conductivity measurement was carried out at the intermediate temperature (500-800°C) using AC impedance at different atmospheres.

Keywords

• Perovskite materials,AC impedance

References

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