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

Year 2017, Volume: 19 Issue: 3, 58 - 63, 07.12.2017

Selgin Al

https://doi.org/10.25092/baunfbed.363763

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

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