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Properties of ZnO Nanopowders Synthesized by Glycine-Nitrate Gel Combustion

100%

Yıldız Ö., Soydan A., Ipçizade E., Akın D., Uçak Ö.

Acta Physica Polonica A

2014

vol. 125

issue 2

664-666

The morphology and other physical properties of ZnO nanopowders synthesized by glycine-nitrate gel combustion process were investigated and characterized by scanning electron microscopy, transmission electron microscopy, nanosizer and X-ray diffraction. Glycine, NH_2CH_2COOH, and zinc nitrate Zn(NO_3)_2·6H_2O were dissolved in distilled water and the solution was coagulated by mixing at 90°C. The viscous gel prepared during glycine-nitrate mixing was heated at ≈220C to initiate the exothermic reactions by self-combustion where the temperature reached up to 1200°C. The glycine-nitrate ratio had a significant effect on the reaction temperature and final particle morphology. Therefore the synthesized powders have a different morphology like formless and spherical tufa ash. The particle size distribution was 50-1200 nm as measured using a nanosizer.

Structural Analysis of Ce Doped La_{1-x}Sr_xCo_{1-y}Fe_yO_{3-δ} Nanopowders Synthesized by Glycine-Nitrate Gel Combustion

86%

Yildiz Ö., Soydan A., Ata A., İpçızade E., Akin D., Uçak Ö.

Acta Physica Polonica A

2014

vol. 125

issue 2

669-672

Ce doped La_{1-x}Sr_xCo_{1-y}Fe_yO_3 (LCSCF) is a widely used cathode material due to its high catalytic activity for oxygen reduction and high oxygen exchange coefficient. LCSCF is also known with its high ionic and electronic conductivities and low electrode polarization losses which are highly critical properties for low temperature solid oxide fuel cell applications. In this study, structural properties of the LCSCF cathode nanopowder materials synthesized by glycine-nitrate gel combustion have been investigated by X-ray diffraction, differential scanning calorimetry, scanning electron microscopy, and nanosizer. Synthesized nanopowders represent volcanic ash like structures and morphologies. Ce, Sr, Co, and Fe are found to have significant effects on the structural properties of powders in terms of powders morphology, agglomerate structure, crystallite size and also lattice parameter of perovskite crystal. All synthesized ash powders have particle sizes around 50-600 nm, varying crystalline structures of perovskite and fluorite depending on molar ratio of Ce in the composition. Increasing molar Ce ratio over 0.4 is found to lead to the formation of a separate nano ceria phase in fluorite crystal structure on the surface of the synthesized powder.

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2 Acta Physica Polonica A

2 2014

2 Soydan A.

2 Uçak Ö.

1 Akin D.

1 Akın D.

1 Ata A.

1 Ipçizade E.

1 Yildiz Ö.

1 Yıldız Ö.

1 İpçızade E.

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Properties of ZnO Nanopowders Synthesized by Glycine-Nitrate Gel Combustion

Structural Analysis of Ce Doped La_{1-x}Sr_xCo_{1-y}Fe_yO_{3-δ} Nanopowders Synthesized by Glycine-Nitrate Gel Combustion