Synthesis and ionic conductivities of M (Mg, Ba, Zr) and Al co-doped apatite-type lanthanum germanate electrolytes for IT-SOFC
| Autor: | Yao Wang, Hua Zhang, Haijun Hou, Pengde Han, Yuyan Cai, Qingle Shi, Tianjing Li |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Inorganic chemistry Doping Analytical chemistry chemistry.chemical_element Ionic bonding Sintering 02 engineering and technology Electrolyte Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry Lanthanum Relative density Germanate Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 29:2725-2732 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-017-8199-1 |
| Popis: | In this paper, the structure and ionic conductivities have been investigated for M (Mg, Ba, Zr) and Al co-doped apatite-type lanthanum germanates. La9.0.5Ge5.5Al0.5O26±δ (M = Mg, Ba and Zr) were prepared by solid state reaction. The results of XRD analysis showed that the space group is P63/m. M (Mg, Ba, Zr) substituting La site and Al substituting Ge site increased the cell volume and improved the lattice distortion of the apatite structure. In addition, M (Mg, Ba, Zr) and Al doping facilitated sintering and improved the relative density. Analysis of AC impedance spectroscopy showed that M (Mg, Ba, Zr) and Al co-doping in lanthanum germanates introduced local distortion and improved the ionic conductivities. Moreover, the thermal expansion coefficient (TEC) of La9.5M0.5Ge5.5Al0.5O26±δ (M = Mg, Ba and Zr) was improved after doping with M (Mg, Ba, Zr) and Al ions. La9.5Mg0.5Ge5.5Al0.5O26.5 sintered at 1400 °C exhibited the highest conductivity (1.26 × 10−2 S/cm, 800 °C) and improving TEC, which suggests that the (M (Mg, Ba, Zr), Al) doped apatite-type lanthanum germanate can be a potential material for the IT-SOFC electrolyte. |
| Databáze: | OpenAIRE |
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