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Synthesis and characterisation of vanadium doped alkaline earth lanthanum germanate oxyapatite electrolyte

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Synthesis and characterisation of vanadium doped alkaline earth lanthanum germanate oxyapatite electrolyte
นักวิจัย : Li, Henan , Baikie, Tom , Pramana, Stevin S. , Shin, J. Felix , Slater, Peter R. , Brink, Frank , Hester, James , Wallwork, Kia , White, Timothy John
คำค้น : DRNTU::Engineering::Materials.
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Li, H., Baikie, T., Pramana, S. S., Shin, J. F., Slater, P. R., Brink, F., et al. (2012). Synthesis and characterisation of vanadium doped alkaline earth lanthanum germanate oxyapatite electrolyte. Journal of Materials Chemistry, 22(6), 2658-2669. , http://hdl.handle.net/10220/11576 , http://dx.doi.org/10.1039/c1jm13752b
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Journal of materials chemistry
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

The crystal chemistry and oxygen conductivity of vanadium-doped apatites of nominal composition [La8AE2][Ge6−xVx]O26+x/2 (AE = Ca, Sr, Ba; 0 ≤ x ≤ 1.5) were studied to establish their potential as intermediate temperature solid oxide fuel cell (SOFC) electrolytes. Single-phase products obtained for x ≤ 0.5 were found, using a combination of powder synchrotron X-ray and neutron diffraction, to be P63/m apatites. The ionic conductivities extracted by complex impedance spectroscopy showed that small vanadium amendments enhanced oxygen mobility at intermediate temperatures (500–700 °C) by more than one order of magnitude, as the incorporation of V5+ through displacement of Ge4+ is charge balanced with interstitial O2− that improves ionic conduction. The most promising composition was La7.88Ca2Ge5.35V0.65O26.15 that delivered σ = 3.44 × 10−4 S cm−1 at 500 °C. The superstoichiometric oxygen was delocalised, without fixed X-ray or neutron scattering centres. Crystal chemistry systematics demonstrate that the Ca-apatite was superior because the relatively small framework expanded the tunnel through reduced (La/AE)O6 metaprism twisting (φ), ensuring the P63/m symmetry was adopted, which favours the passage of O2− with lower activation energy.

บรรณานุกรม :
Li, Henan , Baikie, Tom , Pramana, Stevin S. , Shin, J. Felix , Slater, Peter R. , Brink, Frank , Hester, James , Wallwork, Kia , White, Timothy John . (2555). Synthesis and characterisation of vanadium doped alkaline earth lanthanum germanate oxyapatite electrolyte.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Li, Henan , Baikie, Tom , Pramana, Stevin S. , Shin, J. Felix , Slater, Peter R. , Brink, Frank , Hester, James , Wallwork, Kia , White, Timothy John . 2555. "Synthesis and characterisation of vanadium doped alkaline earth lanthanum germanate oxyapatite electrolyte".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Li, Henan , Baikie, Tom , Pramana, Stevin S. , Shin, J. Felix , Slater, Peter R. , Brink, Frank , Hester, James , Wallwork, Kia , White, Timothy John . "Synthesis and characterisation of vanadium doped alkaline earth lanthanum germanate oxyapatite electrolyte."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Li, Henan , Baikie, Tom , Pramana, Stevin S. , Shin, J. Felix , Slater, Peter R. , Brink, Frank , Hester, James , Wallwork, Kia , White, Timothy John . Synthesis and characterisation of vanadium doped alkaline earth lanthanum germanate oxyapatite electrolyte. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.