synthesis and study on ionic conductive (bi1−x,vx)o1.5−δ materials with a dual-phase microstructure

Synthese und Untersuchung ionenleitender (Bi1−x,Vx)O1.5−δ-Materialien mit zweiphasiger Mikrostruktur

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ID: 163378
2016
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Abstract
Homogeneous Bi2O3-V2O5 powder mixtures with different amounts of V2O5 content (≤15 mol%) were prepared by colloidal dispersion and sintering to high density. The sintered and annealed samples were studied by thermal analysis, quantitative X-ray diffraction and scanning electron microscopy. The electrical and ionic conductivities of the conductors were also measured by a four-probe direct current (DC) method. The results of the samples prepared at 600–800 °C and annealed for as long as 100 h show that the sintered samples consisting of a pure γ phase or δ + γ binary phase perform differently in conductivity. The highly conductive δ phase in the composition of Bi0.92V0.08O1.5−δ enhances the electric conductivity 10-times better than that of the pure γ-sample (Bi0.94V0.06O1.5−δ) between 400 and 600 °C. The compatible regions of the γ phase with the α- or δ phase are also reported and discussed, so a part of the previously published Bi2O3-V2O5 phase diagram below 800 °C is revised.
Homogene Bi2O3-V2O5-Pulvermischungen mit unterschiedlichen V2O5-Gehalten (≤ 15 Mol-%) wurden mittels kolloidaler Dispersion hergestellt und zu hoher Dichte gesintert. Die gesinterten und getemperten Proben wurden mittels thermischer Analyse, quantitativer Röntgenbeugung und Rasterelektronenmikroskopie untersucht. Die elektrische und ionische Leitfähigkeit der Leiter wurde zudem mittels einer Viersonden-Gleichstrommethode (DC) gemessen. Die Ergebnisse der bei 600–800 °C hergestellten und bis zu 100 h getemperten Proben zeigen, dass die gesinterten Proben, die aus einer reinen γ-Phase oder einer binären δ + γ-Phase bestehen, sich hinsichtlich ihrer Leitfähigkeit unterschiedlich verhalten. Die hochleitfähige δ-Phase in der Zusammensetzung Bi0.92V0.08O1.5−δ steigert die elektrische Leitfähigkeit zwischen 400 und 600 °C um das Zehnfache gegenüber der reinen γ-Probe (Bi0.94V0.06O1.5−δ). Darüber hinaus werden die Kompatibilitätsbereiche der γ-Phase mit der α- bzw. δ-Phase dargelegt und diskutiert, sodass ein Teil des zuvor veröffentlichten Bi2O3-V2O5-Phasendiagramms unterhalb von 800 °C revidiert wird.
Reference Key
lai2016materialssynthesis Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Yu-Wei Lai;Wen-Cheng J. Wei
Journal Nature Materials
Year 2016
DOI
10.3390/ma9110863
URL
http://www.mdpi.com/1996-1944/9/11/863
Keywords
solid oxide fuel cell (sofc) vanadium oxide electronics civil engineering (general)microscopydescriptive and experimental mechanics nuclear engineeringengineering (general)

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