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Title: Effect of Oxygen Concentration and Tantalum Addition on the Formation of High Temperature Bismuth Oxide Phase by Mechanochemical Reaction
Authors: Hsiu-Na Lin
May-Show Chen
Yu-Hsueh Chang
Pee-Yew Lee
Chung-Kwei Lin
Contributors: 國立臺灣海洋大學:材料工程研究所
Keywords: bismuth oxide
phase transformation
high temperature metastable phase
mechanical milling
mechanochemical reaction
Date: 2019-06
Issue Date: 2019-06-21T06:12:50Z
Publisher: Materials
Abstract: Abstract: High-temperature face-centered cubic bismuth oxide phase is a material of great interest
given its unique properties. In the present study, α-Bi2O3 and tantalum powders were used as the
starting powders for the formation of high-temperature bismuth oxide phase via mechanochemical
synthesis by high energy ball milling. (Bi2O3)80(Ta)20 and (Bi2O3)95(Ta)5 in weight concentrations
were milled in either an oxygen-free argon-filled glove box environment or an ambient atmosphere to
investigate the effects of oxygen concentration and tantalum addition. The as-milled powders were
examined using X-ray diffraction, scanning electron microscopy with energy-dispersive spectroscopy,
and differential scanning calorimetry to reveal the structural evolution. The experimental results
showed that for (Bi2O3)95(Ta)5 powder mixtures milled within the glove box, tantalum gradually
reacted with the α-Bi2O3 phase and formed a β-Bi7.8Ta0.2O12.2 phase. For (Bi2O3)80(Ta)20 milled under
the same conditions, Ta and α-Bi2O3 mechanochemically reacted to form δ-Bi3TaO7 and bismuth after
10 min of high energy ball milling, whereas milling (Bi2O3)80(Ta)20 under the ambient atmosphere
with a much higher oxygen concentration accelerated the mechanochemical reaction to less than five
minutes of milling and resulted in the formation of high-temperature δ-Bi3TaO7 phase.
Relation: 12(12)
Appears in Collections:[Institute of Materials Engineering] Periodical Articles

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