Rapid synthesis of submicron crystalline barium zirconate BaZrO3 by precipitation in aqueous basic solution below 100 °C
✍ Scribed by Frédéric Boschini; André Rulmont; Rudi Cloots; Bénédicte Vertruyen
- Book ID
- 104023017
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 866 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0955-2219
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✦ Synopsis
Pure crystalline BaZrO 3 powders can be produced by precipitation in highly basic aqueous solution. The influence of several synthesis parameters is studied. At high OH -concentration ([NaOH] = 20 mol/l), it is possible to obtain the well-crystallized stoichiometric perovskite phase at relatively low temperature (∼80 • C), after a short reaction time (15 min) and without requiring any precaution to avoid the presence of CO 2 . This synthesis method yields spherical particles, whose size can be controlled by changing the concentration of the Ba + Zr solution. No calcination treatment is necessary since the precipitate is crystalline. Suitable choice of the synthesis parameters ([NaOH] = 20 mol/l, [Ba + Zr] = 1 mol/l, reaction time = 15 min) yields a sub-micron precipitate with excellent densification behaviour. Corrosion tests in BaO-CuO melt show that ∼98% dense BaZrO 3 obtained by sintering at 1650 • C for 13 h could be used for crucibles in the synthesis of YBa 2 Cu 3 O 7 superconducting single crystals.