Reaction mechanism of preparing Bi0.75Dy0.25O1.5 nanopowder by the reverse titration chemical coprecipitation method

YUAN Qiang; ZHEN Qiang; LI Rong; GAO Lin; NI Liang

doi:10.13374/j.issn1001-053x.2010.02.017

Volume 32 Issue 2

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YUAN Qiang, ZHEN Qiang, LI Rong, GAO Lin, NI Liang. Reaction mechanism of preparing Bi0.75Dy0.25O1.5 nanopowder by the reverse titration chemical coprecipitation method[J]. Chinese Journal of Engineering, 2010, 32(2): 245-249. doi: 10.13374/j.issn1001-053x.2010.02.017

Citation:

YUAN Qiang, ZHEN Qiang, LI Rong, GAO Lin, NI Liang. Reaction mechanism of preparing Bi_0.75Dy_0.25O_1.5 nanopowder by the reverse titration chemical coprecipitation method[J]. Chinese Journal of Engineering, 2010, 32(2): 245-249. doi: 10.13374/j.issn1001-053x.2010.02.017

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Reaction mechanism of preparing Bi_0.75Dy_0.25O_1.5 nanopowder by the reverse titration chemical coprecipitation method

doi: 10.13374/j.issn1001-053x.2010.02.017

YUAN Qiang¹,
ZHEN Qiang^1,2,
LI Rong^1,2,3,
GAO Lin¹,
NI Liang¹

1. Nano-science and Nano-technology Research Center, Shanghai University, Shanghai 200444, China;
2. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;
3. Laboratory of Solid State Chenistry and Catalysis, Lille Science and Technology University, Lille 59652, France

Received Date: 2009-06-01

Abstract

Abstract

Using analytically pure Bi₂O₃ and Dy₂O₃ as raw materials,the Bi_0.75Dy_0.25O_1.5 precursor was prepared by the reverse titration chemical coprecipitation method.By thermogravimetry-mass spectrum (TG-MS) analysis,the results show that the components of the precipitation are BiOOH and Dy(OH)₃ with little BiONO₃ and Bi₂O₂CO₃.After calcining the precursor at 500℃ for 3 h,β-Bi_0.75Dy_0.25O_1.5 could be obtained and its average grain size is 16.02 nm by the Scherrer formula from X-ray diffraction (XRD) analysis.X-ray fluorescence (XRF) analysis shows that the ratio of Bi/Dy extremely approaches to the theoretic stoichiometric ratio.Transmission electron microscope (TEM) analysis results show that the particles size is less than 20 nm in good dispersion.The mechanism of preparation reaction was studied by thermodynamic analysis.
- nanopowder,
- bismuth oxide,
- dysprosium oxide,
- reversing titration,
- chemical coprecipitation,
- reaction mechanism