Effect of pH on crystallization of nanocrystalline zirconia in a microwave-hydrothermal process

Haibo Ouyang; Cuiyan Li; Kezhi Li; Hejun Li; Yulei Zhang

doi:10.1007/s11595-016-1332-9

Effect of pH on crystallization of nanocrystalline zirconia in a microwave-hydrothermal process

Haibo Ouyang, Cuiyan Li, Kezhi Li, Hejun Li, Yulei Zhang

School of Materials Sience and Engineering

Shaanxi University of Science & Engineering

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

Nanocrystalline zirconia (ZrO₂) was synthesized using a microwave-hydrothermal process. The effect of pH on the crystallization of the ZrO₂ powders was investigated. The phase and microstructure of ZrO₂ powders were examined using X-ray diffraction (XRD), Raman spectroscopy, and transmission electron microscopy (TEM). Results show that pure m-ZrO₂ can be obtained at low pH (pH<2). Pure t-ZrO₂ is formed at pH = 7 and 14. The size of the ZrO₂ crystals is in the range of 8-26 nm and decreases with increasing pH. The formation of m-ZrO₂ results from the precipitation of ZrO₂ from solution. The t-ZrO₂ is formed through the in-situ structural rearrangement of amorphous Zr(OH)_xO_y. The stabilization of t-ZrO₂ is attributed to the small crystal size and the adsorption of hydroxy ions on the surfaces of the crystals.

Original language	English
Pages (from-to)	68-73
Number of pages	6
Journal	Journal Wuhan University of Technology, Materials Science Edition
Volume	31
Issue number	1
DOIs	https://doi.org/10.1007/s11595-016-1332-9
State	Published - 1 Feb 2016

Keywords

crystallization mechanism
microwave-hydrothermal
nanocrystalline zirconia
pH

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title = "Effect of pH on crystallization of nanocrystalline zirconia in a microwave-hydrothermal process",

abstract = "Nanocrystalline zirconia (ZrO2) was synthesized using a microwave-hydrothermal process. The effect of pH on the crystallization of the ZrO2 powders was investigated. The phase and microstructure of ZrO2 powders were examined using X-ray diffraction (XRD), Raman spectroscopy, and transmission electron microscopy (TEM). Results show that pure m-ZrO2 can be obtained at low pH (pH<2). Pure t-ZrO2 is formed at pH = 7 and 14. The size of the ZrO2 crystals is in the range of 8-26 nm and decreases with increasing pH. The formation of m-ZrO2 results from the precipitation of ZrO2 from solution. The t-ZrO2 is formed through the in-situ structural rearrangement of amorphous Zr(OH)xOy. The stabilization of t-ZrO2 is attributed to the small crystal size and the adsorption of hydroxy ions on the surfaces of the crystals.",

keywords = "crystallization mechanism, microwave-hydrothermal, nanocrystalline zirconia, pH",

author = "Haibo Ouyang and Cuiyan Li and Kezhi Li and Hejun Li and Yulei Zhang",

note = "Publisher Copyright: {\textcopyright} 2016, Wuhan University of Technology and Springer-Verlag Berlin Heidelberg.",

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doi = "10.1007/s11595-016-1332-9",

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T1 - Effect of pH on crystallization of nanocrystalline zirconia in a microwave-hydrothermal process

AU - Ouyang, Haibo

AU - Li, Cuiyan

AU - Li, Kezhi

AU - Li, Hejun

AU - Zhang, Yulei

PY - 2016/2/1

Y1 - 2016/2/1

N2 - Nanocrystalline zirconia (ZrO2) was synthesized using a microwave-hydrothermal process. The effect of pH on the crystallization of the ZrO2 powders was investigated. The phase and microstructure of ZrO2 powders were examined using X-ray diffraction (XRD), Raman spectroscopy, and transmission electron microscopy (TEM). Results show that pure m-ZrO2 can be obtained at low pH (pH<2). Pure t-ZrO2 is formed at pH = 7 and 14. The size of the ZrO2 crystals is in the range of 8-26 nm and decreases with increasing pH. The formation of m-ZrO2 results from the precipitation of ZrO2 from solution. The t-ZrO2 is formed through the in-situ structural rearrangement of amorphous Zr(OH)xOy. The stabilization of t-ZrO2 is attributed to the small crystal size and the adsorption of hydroxy ions on the surfaces of the crystals.

AB - Nanocrystalline zirconia (ZrO2) was synthesized using a microwave-hydrothermal process. The effect of pH on the crystallization of the ZrO2 powders was investigated. The phase and microstructure of ZrO2 powders were examined using X-ray diffraction (XRD), Raman spectroscopy, and transmission electron microscopy (TEM). Results show that pure m-ZrO2 can be obtained at low pH (pH<2). Pure t-ZrO2 is formed at pH = 7 and 14. The size of the ZrO2 crystals is in the range of 8-26 nm and decreases with increasing pH. The formation of m-ZrO2 results from the precipitation of ZrO2 from solution. The t-ZrO2 is formed through the in-situ structural rearrangement of amorphous Zr(OH)xOy. The stabilization of t-ZrO2 is attributed to the small crystal size and the adsorption of hydroxy ions on the surfaces of the crystals.

KW - crystallization mechanism

KW - microwave-hydrothermal

KW - nanocrystalline zirconia

KW - pH

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DO - 10.1007/s11595-016-1332-9

M3 - 文章

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SN - 1000-2413

VL - 31

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EP - 73

JO - Journal Wuhan University of Technology, Materials Science Edition

JF - Journal Wuhan University of Technology, Materials Science Edition

IS - 1

ER -

Effect of pH on crystallization of nanocrystalline zirconia in a microwave-hydrothermal process

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Keywords

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