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Spinal and Spinel-zirconia Composite Material Prepared at Low Temperature by Al13 as Aluminium Source

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Author(s): ZHANG Zhi-Jie,ZHONG Ming-Feng

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 24;
Issue: 5;
Start page: 934;
Date: 2009;
Original page

Keywords: Al13 | spinel | spinel-zirconia | low temperature synthesize

ABSTRACT
Spinel and spinel-zirconia composite powder were synthesized by soft chemistry method using £ځlO4Al12(OH) 24(H2O) 12£ۼSUP>7+£¨abbreviated Al13£© as aluminum source. Precursor structure, reaction progress and material microª²structure evolvement were characterized by 27Al NMR, XRD, DSC-TG and FTIR. Spinel precursor was prepared by mixing Al13 solution and magnesium slurry which was obtained by milling the mixture of MgCl2¡¤6H2O and NaOH, and its component included Mg6Al2CO3(OH)16¡¤4H2O and ¦-Al(OH)3. Spinel is formed from calcination of this spinel precursor at 600¡䟦or 1h, and only spinel is formed at even higher temperatures. Spinel-zirconia composite powder precursor is prepared by hydrolysis-precipitation process of Al13, MgCl2¡¤6H2O and ZrOCl2¡¤8H2O solution. Spinel-zirconia composite powder can also be obtained from calcination of the precursor at 600¡䬠FTIR spectra of the Al13 powder and spinelª²zirconia precursor show that the £ځlO6£۠absorption band shifts from 608cm-1 to 601cm-1 and £ځlO4£۠from 761cm-1 to 723cm-1.The result shows that Al13 has obvious advantage in synthesis of spinel and spinelª²zirconia composite powders at low temperature because Al-O-Mg bond can be formed easily in precursors.
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