Synthesis and characterization of zirconia doped alumina nanopowder by citrate–nitrate process

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 473; no. 1; pp. 360 - 364
• Main Authors: Chandradass, J., Yoon, Jae Hong, Bae, Dong-sik
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 25-01-2008; Elsevier
• Subjects: Alumina–zirconia; Cross-disciplinary physics: materials science; rheology; Crystallization; Differential thermal analysis; Exact sciences and technology; Materials science; Nanopowders; Nanoscale materials and structures: fabrication and characterization; Physics; Transmission electron microscopy; X-ray diffraction; X-ray diffraction; Alumina–zirconia; Differential thermal analysis; Transmission electron microscopy; Crystallization; Aluminium oxide; Alumina-zirconia; Inorganic compounds; Thermal decomposition; Transition element compounds; Doping; XRD; Infrared spectra; Zirconium oxide; Fourier transform spectra; Nanopowder; Spherical particle; Sol-gel process
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2007.04.115

Al
2O
3–ZrO
2 nanopowders containing 5–20
wt.% ZrO
2 was synthesized by a simple aqueous sol–gel method using a citrate polymeric precursor derived from aluminium nitrate, zirconium oxychloride and citric acid mixed solution. The thermal decomposition of the precursor and subsequent formation of α-Al
2O
3 was investigated by differential thermal analysis. X-ray diffraction analysis shows that the phases present at 1200
°C are α-Al
2O
3 and t-ZrO
2 irrespective of zirconia content. The t-ZrO
2 is found to increase with increase in zirconia content. FTIR also confirms the formation of α-Al
2O
3 incorroboration with X-ray studies. TEM micrograph of calcined powder revealed nanosize spherical particle of ∼75
nm. EDAX confirmed the presence of alumina and zirconia particle in the nanopowder calcined at 1200
°C.