Publication Type:

Journal Article

Source:

Ceramics International, Elsevier, Volume 40, Number 5, p.6561 - 6568 (2014)

URL:

http://www.sciencedirect.com/science/article/pii/S0272884213015642

Keywords:

Chemical precipitation; Tetragonal Zirconia; Phase stabilization; Cationic and Neutral Polymeric Surfactants; Mineralizer

Abstract:

The influence of cationic (CTAB)/neutral polymeric (PVP) surfactants and strong (NaOH)/weak (NH4OH) alkaline mineralizers on phase stabilization of zirconia nanocrystals synthesized by chemical precipitation is investigated. X-ray diffraction and micro-Raman analysis of the as-prepared samples show that tetragonal zirconia is predominant as compared to monoclinic using \{PVP\} with NH4OH. The phases are also evident from lattice fringes of \{TEM\} images and the corresponding \{SAED\} pattern. Photoluminescence spectra of samples reveal oxygen vacancies present in the zirconia nanocrystals. The group H Raman vibration modes identified are attributed to surface defects and quantum size effects of nanocrystals. The phase stabilization of zirconia nanocrystals is explained using the polymerization rate of tetramers during synthesis. The rate can be varied by proper selection of the surfactant and the mineralizer. A slow polymerization rate with \{PVP\} and \{NH4OH\} favors the formation of tetragonal zirconia. Thus, a simple method for phase stabilization of zirconia nanocrystals at room temperature using chemical precipitation by varying the surfactant and the mineralizer is demonstrated.

Notes:

cited By 2

Cite this Research Publication

Dr. Umamaheswari A., Mohan, S. R., S. Kumar, S., and Sivakumar, M., “Phase tuning of zirconia nanocrystals by varying the surfactant and alkaline mineralizer”, Ceramics International, vol. 40, pp. 6561 - 6568, 2014.

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