Title

High-Resolution And Analytical Tem Investigation Of Metastable-Tetragonal Phase Stabilization In Undoped Nanocrystalline Zirconia

Keywords

AEM (PEELS, EDXS); Conventional TEM; High-Resolution TEM; Nanocrystalline ZrO 2; Sol-Gel Synthesis

Abstract

Submicron and nano-sized nanocrystalline pure zirconia (ZrO 2) powders having metastable tetragonal and tetragonal-plus-monoclinic crystal structures, respectively, were synthesized using the sol-gel technique. The as-precipitated and the calcinated ZrO 2 powders were analyzed for their morphology, nanocrystallite size and structures, aggregation tendency, local electronic properties, and elemental compositions by conventional and high-resolution transmission electron microscopy and field-emission analytical electron microscopy, including energy-dispersive X-ray and electron energy-loss spectroscopies. The results from this study indicate that a combination of nanocrystallite size, strain-induced grain-growth confinement, and the simultaneous presence of the monoclinic phase can lead to stabilization of the metastable tetragonal-phase in undoped ZrO 2. As a result, the tetragonal phase is stabilized within ZrO 2 nanocrystallites up to 100 nm in size, which is 16 times larger than the previously reported critical size of 6 nm.

Publication Date

9-1-2004

Publication Title

Journal of Nanoscience and Nanotechnology

Volume

4

Issue

7

Number of Pages

867-875

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1166/jnn.2004.110

Socpus ID

7944233089 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/7944233089

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