Defect microstructures of TiO{sub 2} rutile due to Zr{sup 4+} dissolution and expulsion

Journal Article · Wed Nov 15 04:00:00 EST 2006 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2006.07.020· OSTI ID:20900888

Yang, K C ^[1]; Shen, P ^[1]; Gan, D ^[1]

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1. Institute of Materials Science and Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan (China)

Defect microstructure of Zr-dissolved TiO{sub 2} polycrystals, homogenized as rutile structure at 1600 deg. C and then aged at 900 deg. C for 2-200 h in air, was characterized by analytical electron microscopy. Diffuse diffractions occurred at 1/2(211) as a result of Zr{sup 4+} substitution for Ti{sup 4+} with volume/charge compensating defect clusters. Upon annealing at 900 deg. C, plate-like Guinier and Preston (G.P.) zone appeared with the plate surface parallel to (100) and (010) and in association with dislocations. Commensurate superstructures with apparent triple {l_brace}101{r_brace} and {l_brace}111{r_brace} periodicity also occurred as metastable intermediates, which are presumably the precursor of the equilibrium ZrTi{sub 2}O{sub 6} precipitate. -- Graphical abstract: TEM image of Zr-doped rutile viewed along its c-axis showing two variants of plate-like precipitates formed during aging at 900 deg. C for 200 h.

• OSTI ID: 20900888
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 11 Vol. 179; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
DEFECTS
DIFFRACTION
DISLOCATIONS
DISSOLUTION
DOPED MATERIALS
ELECTRON MICROSCOPY
MICROSTRUCTURE
POLYCRYSTALS
PRECIPITATION
RUTILE
SURFACES
TEMPERATURE RANGE 1000-4000 K
TITANIUM IONS
TITANIUM OXIDES
ZIRCONIUM IONS