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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41478

Title: Characterization of the irradiation-induced phase transition in the monoclinic polymorph of zirconia
Authors: R.T. Huang
Y.H. Shen
R.H. Huang
J.Y. Hsu
H. Niu
Y.C. Yu
Contributors: 國立臺灣海洋大學:光電科學研究所
Keywords: TEM
Date: 2014
Issue Date: 2017-02-21T05:48:02Z
Publisher: 21st International Conference on Ion Beam Analysis
Abstract: Abstract: Two groups of pure zirconia (ZrO2) specimens with the monoclinic polymorph and distinct nanopowder size ranges of approximately 20–30 nm and 30–60 nm were irradiated separately at room temperature with 100 keV H+ and 3 MeV Fe2+ ions to various fluences. Following TEM observations and XRD analyses, the irradiation with 100 keV protons to a fluence of over 3 × 1015 ions/cm2 was demonstrated to induce transformation from monoclinic (m) to tetragonal (t) phases in the specimen with the size range of approximately 20–30 nm due to the energy crossover that facilitates the m → t transformation. However, the transformation did not occur in the irradiated specimen with the other size range even though the fluence of protons was up to 1 × 1017 ions/cm2. Furthermore, although irradiation with 3 MeV Fe2+ ions brought about low electronic energy loss, the m → t transformation can be induced under the low fluence of 1 × 1014 ions/cm2 because a high level of damage defects (oxygen vacancies) may promote the m → t transformation. Consequently, the largest crystallite size of t-ZrO2 induced by the proton irradiation is approximately 29 nm, as a result of the metastable critical size effect of t-phase zirconia at room temperature.
Relation: 332(1)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41478
Appears in Collections:[光電科學研究所] 期刊論文

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