On the size-dependent phase transformation in nanoparticulate zirconia

Chráska, Tomáš; King, Alexander H.; Berndt, C. C.

doi:10.1016/s0921-5093(00)00625-0

Cited by 245 publications

(175 citation statements)

References 31 publications

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“…TEM of Er 3+ doped and Er 3+ /Li + codoped ZrO 2 under 800 • C sintering are shown in Fig. 2, from which the variations of everage radii and phases can be clearly seen, 13 which is consistent with the XRD data. A small deviation in the estimated particle sizes by TEM and XRD may result since XRD refers to coherent domains and TEM images may be polydomain in nature.…”

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confidence: 83%

Enhanced upconversion fluorescence of Er3+:ZrO2 nanocrystals induced by phase transformation

et al. 2012

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In this letter, we demonstrate for the first time a growth of monoclinic phase ZrO2 nanocrytals based on a sol-gel method, compared to the ordinary sol-gel procedure, our method decreases the synthesized temperature from ∼1000 °C to ∼800 °C. In addition, it is found that Er3+ in monoclinic phase ZrO2 nanocrystals have greatly enhanced upconversion emissions under infrared LD excitation due to its lower environmental symmetry

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confidence: 83%

Enhanced upconversion fluorescence of Er3+:ZrO2 nanocrystals induced by phase transformation

et al. 2012

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“…1(a). The average grain size is 4 mm, which is much larger than the critical size for size stabilization of tetragonal phase (<200 nm) [23,24]. For the micron-sized crystals to be discussed in this work, therefore, only the dopant Y 2 O 3 is considered as a tetragonal phase stabilizer.…”

Section: Materials Preparation and Characteristicsmentioning

confidence: 99%

In-situ studies on martensitic transformation and high-temperature shape memory in small volume zirconia

Zeng

Tamura

et al. 2017

Acta Materialia

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Shape memory effect (SME) High temperature deformation High temperature shape memory ceramics a b s t r a c t Recently, the shape memory effect with significant recoverable shape deformation has been discovered in small volume single-crystal zirconia. The application potential for such shape memory ceramics has spurred in-depth exploration of the martensitic transformation crystallography and high temperature shape memory effect. In this work, the martensitic transformation of micron-sized zirconia has been studied in both a pristine as-produced condition and after micromechanical compression, using synchrotron scanning micro X-ray diffraction (mXRD). The pristine zirconia was found to transform into the monoclinic phase via a different crystallographic path than the compressed zirconia, resulting in distinct monoclinic variant preferences. The characteristic martensitic transformation temperatures were also found to be higher after uniaxial compression than in the pristine condition. Such observations provide insight on the differences between stress-induced and thermally-induced martensitic transformation. Moreover, we have observed a full cycle of the shape memory effect with large recoverable strain (7%) in micron-sized zirconia at a temperature of 400 C. Our findings provide an important guideline to tailor the high-temperature shape memory properties of zirconia for further scientific research and engineering applications.

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“…This applies to ZrO 2 whose tphase has a lower surface energy than the m-phase [10,11], and different authors theoretically estimated the critical size of a strain-free crystal as 5 nm [9] or 7 nm [12]. However, experimentally determined critical diameters were invariably higher than the estimates: 18 nm [12], 10-40 nm [13].…”

Section: Introductionmentioning

confidence: 98%

HRTEM observation of the monoclinic-to-tetragonal m-t) phase transition in nanocrystalline ZrO₂

Kasatkin

Girgsdies

Ressler

et al. 2004

Journal of Materials Science

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On the size-dependent phase transformation in nanoparticulate zirconia

Cited by 245 publications

References 31 publications

Enhanced upconversion fluorescence of Er3+:ZrO2 nanocrystals induced by phase transformation

Enhanced upconversion fluorescence of Er3+:ZrO2 nanocrystals induced by phase transformation

In-situ studies on martensitic transformation and high-temperature shape memory in small volume zirconia

HRTEM observation of the monoclinic-to-tetragonal m-t) phase transition in nanocrystalline ZrO₂

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On the size-dependent phase transformation in nanoparticulate zirconia

Cited by 245 publications

References 31 publications

Enhanced upconversion fluorescence of Er3+:ZrO2 nanocrystals induced by phase transformation

Enhanced upconversion fluorescence of Er3+:ZrO2 nanocrystals induced by phase transformation

In-situ studies on martensitic transformation and high-temperature shape memory in small volume zirconia

HRTEM observation of the monoclinic-to-tetragonal m-t) phase transition in nanocrystalline ZrO2

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HRTEM observation of the monoclinic-to-tetragonal m-t) phase transition in nanocrystalline ZrO₂