Role of paramagnetic defects in light emission processes in Y-doped ZrO<sub>2</sub>nanopowders

Korsunska, N.; Baran, M.; Zhuk, A. G.; Polishchuk, Yu.; Stara, T.; Kladko, V. P.; Bacherikov, Yu. Yu.; Venger, Ye.; Konstantinova, T. E.; Khomenkova, L.

doi:10.1088/2053-1591/1/4/045011

Cited by 16 publications

(14 citation statements)

References 22 publications

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“…These TEM results are consistent with our earlier study of Ydoped ZrO 2 powders. [16,17] It was observed that the increase of the calcination time resulted in the growing of the nanocrystal sizes while their structure was mostly unchanged. These results are also in an agreement with the data of Refs.…”

Section: Tem Observationsmentioning

confidence: 99%

Effect of Cooling Rate on Dopant Spatial Localization and Phase Transformation in Cu‐Doped Y‐Stabilized ZrO₂ Nanopowders

Korsunska

Baran

Vorona

et al. 2017

physica status solidi c

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The effect of calcination temperature (TC = 500–1000 °C) and cooling rate on the dopant distribution in Cu‐doped Y‐stabilized ZrO2 nanopowders is studied. The powders are produced by co‐precipitation technique and investigated by attenuated total reflection, UV‐vis diffuse reflectance, electron paramagnetic resonance, and transmission electron microscopy methods. The cooling rate is found to affect the amount of Cu substances on grain surface, the powders subjected to fast cooling (quenching) showed higher amount of Cu‐related complexes on the grains’ surface than their counterparts cooled with furnace after calcination. It is observed that Cu impurities diffuse inside ZrO2 grains from Cu‐related surface substances when TC < 800 °C. This process is accompanied by the enhancement of 275‐nm absorption band caused by oxygen vacancies formation. For TC > 800 °C, outward migration of Cu dopants takes place. Simultaneously, the intensity of 275‐nm absorption band decreases, the monoclinic ZrO2 phase forms and its contribution rises with TC. It is proposed that monoclinic phase formation is caused by the replacement of Cu atoms from lattice sites to interstitials leading to an appearance of the channels for Y out‐diffusion via cation vacancies and destabilization of ZrO2 tetragonal phase.

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Section: Tem Observationsmentioning

confidence: 99%

Effect of Cooling Rate on Dopant Spatial Localization and Phase Transformation in Cu‐Doped Y‐Stabilized ZrO₂ Nanopowders

Korsunska

Baran

Vorona

et al. 2017

physica status solidi c

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“…[6][7][8][21][22][23][24][25] This PL emission originates from defect states caused by the different structural defects [6][7][8]22 that can explain a variety of observed PL bands. These latter are attributed usually to intrinsic defects such as oxygen vacancies 26 or their complexes located in the crystal volume, 6,27 at grain surface 7 or near impurities.…”

mentioning

confidence: 99%

Structural and Luminescent Properties of (Y,Cu)-Codoped Zirconia Nanopowders

Korsunska

Baran

Polishchuk

et al. 2015

ECS J. Solid State Sci. Technol.

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The effect of both CuO content (1 and 8 mol%) and calcination temperature (T c = 500-1000 • C) on light emitting and structural properties of ZrO 2 -Y 2 O 3 -CuO nanopowders was studied by photoluminescence (PL), X-ray diffraction (XRD) and Raman scattering methods. The samples, calcinated at T c = 500-700 • C, contain the tetragonal ZrO 2 phase predominantly. The increase of T c results in its transformation to monoclinic one, and the phase transformation happens at higher temperature at higher Cu content. It is shown that the increase of T c from 500 to 800 • C results in the Cu incorporation into nanocrystals from the surface entities. This manifests itself in the shift of XRD and Raman peaks of tetragonal phase. The PL spectra demonstrate the presence of two main PL components peaked at about 540 nm and 630 nm in the most samples. The increase of T c from 500 to 1000 • C results in the non-monotonic variation of total PL intensity as well as in minor changes in PL spectra shape. The evolution of PL intensity is explained by both the increase of a crystallinity degree and the variation of the concentration of non-radiative recombination centres. The transformation of PL spectra shape is ascribed to the appearance of radiative Cu Zr centres.

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“…In Cu-1 samples calcined at T c = 500-600 • C, the XRD peaks at 2θ∼30, 35, 50, and 60 • correspond to either tetragonal or cubic phases. However, the presence of the peak at 2θ = 74.2 • shows that the phase is mainly tetragonal (possibly with low content of cubic one) (Srinivasan et al, 1991;Korsunska et al, 2014). In fact, this peak coincides with the peak observed at higher T c (up to T c = 800 • C), when the XRD patterns clearly show the presence of both peaks 74.2 • and 73 • typical for tetragonal phase.…”

Section: Xrd Studymentioning

confidence: 55%

“…Another reason for this XRD peak shift for the Cu-1 sample calcined at 1,000 • C could be the sintering of nanocrystallites, which stretches the tetragonal phase due to direct contact with the monoclinic one. Such an effect was observed in copperdoped samples obtained from Zr nitrate (Korsunska et al, 2014(Korsunska et al, , 2017. It was shown that calcination at high temperatures stimulates the Cu out-diffusion from nanocrystals and formation of surface CuO favoring the sintering process.…”

Section: Discussionmentioning

confidence: 82%

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Peculiarities of Thermally Activated Migration of Subvalent Impurities in Cu-Doped Y-Stabilized ZrO2 Nanopowders Produced From Zr Oxychlorides

et al. 2018

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Role of paramagnetic defects in light emission processes in Y-doped ZrO₂nanopowders

Cited by 16 publications

References 22 publications

Effect of Cooling Rate on Dopant Spatial Localization and Phase Transformation in Cu‐Doped Y‐Stabilized ZrO₂ Nanopowders

Effect of Cooling Rate on Dopant Spatial Localization and Phase Transformation in Cu‐Doped Y‐Stabilized ZrO₂ Nanopowders

Structural and Luminescent Properties of (Y,Cu)-Codoped Zirconia Nanopowders

Peculiarities of Thermally Activated Migration of Subvalent Impurities in Cu-Doped Y-Stabilized ZrO2 Nanopowders Produced From Zr Oxychlorides

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Role of paramagnetic defects in light emission processes in Y-doped ZrO2nanopowders

Cited by 16 publications

References 22 publications

Effect of Cooling Rate on Dopant Spatial Localization and Phase Transformation in Cu‐Doped Y‐Stabilized ZrO2 Nanopowders

Effect of Cooling Rate on Dopant Spatial Localization and Phase Transformation in Cu‐Doped Y‐Stabilized ZrO2 Nanopowders

Structural and Luminescent Properties of (Y,Cu)-Codoped Zirconia Nanopowders

Peculiarities of Thermally Activated Migration of Subvalent Impurities in Cu-Doped Y-Stabilized ZrO2 Nanopowders Produced From Zr Oxychlorides

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Role of paramagnetic defects in light emission processes in Y-doped ZrO₂nanopowders

Effect of Cooling Rate on Dopant Spatial Localization and Phase Transformation in Cu‐Doped Y‐Stabilized ZrO₂ Nanopowders

Effect of Cooling Rate on Dopant Spatial Localization and Phase Transformation in Cu‐Doped Y‐Stabilized ZrO₂ Nanopowders