Synthesis and crystallization mechanism of europium-titanate Eu2Ti2O7

Mrázek, Jan; Surýnek, Martin; Bakardjieva, Snejana; Buršı́k, Jiřı́; Kašík, Ivan

doi:10.1016/j.jcrysgro.2013.12.045

Cited by 25 publications

(22 citation statements)

References 29 publications

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“…With increasing annealing temperature, the nanocrystal size regularly increased causing a densification of the films and an increase in films' surface roughness. The calculated activation energy of nanocrystal growth was in good agreement with the value of 26.5 kJ·mol −1 reported for nanocrystalline Eu 2 Ti 2 O 7 powders 19 and it was in line with the value of 23.5 kJ·mol −1 reported for Dy 2 Ti 2 O 7 thin films. 11 The application of the luminescence spectroscopy of Eu 3+ ions allows characterizing the structural properties of formed nanocrystals with better resolution than other conventional XRD and electron microscopy methods allow for their limited sensitivity.…”

Section: Discussionsupporting

confidence: 89%

“…In our previous studies, 14,19 we have reported that the crystallization of Eu 2 Ti 2 O 7 powders consists of the homogeneous site-saturated nucleation followed by the three-dimensional growth. In our previous studies, 14,19 we have reported that the crystallization of Eu 2 Ti 2 O 7 powders consists of the homogeneous site-saturated nucleation followed by the three-dimensional growth.…”

Section: Discussionmentioning

confidence: 96%

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Sol‐gel route to nanocrystalline Eu₂Ti₂O₇ films with tailored structural and optical properties

et al. 2019

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We present a generic sol‐gel approach for the preparation of highly transparent europium titanate Eu2Ti2O7 films with tailored structural and optical properties. The films were prepared by a sol‐gel process and thermally treated in a rapid thermal annealing furnace. We determined the effects of the annealing temperature on structural, morphological, and optical properties of the films. We evaluated film's optical constants. The size of the primary nanocrystals and the film's refractive index were tailored by the annealing temperature. The crystallization of Eu2Ti2O7 started at 800°C and the nanocrystals grew with increasing annealing temperature reaching the size from 20 nm to 100 nm. The energy of nanocrystal growth was 21 ± 3 kJ·mol−1. Increasing nanocrystal size caused the regular growth of the refractive index recorded at 632 nm from 2.07 to 2.17 for the films annealed at 800°C and 1200°C, respectively. These results provide fundamental information about the effects of the structure and the morphology of the films on their optical properties. The presented approach can be extended to other rare earth‐doped titanates and these films can be used as passive protective coatings as well as active materials suitable for photonic and spintronic applications.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 96%

Sol‐gel route to nanocrystalline Eu₂Ti₂O₇ films with tailored structural and optical properties

et al. 2019

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“…5) and those of the II – IV centers. Next, the absence in the Raman spectra of the strongest characteristic phonon mode of stannate pyrochlore (around 510 cm −1 67 ) along with the strongly dissimilar emission exhibited by Eu 2 Sn 2 O 7 68–70 grown by us using a sol-gel method 71 (also included in Fig. 5 as orange spectrum) to Eu centers II – IV dismiss the occurrence of this phase in our samples.…”

Section: Resultsmentioning

confidence: 74%

Nanoscale insights into doping behavior, particle size and surface effects in trivalent metal doped SnO2

Cojocaru

Avram

Kessler³

et al. 2017

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Despite considerable research, the location of an aliovalent dopant into SnO2 nanoparticles is far to be clarified. The aim of the present study on trivalent lanthanide doped SnO2 is to differentiate between substitutional versus interstitial and surface versus bulk doping, delineate the bulk and surface defects induced by doping and establish an intrinsic dopant distribution. We evidence for the first time a complex distribution of intrinsic nature composed of substitutional isolated, substitutional associates with defects as well as surface centers. Such multi-modal distribution is revealed for Eu and Sm, while Pr, Tb and Dy appear to be distributed mostly on the SnO2 surface. Like the previously reported case of Eu, Sm displays a long-lived luminescence decaying in the hundreds of ms scale which is likely related to a selective interaction between the traps and the substitutional isolated center. Analyzing the time-gated luminescence, we conclude that the local lattice environment of the lattice Sn is not affected by the particle size, being remarkably similar in the ~2 and 20 nm particles. The photocatalytic measurements employed as a probe tool confirm the conclusions from the luminescence measurements concerning the nature of defects and the temperature induced migration of lanthanide dopants.

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“…L ANTHANIDE titanium oxides crystallizing in a pyrochlore structure with general formula Re 2 Ti 2 O 7 (Re = rareearth element) have been extensively investigated in recent years for their interesting physical and chemical properties. 1 Lanthanides or their oxide compounds have relatively large thermal neutron absorption cross sections, and hence compounds of europium, dysprosium, and gadolinium, including Eu 2 Ti 2 O 7 and Eu 2 TiO 5 , have been considered as potential candidates for use in nuclear reactors as control rod materials. [2][3][4] The introduction of lanthanide ions as luminescence centers in a wide variety of host lattices has been an improvement in the luminescence materials.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Unique Photoluminescence Properties of Eu₂Ti₂O₇ and Eu₂TiO₅

2016

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The europium titania materials, pyrochlore Eu2Ti2O7 and orthorhombic Eu2TiO5, were synthesized from a mixture of Eu2O3 and TiO2 using the solid‐state reaction method. The structural and optical properties of these titania materials were investigated using X‐ray diffraction analysis, photoluminescence (PL) analysis, PL excitation (PLE) spectroscopy, and diffuse reflectance spectroscopy. Temperature dependence of the PL intensity was measured between T = 20 and 450 K and analyzed on the basis of various theoretical models. A remarkable increase in the PL intensity with increasing T was observed in these titania materials at higher temperatures, above ~140 K, and well explained by a trap/reservoir model. Interestingly, a dramatic decrease in the electric‐dipole emission component relative to the magnetic‐dipole one was observed in Eu2Ti2O7 above T ~ 140 K. The schematic energy‐level diagram for Eu3+ in the Eu2Ti2O7 host was proposed for the sake of a better understanding of the PL and PLE processes in this type of phosphorescent material.

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Synthesis and crystallization mechanism of europium-titanate Eu2Ti2O7

Cited by 25 publications

References 29 publications

Sol‐gel route to nanocrystalline Eu₂Ti₂O₇ films with tailored structural and optical properties

Sol‐gel route to nanocrystalline Eu₂Ti₂O₇ films with tailored structural and optical properties

Nanoscale insights into doping behavior, particle size and surface effects in trivalent metal doped SnO2

Synthesis and Unique Photoluminescence Properties of Eu₂Ti₂O₇ and Eu₂TiO₅

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Synthesis and crystallization mechanism of europium-titanate Eu2Ti2O7

Cited by 25 publications

References 29 publications

Sol‐gel route to nanocrystalline Eu2Ti2O7 films with tailored structural and optical properties

Sol‐gel route to nanocrystalline Eu2Ti2O7 films with tailored structural and optical properties

Nanoscale insights into doping behavior, particle size and surface effects in trivalent metal doped SnO2

Synthesis and Unique Photoluminescence Properties of Eu2Ti2O7 and Eu2TiO5

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Product

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Sol‐gel route to nanocrystalline Eu₂Ti₂O₇ films with tailored structural and optical properties

Sol‐gel route to nanocrystalline Eu₂Ti₂O₇ films with tailored structural and optical properties

Synthesis and Unique Photoluminescence Properties of Eu₂Ti₂O₇ and Eu₂TiO₅