Effects of the counter-cation nature and preparation method on the structure of La2Zr2O7

Duarte, William; Meguekam, A.; Colas, Maggy; Vardelle, Michel; Rossignol, Sylvie

doi:10.1007/s10853-014-8606-4

Cited by 17 publications

(5 citation statements)

References 39 publications

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“…Coprecipitation method can lead to synthesize high purity compounds with a homogeneous composition at relatively low temperature but the obtained powders have large size. Thus a grinding stage is essential to synthesize a compound with small size [29,30].…”

Section: Advantages and Disadvantages Of These Methodsmentioning

confidence: 99%

Rare-Earth-Based Materials for Heterogeneous Photocatalysis

Zinatloo-Ajabshir¹,

Sayyar²

2019

Concepts of Semiconductor Photocatalysis

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Recently, the synthesis of rare-earth-based nanostructures as a significant class of materials with photocatalysis activity has attracted the attention of researchers. Many studies have shown their applications in various fields, specifically in photocatalysis. There are different methods to synthesis of rare-earth nanostructures. In this study, we discuss about modification of rare-earth-based materials. Also production methods and their advantages and disadvantages have been presented, briefly. Finally, photocatalytic applications of rare-earth nanostructures are highlighted.

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Section: Advantages and Disadvantages Of These Methodsmentioning

confidence: 99%

Rare-Earth-Based Materials for Heterogeneous Photocatalysis

Zinatloo-Ajabshir¹,

Sayyar²

2019

Concepts of Semiconductor Photocatalysis

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“…Rare earth-based materials are known for their use in the field of high and low temperature fuel cells, gas storage/separation, heterogeneous photo-catalysis, wastewater treatment, fluorescence and photoelectrochemical water. A different example of these materials could be cited as La 2 Zr 2 O 7 , known as a semiconductor, with a band gap of 3.82 eV [11], its optical and electronic properties are modified using Ce doping at Zr site, new transitions appeared in the absorption spectra for 3.4% Ce doped La 2 Zr 2 O 7 [12]. The modified system shows an interesting behavior in its thermal conductivity, which increases as a function of temperature compared to the pure La 2 Zr 2 O 7 .…”

Section: Introductionmentioning

confidence: 99%

“…The synthesis by a different procedure of Dy 2 Ce 2 O 7 and Dy 2 Zr 2 O 7 reported in Refs. [14][15][16][17] show a good thermal stability during this process obtaining a pure phase of Dy 2 Ce 2 O 7 at 1500 • C.…”

Section: Introductionmentioning

confidence: 99%

The investigation of optical and photocatalytic properties in Dy2M2O7 (M= Hf, Zr and Ce ) 

Zaari¹,

Ouassoul²,

Mezzat³

et al. 2023

Rev. Mex. Fís.

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This paper aims to present a group of compounds Dy2M2O7 (with M = Hf, Ce and Zr) which could be an alternative having the same function as TiO2. Based on our studies and those reported in the literature, we will discuss in detail the roles and the functional mechanism of the catalysts. The results show that Zr2Dy2O7 is the best candidate to be a photo-catalyst: it has a band gap close to 2.2 eV, and a good absorption in visible range compared to the other compound having absorption in UV. The quantum efficiency of Zr2Dy2O7 reaches up to 3%, and the limit of conduction band and valence band are localized in potential redox zone. Doping with Cerium gives another energy level, which allows having other optical transitions and improving the absorption and reaching the quantum efficiency to 4% in a visible range.

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“…17 Large amounts of powder can be obtained using this method, but the powder may be heterogeneous in composition, thus requiring numerous grinding steps followed by calcination. 18 Rodriguez et al prepared Ln 2 Zr 2 O 7 (Ln: La, Nd, Gd, and Dy) phosphors through the sol-gel method. 19 Furthermore, Amalesh et al prepared Er 3+ /Li + doped Y 2 Zr 2 O 7 nanocrystals through the hydrothermal approach, but this process took a long time.…”

Section: Introductionmentioning

confidence: 99%

“…prepared Gd 2 Zr 2 O 7 :Eu 3+ phosphors through the coprecipitation technique 17 . Large amounts of powder can be obtained using this method, but the powder may be heterogeneous in composition, thus requiring numerous grinding steps followed by calcination 18 . Rodriguez et al.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence and temperature sensing properties of Zr⁴⁺ and Er³⁺ codoped Y₂O₃ prepared by laser annealing

Zhao,

Deng,

Yang

et al. 2023

J Am Ceram Soc.

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Y2O3 codoped with different Zr4+ (10% mol, 30% mol, and 49% mol) and constant Er3+ (2% mol) ions were successfully prepared via the laser annealing method. According to the XRD data, the lattice parameters decrease with the increase of Zr4+, and the grain size increases with Zr4+. The crystal space group switches from Ia‐3 to Fm‐3 m at a Zr4+ concentration of 49% mol. As the concentration of doped Zr4+ increases, the upconversion emission of Er3+ decreases. The nonequivalent substitution of Y3+ by Zr4+ creates lattice defects, which affect the fluorescence intensity of Er3+ ions in the material. The temperature sensing behavior of Y88%Zr10%Er2%O1.55 crystals based on the fluorescence intensity ratio between 4S3/2→4I15/2 and 4I9/2→4I15/2 transitions of Er3+ is studied. The results show that after codoping with Zr4+, the 4S3/2→4I15/2 and 4I9/2→4I15/2 transitions satisfy the Boltzmann distribution formula at temperatures above 333K. And the temperature sensing relative sensitivity can reach 2.96%K−1.

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Effects of the counter-cation nature and preparation method on the structure of La2Zr2O7

Cited by 17 publications

References 39 publications

Rare-Earth-Based Materials for Heterogeneous Photocatalysis

Rare-Earth-Based Materials for Heterogeneous Photocatalysis

The investigation of optical and photocatalytic properties in Dy2M2O7 (M= Hf, Zr and Ce )

Fluorescence and temperature sensing properties of Zr⁴⁺ and Er³⁺ codoped Y₂O₃ prepared by laser annealing

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Effects of the counter-cation nature and preparation method on the structure of La2Zr2O7

Cited by 17 publications

References 39 publications

Rare-Earth-Based Materials for Heterogeneous Photocatalysis

Rare-Earth-Based Materials for Heterogeneous Photocatalysis

The investigation of optical and photocatalytic properties in Dy2M2O7 (M= Hf, Zr and Ce )

Fluorescence and temperature sensing properties of Zr4+ and Er3+ codoped Y2O3 prepared by laser annealing

Contact Info

Product

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The investigation of optical and photocatalytic properties in Dy2M2O7 (M= Hf, Zr and Ce ) 

Fluorescence and temperature sensing properties of Zr⁴⁺ and Er³⁺ codoped Y₂O₃ prepared by laser annealing