Study of structural, and optical properties of the layered perovskite La2Ti2O7 nanoparticle

Tuyikeze, V.; Omari, L.H.; Bouhbou, M.; Boudali, A.; Fraija, F.

doi:10.1016/j.matpr.2020.04.190

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…According to the calculated values shown in Table 3, has been decreased from 3.69 eV to 3.51 eV and to 3.65 eV, respectively, for LCTO and LBTO nanoparticle, this decrease may be due to mixtures of oxidation degrees (+3/+4) for Ce or (+3/+5) for Bi. It is noticed that the value of the energy gap for LTO compound found experimentally is in agreement with a theoretical study of Ab-initio reported in the literature [31] and in our previous study [32].…”

Section: Optical Propertiessupporting

confidence: 91%

Investigation of structural, optical and dispersion parameters of La2−xAxT
Tuyikeze
¹
,
Omari
²
,
Fraija
³

2021
Optik
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Lanthanum titanate nanoparticles of La2-xAxTi2O7 (the undoped is denoted by LTO and the monodoped with Bi, Ce, and Y is denoted by LBTO, LCTO and LYTO, respectively) were prepared by sol-gel route. X-ray diffraction (XRD) reveals that these compounds crystallize as a monoclinic layered perovskite-like structure with a space group P21. UV-visible diffuse reflectance spectroscopy was employed to characterize the optical properties and hence the dispersion parameters. Optical transmittance and reflectance were investigated to obtain more in-depth insight into the optical properties and optoelectronic behavior of studied nanoparticles.The data collected reveal that the samples have a wide band gap (Eg) that varies between 3.50 and 3.88 eV. By introducing the Ce ion into the host matrix LTO, the optical gap energy was decreased from 3.69 to 3.51 eV despite a low doping content of 5%. However, the Urbach energy (EU) was increased from 0.28 to 0.85 eV. The dispersion of the refractive index has been studied in terms of a single oscillator by the Wemple and Di-Domenico (WDD) model as well as important parameters such as the dispersion energy Ed, the excitation energy Eo and the third-order nonlinear (NL) optical susceptibility χ (3) . Ed and E0 parameters have a crucial role in identifying the characteristics of optical materials and allow the calculations of the factors required for the design of spectral dispersion and optical communication devices.

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Section: Optical Propertiessupporting

confidence: 91%

Investigation of structural, optical and dispersion parameters of La2−xAxT
Tuyikeze
¹
,
Omari
²
,
Fraija
³

2021
Optik
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“…However, the c-axis lattice constant of La 2 Ti 2 O 7 was 13.01 Å. 41 The b-axis lattice constant of LSTN 0.125 was higher than that of La 2 Ti 2 O 7 . This was attributed to the lattice distortion caused by Nb 5+ and Sr 2+ ions substituting Ti 4+ and La 3+ ions, respectively, in the lattice of La 2 Ti 2 O 7 .…”

Section: 4mentioning

confidence: 90%

Optimal Nb⁵⁺ doping for enhanced optical reflectivity and improved thermophysical properties of La_0.9Sr_0.1Ti₁₋_xNb_xO₃₊_δ

Zhu

Wang

et al. 2022

J Am Ceram Soc.

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Thermal protection materials with high optical reflectivity, low thermal conductivity, and good high‐temperature stability are required for the development of laser technologies and the protection of the critical equipment components. Herein, we synthesize a novel thermal protective material, La0.9Sr0.1Ti1−xNbxO3+δ (LSTN; x = 0.1, 0.125, 0.15), with different Nb5+‐ion contents using solid‐state sintering. Phase structure analysis demonstrates that LSTN (x = 0.1, 0.125, 0.15) presents a single‐phase monoclinic structure with a uniform element distribution. In particular, the LSTN0.125 ceramic exhibits ultrahigh optical reflectivity (96%, 2300 nm) and excellent thermophysical properties, such as a high thermal expansion coefficient (10.3 × 10−6 K−1, 1000°C), an ultralow thermal conductivity (0.408 W (m K)−1, 300°C), and excellent high‐temperature stability. Aberration‐corrected scanning transmission electron microscopy reveals that the disordered substitution of Nb5+ ions induces numerous lattice distortions and mass fluctuations, which decrease the thermal conductivity, and makes difference in the relative refractive indices of atomic layers causing the high reflectivity of the material. These remarkable properties render the LSTN0.125 ceramic as an ideal alternative for near‐infrared thermal protection applications.

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“…In addition, the perovskite family has been the subject of many studies, due to its environmental stability, low toxicity, and its promising optoelectronic features. 5,6 However, for environmental reasons, the scientific community is looking for new materials capable of replacing the lead-based compounds (which is toxic), among the possible choices are the chalcogenides of interalkalis. They were seen as good alternatives to ferrous materials, their ingredients exist abundantly now and are available at cheaper and nontoxic prices.…”

mentioning

confidence: 99%

Structural, Mechanical, Electronic and Optical Properties of KNaY (Y = S, Se and Te) as Ferroelectric Compounds

Chaib

Chakhchaoui

Rana

et al. 2021

ECS J. Solid State Sci. Technol.

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The purpose of this work is an exploration of new materials which show ferroelectric behavior. We have analyzed the structural, mechanical, electronic, and optical properties of ternary inter-alkali chalcogenide compounds KNaY (Y = S, Se and Te) using the first principal calculations. The atomic positions and structural parameters are in agreement with other studies. The elastic parameters designate that these compounds have a fragile behavior on the other hand. The electronic band structure calculations suggest that these compounds are semiconductors with a direct energy band gap and anionic character, in agreement with literature data. The optical properties show that these compounds can be a good candidate for optoelectronic devices.

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Study of structural, and optical properties of the layered perovskite La2Ti2O7 nanoparticle

Cited by 5 publications

References 20 publications

Investigation of structural, optical and dispersion parameters of La2−xAxT
Tuyikeze
¹
,
Omari
²
,
Fraija
³

2021
Optik
Self Cite
3
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2
0
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Investigation of structural, optical and dispersion parameters of La2−xAxT
Tuyikeze
¹
,
Omari
²
,
Fraija
³

2021
Optik
Self Cite
3
0
2
0
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Optimal Nb⁵⁺ doping for enhanced optical reflectivity and improved thermophysical properties of La_0.9Sr_0.1Ti₁₋_xNb_xO₃₊_δ

Structural, Mechanical, Electronic and Optical Properties of KNaY (Y = S, Se and Te) as Ferroelectric Compounds

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Study of structural, and optical properties of the layered perovskite La2Ti2O7 nanoparticle

Cited by 5 publications

References 20 publications

Investigation of structural, optical and dispersion parameters of La2−xAxTTuyikeze1, Omari2, Fraija3 2021OptikSelf Cite3020View full textAdd to dashboardCite

Investigation of structural, optical and dispersion parameters of La2−xAxTTuyikeze1, Omari2, Fraija3 2021OptikSelf Cite3020View full textAdd to dashboardCite

Optimal Nb5+ doping for enhanced optical reflectivity and improved thermophysical properties of La0.9Sr0.1Ti1−xNbxO3+δ

Structural, Mechanical, Electronic and Optical Properties of KNaY (Y = S, Se and Te) as Ferroelectric Compounds

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Investigation of structural, optical and dispersion parameters of La2−xAxT
Tuyikeze
¹
,
Omari
²
,
Fraija
³

2021
Optik
Self Cite
3
0
2
0
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Investigation of structural, optical and dispersion parameters of La2−xAxT
Tuyikeze
¹
,
Omari
²
,
Fraija
³

2021
Optik
Self Cite
3
0
2
0
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Optimal Nb⁵⁺ doping for enhanced optical reflectivity and improved thermophysical properties of La_0.9Sr_0.1Ti₁₋_xNb_xO₃₊_δ