Vibrational, Thermal, and Physical Characterizations of Some Zinc Niobo Tellurite Glasses Doped with Rare Earth (Eu, Dy)-=SUP=-*-=/SUP=-

In this communication, we report physical and thermal properties along with Raman spectroscopic investigations on Zinc Niobo Tellurite glass systems doped with Eu2O3 and Dy2O3 at the expense of TeO2. The glasses have been synthesized by the melt quenching technique. Physical parameters like density, molar volume, packing density were estimated. The density of the un-doped glasses increases with increasing mol% of the modifier (ZnO) whereas the glass transition temperature (Tg) decreases. We have observed an increase in the density of the base glass systems which are doped with rare earth (RE) dopants. The packing density of the un-doped glasses remains almost constant with increasing modifier content suggesting that there is not much change in the local environment. Raman spectra were recorded at room temperature and assigned to TeO4 and TeO3 structural units in these glasses. The peak shift, full width at half maximum (FWHM) of the de-convoluted Raman peaks were analyzed to get information about the local environment. It is observed that these compositions of tellurite glasses are good host materials for rare earth ions as they offer voids in the network. Further, it was observed that the rare earth ion doping has not affected the local environment of the glasses; Dy3+ ions have a slightly higher tendency to polarize Te-O bonds than the Eu3+ ions. Keywords: Niobium-based tellurite glasses, XRD, DSC, FTIR.

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The Effect of Nd3+ Composition on Judd-Ofelt Analysis of Lithium Niobate Tellurite Glasses Codoped with Er3+

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.268.191 ◽

2017 ◽

Vol 268 ◽

pp. 191-197 ◽

Cited By ~ 1

Author(s):

Nurhafizah Hasim ◽

Md Supar Rohani

Keyword(s):

Rare Earth ◽

Glass Network ◽

Rare Earth Ions ◽

Oscillator Strengths ◽

Tellurite Glasses ◽

Melt Quenching ◽

Intensity Parameters ◽

Doped Glasses ◽

Rare Earth Doped ◽

Covalent Nature

The modification of absorption characteristics in rare-earth doped tellurite glasses is important in photonics application. The Er3+/Nd3+ doped glasses of the form (69-x)TeO2–15Li2CO3–15Nb2O5–1Er2O3 -(x)Nd2O3 with x =0.2 and 0.6 mol% are successfully made by using conventional melt-quenching technique. The Judd-Ofelt analysis is to determine the local structure and bonding in the vicinity of rare-earth ions. The oscillator strengths are calculated from the absorption spectra and used to evaluate Judd-Ofelt intensity parameters (Ωλ, λ=2, 4 and 6). The values of Ω4 and Ω6 change with the increase of Nd3+ concentration is ascribed to the change in glass network structures. The values of Ω2 are increased from 1.53 to 37.13 (10-22) cm2 with the increase of Nd3+ concentration which indicate an increase in the covalent nature of Nd-O bond and less centrosymmetrical the ion sites. The decrease in τrad for each level with the increase of Nd3+ concentration signifies on how fast a particular level gets depopulated. The values of β for the transitions 4G5/2, 2G7/2 → 4I9/2, 2H11/2 → 4I9/2 and 4F9/2 → 4I9/2 are found to lie in between 99.6 to 100.0%.

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Structure, Luminescence, and Magnetic Properties of Crystalline Manganese Tungstate Doped with Rare Earth Ion

Materials ◽

10.3390/ma14133717 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3717

Author(s):

Jae-Young Jung ◽

Soung-Soo Yi ◽

Dong-Hyun Hwang ◽

Chang-Sik Son

Keyword(s):

Magnetic Field ◽

Rare Earth ◽

Sintering Temperature ◽

Luminescent Properties ◽

Concentration Quenching ◽

Rare Earth Ions ◽

Precipitation Method ◽

Rare Earth Ion ◽

Co Precipitation ◽

Quenching Phenomenon

The precursor prepared by co-precipitation method was sintered at various temperatures to synthesize crystalline manganese tungstate (MnWO4). Sintered MnWO4 showed the best crystallinity at a sintering temperature of 800 °C. Rare earth ion (Dysprosium; Dy3+) was added when preparing the precursor to enhance the magnetic and luminescent properties of crystalline MnWO4 based on these sintering temperature conditions. As the amount of rare earth ions was changed, the magnetic and luminescent characteristics were enhanced; however, after 0.1 mol.%, the luminescent characteristics decreased due to the concentration quenching phenomenon. In addition, a composite was prepared by mixing MnWO4 powder, with enhanced magnetism and luminescence properties due to the addition of dysprosium, with epoxy. To one of the two prepared composites a magnetic field was applied to induce alignment of the MnWO4 particles. Aligned particles showed stronger luminescence than the composite sample prepared with unsorted particles. As a result of this, it was suggested that it can be used as phosphor and a photosensitizer by utilizing the magnetic and luminescent properties of the synthesized MnWO4 powder with the addition of rare earth ions.

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Achieving high thermal stability of different rare-earth ions in a single matrix host via the manipulation of the local structure by a solid solution

Physical Chemistry Chemical Physics ◽

10.1039/d0cp00612b ◽

2020 ◽

Vol 22 (28) ◽

pp. 16294-16300

Author(s):

Xiuxia Yang ◽

Lei Zhao ◽

Zhichao Liu ◽

Shuyu Tian ◽

Hao Zhang ◽

...

Keyword(s):

Thermal Stability ◽

Solid Solution ◽

Rare Earth ◽

Local Structure ◽

Local Environment ◽

High Thermal Stability ◽

Rare Earth Ions ◽

Single Matrix ◽

Thermal Stability Of

Manipulating the local environment of CAS by substitution of Al3+–Y3+ for Si4+–Ca2+ to achieve more stability in the structure of CYA.

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Interaction between rare earth ion layer and Cu O layers in RBa 2 Cu 3 O y (R=magnetic rare earth ions)

Physica C Superconductivity ◽

10.1016/0921-4534(89)90691-6 ◽

1989 ◽

Vol 162-164 ◽

pp. 1277-1278 ◽

Cited By ~ 6

Author(s):

Kazuko Sekizawa ◽

Yoshiki Takano ◽

Takimichi Inaba

Keyword(s):

Rare Earth ◽

Rare Earth Ions ◽

Rare Earth Ion ◽

Magnetic Rare Earth

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The magnetic and spectroscopic properties of certain rare-earth double nitrates

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1955.0231 ◽

1955 ◽

Vol 232 (1191) ◽

pp. 458-474 ◽

Cited By ~ 72

Keyword(s):

Rare Earth ◽

Electric Field ◽

Spectroscopic Properties ◽

Rare Earth Ions ◽

Rare Earth Ion ◽

Crystalline Electric Field ◽

Paramagnetic Resonance ◽

Systematic Fashion ◽

Resonance Data ◽

Rare Earth Series

The theory that has been developed for rare-earth ions in crystals is here applied to the double nitrates. The paramagnetic resonance data and certain spectroscopic properties of the different rare-earth double nitrates, depending as they do on the crystalline electric field at a rare-earth ion, are related to the six parameters through which the field is defined. It is found that most of the experimental results can be fitted to values of the parameters that vary in a systematic fashion along the rare-earth series.

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Synthesis, Morphology Control and Luminescent Properties of Rare Earth Ion-Doped CaWO4 Microstructures

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2016.11895 ◽

2016 ◽

Vol 16 (4) ◽

pp. 4029-4034 ◽

Cited By ~ 1

Author(s):

Chunxia Liu ◽

Lixia Yang ◽

Dan Yue ◽

Mengnan Wang ◽

Lin Jin ◽

...

Keyword(s):

Rare Earth ◽

Uv Light ◽

Luminescent Properties ◽

Average Diameter ◽

Rare Earth Ions ◽

X Ray Diffraction ◽

Hydrothermal Route ◽

Rare Earth Ion ◽

X Ray ◽

Facile Hydrothermal Route

Rare earth ions (Tb3+, Eu3+) doped CaWO4 microstructures were synthesized by a facile hydrothermal route without using any templates and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectrum. The results indicate that the asprepared samples are well crystallized with scheelite structure of CaWO4, and the average diameter of the microstructures is 2∼4 μm. The morphology of CaWO4:Eu3+ microstructures can be controllably changed from microspheres to microflowers through altering the doping concentration of Eu3+ from 3% to 35%, and the microflowers are constructed by a number of CaWO4:Eu3+ nanoflakes. Under the excitation of UV light, the emission spectrum of CaWO4:Eu3+ is composed of the characteristics emission of Eu3+ 5D0-7FJ (J = 1, 2, 3, 4) transitions, and that of CaWO4:Tb3+ is composed of Tb3+ 5D4-7FJ (J = 6, 5, 4, 3) transitions. Both of the optimal doping concentrations of Tb3+ and Eu3+ in CaWO4 microstructures are about 5%.

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Optical temperature sensing of rare-earth ion doped phosphors

RSC Advances ◽

10.1039/c5ra16986k ◽

2015 ◽

Vol 5 (105) ◽

pp. 86219-86236 ◽

Cited By ~ 375

Author(s):

Xiangfu Wang ◽

Qing Liu ◽

Yanyan Bu ◽

Chun-Sheng Liu ◽

Tao Liu ◽

...

Keyword(s):

Rare Earth ◽

Temperature Measurement ◽

Large Scale ◽

Temperature Sensing ◽

Rare Earth Ions ◽

Promising Method ◽

Current Status ◽

Rare Earth Ion ◽

Optical Thermometry

Optical temperature sensing is a promising method to achieve the contactless temperature measurement and large-scale imaging. The current status of optical thermometry of rare-earth ions doped phosphors is reviewed in detail.

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Electrical and Raman Spectroscopic Studies on Aurivillius Layered-Pervoskite Ceramics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1154.80 ◽

2019 ◽

Vol 1154 ◽

pp. 80-90

Author(s):

Mohammed Abdul Basheer ◽

Vagmare Gangadhar ◽

Guduru Prasad ◽

Gobburu Subramanya Kumar ◽

Nandi Venkata Prasad

Keyword(s):

Rare Earth ◽

Complex Impedance ◽

Spectroscopic Properties ◽

Spectroscopic Studies ◽

Rare Earth Ions ◽

X Ray Diffraction ◽

Raman Spectroscopic ◽

Solid State Route ◽

A Site ◽

Rare Earth La

Double rare-earth (La; Sm/Gd) substituted Aurivillius family of Bismuth Layered Structured Ferroelectrics (BLSF) namely Bi2.6Sm0.2La0.2TiNbO9 (BSLT; sample-A), Bi2.6Gd0.2La0.2TiNbO9 (BGLT; sample-B), single phase ceramics were prepared by solid state route. In addition, intergrowth (x BSLT - (1-x) BGLT, where x=0.49; sample-C) and solid solution (BSLTx - BGLTy; where x + y=0.4; sample-D) materials were prepared. Dielectric, ferroelectric and Raman spectroscopic properties were studied on the said above materials. The X-ray diffraction analysis and Raman spectra revealed well-formation of stable structure. Though, the sample-C and sample-D have lower coercive field, compared to the sample-A and sample-B, but they exhibited sharp hysterisis loop. Therefore the instrinsic defects of sample-D inhabits more sensitivity towards the ferroelectric behaviour. The results were corroborated to the impedance and dielectrical data. The results were consistent with the SEM micrographs and complex impedance plots. An attempt is made to understand the effect of rare-earth ions on A-site of layered-pervoskite structure, defined as: (Bi2O2)2+(An-1BnO3n+1)2-.The term n represents number of pervoskite blocks interleaved with the bismuth oxide layers.

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