Synthesis and Optical Property of MgMoO&lt;sub&gt;4&lt;/sub&gt; Crystals

Xavier, Camila Soares; Moura, A. P. de; Longo, Elson; Varela, José Arana; Zaghete, M. A.

doi:10.4028/www.scientific.net/amr.975.243

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…The MgSpray spherical nanoparticles were changed from spherical shape to become faceted particles, mainly in the Mg1000 sample (Figure d). Xavier et al observed similar morphology in synthesized MgMoO 4 by the solid-state method at 1100 °C for 4 h. The heat treatment favored the diffusion and sintering processes caused the growth of these particles.…”

Section: Resultsmentioning

confidence: 81%

Atomistic Perspective on the Intrinsic White-Light Photoluminescence of Rare-Earth Free MgMoO₄ Nanoparticles

Santiago

Oliveira

Ribeiro

et al. 2020

Crystal Growth & Design

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Intrinsic white-light photoluminescent rare-earth free materials are promising candidates in the field of environment-friendly optical devices. They are important because whitelight materials such as LED devices contribute to safe-energy from photoluminescent emission, which simulates daylight in brightness and comfort at home and/or within industrial environments. Thus, it is a natural path that experimental and theoretical efforts can be combined to understand the best way to reach superior photoluminescent properties in materials. The ultrasonic spray pyrolysis method was employed in this study to synthesize shapeoriented MgMoO 4 nanoparticles with different morphologies after heat treament, which exhibits singular photoluminescence emission spectra with intrinsic white-light emission. For a deep discussion on the electronic structure, quantum mechanical calculations at the DFT/B3LYP level were performed such as in monoclinic β-MgMoO 4 bulk in its surfaces combined with the Wulff construction. The wideband approach was considered for investigating fundamental and excited electronic states (singlet and triplet). The morphological analysis indicates a thermal-active morphological modulation that induces the stabilization of hexagonal planes such as (100) and (010). The DFT calculations enabled us to understand the charge-transfer process along [MgO 6 ] and [MoO 4 ] clusters from characterizing fundamental singlet (s) and the excited singlet (s*) and triplet (t*) electronic states.

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Section: Resultsmentioning

confidence: 81%

Atomistic Perspective on the Intrinsic White-Light Photoluminescence of Rare-Earth Free MgMoO₄ Nanoparticles

Santiago

Oliveira

Ribeiro

et al. 2020

Crystal Growth & Design

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“…5. The optical, spectroscopic [27,[34][35][36][37][38][39] and some other [40][41][42] properties of undoped MgMoO 4 have been extensively studied at this moment. Some data are also available in the literature on the spectroscopic properties of MgMoO 4 crystals and powders or nanoparticles doped with Yb 3+ [27,43], Cr 3+ [40,44], Tm 3+ [31], Eu 3+ [45,46], Eu 3+ , Dy 3+ [47] and Eu 3+ ,Bi 3+ [48] ions/ion pairs.…”

Section: Introductionmentioning

confidence: 99%

“…Some data are also available in the literature on the spectroscopic properties of MgMoO 4 crystals and powders or nanoparticles doped with Yb 3+ [27,43], Cr 3+ [40,44], Tm 3+ [31], Eu 3+ [45,46], Eu 3+ , Dy 3+ [47] and Eu 3+ ,Bi 3+ [48] ions/ion pairs. The results of these studies have shown that MgMoO 4 is interesting for applications in scintillators [27,34], phosphors [37,46,49] and laser hosts [31,40]. Along with that, the MgMoO 4 powder is widely used as a catalyst for the dehydrogenation of saturated hydrocarbons [50,51].…”

Section: Introductionmentioning

confidence: 99%

Influence of Ultrahigh Dilution Treatment of the Charge on the Growth and Spectroscopic Properties of Nd:MgMoO4 Potential Laser Crystal

Subbotin,

Didenko,

Titov

et al. 2024

Crystals

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The influence of the charge treatment by ultrahigh dilution (UHD) technology on oxide single crystals grown by the Czochralski technique was studied for monoclinic MgMoO4 crystals doped by 1 at. % of Nd3+ ions. The series of 10 Nd:MgMoO4 crystals was grown from the charges that were subjected to UHD treatment, as well as from the charges treated with two types of control or with no special treatment at all. The grown crystals were studied by X-ray powder diffraction analysis, inductively coupled plasma atomic emission spectroscopy, mass-spectrometry, optical absorption, emission spectroscopy and luminescence kinetic analysis. We found that: (i) wetting of MgO + MoO3 mixture by a water-ethanol solution before calcining leads to some enrichment of the mixture with MoO3, whereas the wetting of the charge after the calcining leads to some enrichment of it with MgO; (ii) congruent melting composition of MgMoO4 crystal is in the field of some MoO3 excess; (iii) the solid-phase solubility of the excess MoO3 in MgMoO4 probably does not depend on temperature, whereas the solid-phase solubility of the excess MgO in MgMoO4 crystal depends on temperature. We suggest that the corresponding solidus line passes through the range of retrograde solubility; (iv) the crystals grown within this range are characterized by the enhanced Nd3+ segregation coefficient between the crystal and the melt (approximately 0.006 versus 0.004); (v) unit cell parameters of MgMoO4 crystal with the excess of MoO3 are larger than those of the crystal of the stoichiometric composition and of the crystal with the excess of MgO; (vi) the shapes of the optical absorption and luminescence spectra of Nd:MgMoO4 crystal do not depend on the charge treatment; (vii) luminescence decay kinetics are single-exponential for all the studied crystals, the luminescence decay time being different for the crystals grown from the charges that underwent different types of treatment; (viii) the luminescence intensity of Nd:MgMoO4 crystal grown from the charge that underwent UHD treatment before calcining (solid-phase synthesis) is reduced by an order of magnitude in comparison with the other studied crystals.

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Structural and optical properties of MgМоO4 prepared by mechanochemical technique

Gancheva

Rojac

Iordanova

et al. 2022

Ceramics International

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Synthesis and Optical Property of MgMoO<sub>4</sub> Crystals

Cited by 5 publications

References 20 publications

Atomistic Perspective on the Intrinsic White-Light Photoluminescence of Rare-Earth Free MgMoO₄ Nanoparticles

Atomistic Perspective on the Intrinsic White-Light Photoluminescence of Rare-Earth Free MgMoO₄ Nanoparticles

Influence of Ultrahigh Dilution Treatment of the Charge on the Growth and Spectroscopic Properties of Nd:MgMoO4 Potential Laser Crystal

Structural and optical properties of MgМоO4 prepared by mechanochemical technique

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Synthesis and Optical Property of MgMoO<sub>4</sub> Crystals

Cited by 5 publications

References 20 publications

Atomistic Perspective on the Intrinsic White-Light Photoluminescence of Rare-Earth Free MgMoO4 Nanoparticles

Atomistic Perspective on the Intrinsic White-Light Photoluminescence of Rare-Earth Free MgMoO4 Nanoparticles

Influence of Ultrahigh Dilution Treatment of the Charge on the Growth and Spectroscopic Properties of Nd:MgMoO4 Potential Laser Crystal

Structural and optical properties of MgМоO4 prepared by mechanochemical technique

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Atomistic Perspective on the Intrinsic White-Light Photoluminescence of Rare-Earth Free MgMoO₄ Nanoparticles

Atomistic Perspective on the Intrinsic White-Light Photoluminescence of Rare-Earth Free MgMoO₄ Nanoparticles