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Articles de revues sur le sujet « YVO3 »

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Auteur : Grafiati
Publié le 11 mars 2023

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1

Nugroho, Agustinus Agung, et Thomas T. M. Palstra. « Specific Heat on Single-crystalline YVO3 ». Journal of Magnetism and Its Applications 1, no 1 (2 juin 2021) : 5–8. http://dx.doi.org/10.53533/jma.v1i1.8.

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The specific heat of single-crystalline YVO3 was measured from 2 K up to 250 K at zero field. The results reveal three transitions, at around 75, 115, and 200 K. The transitions at around 115 K and 200 K show that the phase transition is of the second-order type, whereas at around 75 K, unusual features of the specific heat are found. These unusual features are attributed to the effect of a large change in the volume. The specific heat data were analyzed in terms of a lattice contribution, a Schottky contribution and an excess magnetic contribution at high temperature. The magnetic contribution well above the magnetic ordering temperature is ascribed to short-range interactions due to the presence of strong magnetocrystalline anisotropy. The magnetic entropy considered by using this approach is 9.13 J/mole K which is close to the theoretical estimate for the S = 1 system.
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2

Ren, Y., T. Palstra, D. Khomskii, A. Nugroho, A. Menovsky et G. Sawatzky. « Magnetic properties of YVO3 single crystals ». Physical Review B 62, no 10 (septembre 2000) : 6577–86. http://dx.doi.org/10.1103/physrevb.62.6577.

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Mazurenko, D. A., A. A. Nugroho, T. T. M. Palstra et P. H. M. van Loosdrecht. « Optically induced spin disorder in YVO3 ». Journal of Physics : Conference Series 148 (1 février 2009) : 012045. http://dx.doi.org/10.1088/1742-6596/148/1/012045.

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Marquina, C., M. Sikora, M. R. Ibarra, A. A. Nugroho et T. T. M. Palstra. « Lattice effects in YVO3 single crystal ». Journal of Magnetism and Magnetic Materials 290-291 (avril 2005) : 428–30. http://dx.doi.org/10.1016/j.jmmm.2004.11.491.

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5

Kawano, Hazuki, Hideki Yoshizawa et Yutaka Ueda. « Magnetic Behavior of a Mott-Insulator YVO3 ». Journal of the Physical Society of Japan 63, no 8 (15 août 1994) : 2857–61. http://dx.doi.org/10.1143/jpsj.63.2857.

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6

Kikuchi, Jun, Hiroshi Yasuoka, Yasuki Kokubo et Yutaka Ueda. « Antiferromagnetic Nuclear Resonance of51V in LaVO3and YVO3 ». Journal of the Physical Society of Japan 63, no 10 (15 octobre 1994) : 3577–80. http://dx.doi.org/10.1143/jpsj.63.3577.

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7

Jandl, S., A. A. Nugroho et T. T. M. Palstra. « A comparative Raman study between YbVO3and YVO3 ». Journal of Physics : Conference Series 200, no 3 (1 janvier 2010) : 032025. http://dx.doi.org/10.1088/1742-6596/200/3/032025.

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8

Beale, Thomas A. W., Roger D. Johnson, Stewart R. Bland, Peter D. Hatton, Laurence Bouchenoir, Andrew T. Boothroyd et D. Prabhakaran. « Determining Crystal Field Distortions of YVO3 through X-Ray Scattering ». Solid State Phenomena 152-153 (avril 2009) : 147–50. http://dx.doi.org/10.4028/www.scientific.net/ssp.152-153.147.

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We present resonant x-ray scattering experimental data from YVO3. By scattering at the vanadium K edge we are able to observe diffraction from the anisotropic tensor of susceptibility at the Bragg forbidden (010). The resonant energy spectra from these reflections are unusually complex, giving an indication of the crystal field distortions around the vanadium site.
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9

TAKAHASHI, MANABU, et JUN-ICHI IGARASHI. « RESONANT X-RAY SCATTERING IN YTiO3 AND YVO3 ». Surface Review and Letters 09, no 02 (avril 2002) : 1197–201. http://dx.doi.org/10.1142/s0218625x02003512.

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We investigate the Ti and V K edge resonant X-ray scattering spectra in YTiO 3 and YVO 3 by using ab initio band structure calculation based on the local density approximation. The calculated spectra show good agreement with recent experiments, although the effect of the orbital ordering is neglected, while that of the lattice distortion is taken into account in the calculation. Particularly, the observed drastic change of the spectra for the (100) reflection between the low temperature and intermediate temperature phases of YVO 3 is nicely explained by the difference of the Jahn–Teller distortion between the two phases. These results cast doubt on an assertion that the resonant X-ray scattering is a direct observation of the orbital order in YTiO 3 and YVO 3.
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10

Nakotte, H., L. Laughlin, H. Kawanaka, D. N. Argyriou, R. I. Sheldon et Y. Nishihara. « Magnetic properties of single-crystalline Mott insulator YVO3 ». Journal of Applied Physics 85, no 8 (15 avril 1999) : 4850–52. http://dx.doi.org/10.1063/1.370042.

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11

Roberge, Benoit, Serge Jandl, Agung A. Nugroho, Thomas T. M. Palstra, Le D. Tung et Geetha Balakrishnan. « Study of phase coexistence in YVO3 and LaVO3 ». Journal of Raman Spectroscopy 46, no 11 (28 juin 2015) : 1157–60. http://dx.doi.org/10.1002/jrs.4735.

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12

Ren, Y., T. T. M. Palstra, D. I. Khomskii, E. Pellegrin, A. A. Nugroho, A. A. Menovsky et G. A. Sawatzky. « Temperature-induced magnetization reversal in a YVO3 single crystal ». Nature 396, no 6710 (décembre 1998) : 441–44. http://dx.doi.org/10.1038/24802.

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13

Mizokawa, T., D. I. Khomskii et G. A. Sawatzky. « Interplay between orbital ordering and lattice distortions inLaMnO3,YVO3,andYTiO3 ». Physical Review B 60, no 10 (1 septembre 1999) : 7309–13. http://dx.doi.org/10.1103/physrevb.60.7309.

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14

Belik, Alexei A. « Fresh Look at the Mystery of Magnetization Reversal in YVO3 ». Inorganic Chemistry 52, no 15 (22 juillet 2013) : 8529–39. http://dx.doi.org/10.1021/ic401042x.

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15

Bizen, Daisuke, Hironori Nakao, Kazuaki Iwasa, Youichi Murakami, Toyotaka Osakabe, Jun Fujioka, Toshio Yasue, Shigeki Miyasaka et Yoshinori Tokura. « Magnetic Phase Diagrams of YVO3 and TbVO3 under High Pressure ». Journal of the Physical Society of Japan 81, no 2 (15 février 2012) : 024715. http://dx.doi.org/10.1143/jpsj.81.024715.

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16

Kobayashi, H., K. Sakashita, T. Kamimura, H. Kawanaka et Y. Nishihara. « Study of Magnetic Phase Transitions in YVO3 by Non-linear Susceptibility ». Journal of the Magnetics Society of Japan 23, no 1_2 (1999) : 516–18. http://dx.doi.org/10.3379/jmsjmag.23.516.

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17

Belik, Alexei A., Roman V. Shpanchenko et Eiji Takayama-Muromachi. « Carrier-doping metal-insulator transition in solid solutions of CdVO3–YVO3 ». Journal of Magnetism and Magnetic Materials 310, no 2 (mars 2007) : e240-e242. http://dx.doi.org/10.1016/j.jmmm.2006.10.1086.

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18

Johnson, R. D., T. A. W. Beale, Y. Joly, S. R. Bland, P. D. Hatton, C. Mazzoli, L. Bouchenoire, D. Prabhakaran et A. T. Boothroyd. « Observed and calculated energy spectra of Bragg-forbidden reflections in YVO3 ». Journal of Physics : Conference Series 200, no 1 (1 janvier 2010) : 012073. http://dx.doi.org/10.1088/1742-6596/200/1/012073.

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19

Sharma, Shivani, Pavitra N. Shanbhag, Fabio Orlandi, Pascal Manuel, Sean Langridge, Devashibhai Adroja, Milan K. Sanyal et Athinarayanan Sundaresan. « Symmetry Origin of the Dzyaloshinskii–Moriya Interaction and Magnetization Reversal in YVO3 ». Inorganic Chemistry 60, no 4 (25 janvier 2021) : 2195–202. http://dx.doi.org/10.1021/acs.inorgchem.0c02845.

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20

Venkatesh, G., V. Pralong, O. I. Lebedev, V. Caignaert, P. Bazin et B. Raveau. « Amorphous sodium vanadate Na1.5+yVO3, a promising matrix for reversible sodium intercalation ». Electrochemistry Communications 40 (mars 2014) : 100–102. http://dx.doi.org/10.1016/j.elecom.2013.11.004.

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21

Tsvetkov, A. A., F. P. Mena, Y. Ren, I. S. Elfimov, P. H. M. van Loosdrecht, D. van der Marel, A. A. Nugroho, A. A. Menovsky et G. A. Sawatzky. « Optical and magneto-optical study of orbital and spin ordering transitions in YVO3 ». Physica B : Condensed Matter 312-313 (mars 2002) : 783–84. http://dx.doi.org/10.1016/s0921-4526(01)01494-6.

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22

Parveen, Atahar, et N. K. Gaur. « Impact of lattice distortions on elastic and thermal behavior of La doped YVO3 ». Thermochimica Acta 566 (août 2013) : 203–10. http://dx.doi.org/10.1016/j.tca.2013.06.007.

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23

Otsuka, Yuichi, et Masatoshi Imada. « First-Principles Computation of YVO3 : Combining Path-Integral Renormalization Group with Density-Functional Approach ». Journal of the Physical Society of Japan 75, no 12 (15 décembre 2006) : 124707. http://dx.doi.org/10.1143/jpsj.75.124707.

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24

Miyasaka, Shigeki, Yoichi Okimoto et Yoshinori Tokura. « Anisotropy of Mott–Hubbard Gap Transitions due to Spin and Orbital Ordering in LaVO3and YVO3 ». Journal of the Physical Society of Japan 71, no 9 (15 septembre 2002) : 2086–89. http://dx.doi.org/10.1143/jpsj.71.2086.

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25

Herrera, G., E. Chavira, J. Jimenez-Mier, L. Baños, J. Guzmán et C. Flores. « Synthesis and structural characterization of YVO3 prepared by sol–gel acrylamide polymerization and solid state reaction methods ». Journal of Sol-Gel Science and Technology 46, no 1 (4 mars 2008) : 1–10. http://dx.doi.org/10.1007/s10971-008-1703-6.

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26

Carpenter, Michael A., et Christopher J. Howard. « Symmetry rules and strain/order-parameter relationships for coupling between octahedral tilting and cooperative Jahn–Teller transitions in ABX 3 perovskites. II. Application ». Acta Crystallographica Section B Structural Science 65, no 2 (16 mars 2009) : 147–59. http://dx.doi.org/10.1107/s0108768109000962.

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The structural evolution of selected perovskites containing Jahn–Teller cations has been investigated in the light of a formal analysis of symmetry hierarchies for phase transitions driven by octahedral tilting and Jahn–Teller cooperative distortions. General expressions derived from the strain/order-parameter coupling relationships allowed by symmetry are combined with observed changes in lattice parameters to reveal details of order-parameter evolution and coupling. LuVO3, YbVO3, YVO3 and CeVO3 are representative of systems which develop Jahn–Teller ordering schemes associated with irreducible representations M^+_2 and R^+_3 of the space group Pm\bar 3m. Tilting of their octahedra is associated with M^+_3 and R^+_4. The Pnma (M^+_3+R^+_4 tilting) ↔ P21/a (M^+_3+R^+_4 tilting, R^+_3 Jahn–Teller order) transition below room temperature is close to second order in character. Shear strains which depend primarily on tilt angles show little variation, implying that there is only weak coupling between the tilting and Jahn–Teller order parameters. The subsequent P21/a ↔ Pnma (M^+_3+R^+_4 tilting, M^+_2 Jahn–Teller order) is first order in character, and involves either a reduction in the R^+_4 tilt angle or a change in the strength of tilt/Jahn–Teller order-parameter coupling. In LaMnO3, the isosymmetric Pnma (M^+_3+R^+_4 tilting) ↔ Pnma (M^+_3+R^+_4 tilting, M^+_2 Jahn–Teller order) transition can be described in terms of a classical first-order transition conforming to a 246 Landau expansion with negative fourth-order coefficients. Strain evolution in Ba-doped samples suggests that the transition becomes second order in character and reveals a new strain relaxation mechanism in LaMnO3 which might be understood in terms of local strain heterogeneities due to the disordering of distorted MnO6 octahedra. Transitions in PrAlO3 and La0.5Ba0.5CoO3 illustrate the transformation behaviour of systems in which the Jahn–Teller ordering scheme is associated with the irreducible representation \Gamma^+_3. Overall, coupled tilting + Jahn–Teller phase transitions in perovskites conform to mean-field behaviour, consistent with the underlying role of strain in promoting long interaction lengths.
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27

Jiang, Yi, et Su Wen Li. « Fabrication and Luminescent Properties of YVO4 : Eu3+/MCM-41 Mesoporous Composites ». Applied Mechanics and Materials 707 (décembre 2014) : 102–5. http://dx.doi.org/10.4028/www.scientific.net/amm.707.102.

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The optical functionalized YVO4: Eu3+/MCM-41 mesoporous composites were prepared by hydrothermal method. The structure, morphology, luminescence properties and fluorescence dynamics were studied systemically. The compared studies of the luminescence properties of YVO4: Eu3+/MCM-41 with YVO4: Eu3+ nanocrystal were performed. The results show that the YVO4: Eu3+/MCM-41 retains high ordered mesoporous structure of MCM-41. In YVO4: Eu3+/MCM-41, the intrinsic excitation bands of Eu3+ disappears and the lifetimes of Eu3+ become short. The luminescent efficiency of YVO4: Eu3+/MCM-41 is higher than ones of the YVO4: Eu3+ nanocrystal.
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Nguyen, Vu, Thoi Nguyen Thi, Roan Pham Duc, Hung Nguyen Manh, Giang Lam Thi Kieu et Tien Dinh Manh. « Synthesis and properties of YVO4:Ho and YVO4:Ho,Bi luminescent nanomaterials by combustion method ». Vietnam Journal of Catalysis and Adsorption 10, no 1S (15 octobre 2021) : 401–4. http://dx.doi.org/10.51316/jca.2021.127.

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YVO4:Ho and YVO4:Ho,Bi nanophosphors were synthesized via combustion synthesis using urea as fuel and metal nitrates as precursor. Structures, morphologies and optical properties of YVO4:Ho and YVO4:Ho,Bi nanophosphors annealed at 900 °C were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescent (PL) and photoluminescent excitation (PLE) spectra. The clearly YVO4 tetragonal phase was obtained. The average diameters for the phosphor particles are 20-30 nm. The nanophosphors could be excited by 320 nm which correspond to the VO4 absorption and then PL spectra of YVO4:Ho and YVO4:Ho,Bi nanophosphors are described by the 5F8, 5S2 – 5I8, 5F5 – 5I8 và 5F4, 5S2 → 5I7 transitions of Ho3+ ions at 543, 655 and 755 nm. The effects of Ho3+ and Bi3+ concentrations on structure and optical properties have been investigated
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29

Wang, En Guo. « Microwave-Assisted Hydrothermal Preparation of YVO4:Eu3+ Phosphor ». Materials Science Forum 663-665 (novembre 2010) : 417–20. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.417.

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YVO4:Eu3+ phosphors were prepared by microwave hydrothermal method in this work. YVO4:Eu3+ phosphors were probed by photoluminescence (PL), X-ray powder diffraction (XRD) and scanning electron microscope (SEM). The effects of different preparation conditions on the photoluminescence, the structure and the morphology of YVO4:Eu3+ phosphors were studied. The experiment results show that the pH value and the Eu3+ doping amount have some important effect on the photoluminescence and the morphology of YVO4:Eu3+phosphors.
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Yu, Hongquan, Hongwei Song, Guohui Pan, Reifei Qin, Libo Fan, Hui Zhang, Xue Bai, Suwen Li, Haifeng Zhao et Shaozhe Lu. « Preparation and Luminescent Properties of YVO4:Eu3+ Nanofibers by Electrospinning ». Journal of Nanoscience and Nanotechnology 8, no 3 (1 mars 2008) : 1432–36. http://dx.doi.org/10.1166/jnn.2008.361.

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This paper describes a procedure based on electrospinning for generating europium-doped yttrium vanadate (YVO4:Eu3+) nanofibers with diameters ranging from 30 to 50 nm. The YVO4:Eu3+ nanofibers were obtained through calcining precursory nanofibers, which were prepared through the electrospinning method. Suitable electrospinning parameters, such as concentration of PVP in solution, spinneret tip-to-collector plate distance (TCD), and applied voltage between spinneret and collector plate, are used to obtain thinner and more uniform precursory nanofibers of YVO4:Eu3+, which is important for preparing smaller diameter pure YVO4:Eu3+ nanofibers. The luminescent properties of the YVO4:Eu3+ nanofibers including excitation and emission spectra and fluorescence lifetime were studied. The excitation spectrum shows a broad band extending from 200 to 350 nm, which corresponds to the strong vanadate absorption in YVO4:Eu3+. The emission spectrum is dominated by the red 5D0 → 7F2 hypersensitive transition of Eu3+. The fluorescence lifetime of Eu3+ 5D0 → 7F2 (619 nm) is determined to be 493 μs at room temperature, which is basically in accordance with that in the bulk (521 μs).
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Wang, Shuai, Pengfei Wang, Yongfeng Ruan, Youfa Wang et Shouchao Zhang. « Photoluminescence characteristics and energy transfer phenomena in Ce3+-doped YVO4 single crystal ». Science and Engineering of Composite Materials 28, no 1 (1 janvier 2021) : 205–14. http://dx.doi.org/10.1515/secm-2021-0019.

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Abstract The undoped YVO4 and Ce3+-doped YVO4 single crystals have been successfully grown by the Czochralski method in a medium frequency induction furnace. The X-ray diffraction patterns testified that all samples exhibited the pure tetragonal YVO4 crystalline phase without any parasitic phases. The optical properties of Ce3+-doped YVO4 single crystals with different doping concentrations were investigated via a combination of absorption, emission, and excitation spectra. Dependence of luminescence and absorption intensity on Ce3+ doping concentration was discussed at different excitation wavelengths. The typical transitions of Ce3+ ions and the unusual intrinsic luminescent phenomena of VO 4 3 − {\text{VO}}_{4}^{3-} groups were observed and investigated in Ce3+-doped YVO4 crystals. More attentions were paid to ascertaining the corresponding transition states, analyzing luminescent mechanism, and revealing the energy transfer from VO 4 3 − {\text{VO}}_{4}^{3-} to Ce3+ ions. In addition, the CIE chromaticity coordinates and correlated color temperature were calculated on a basis of emission spectra under different excitation wavelengths.
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Kong, Deyan, Zhenling Wang, Cuikun Lin, Piaoping Yang, Zewei Quan et Jun Lin. « One-Step Synthesis and Luminescent Properties of Nanocrystalline YVO4:Eu3+ Powders ». Journal of Nanoscience and Nanotechnology 8, no 3 (1 mars 2008) : 1228–33. http://dx.doi.org/10.1166/jnn.2008.372.

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In this paper, nanocrystalline YVO4:Eu3+ powders have been successfully synthesized via high-temperature solution-phase synthesis process. The nanocrystalline YVO4:Eu3+ particles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV/Vis absorption spectra and luminescence spectra, luminescence decay curve and Fourier transform infrared (FT-IR), X-ray photoelectron spectra (XPS) respectively. The as-prepared nanocrystalline YVO4:Eu3+ particles are well crystallized with ellipsoidal morphology. The emission of YVO4:Eu3+ particles show emission originating from the 5D0 level, with 5D0–7F2 at 616 nm as the most prominent group. The excitation spectrumfits basically with the absorption spectrumfromthe vanadate ions. FT-IR and XPS spectra indicate that the surface ligands of nanocrystalline particles were oleic acid and oleylamine. The lifetime for the luminescence of Eu3+ in the as-prepared YVO4:Eu3+ samples are shorter than that of the bulk material due to the absorption of organic ligands on the nanoparticle surface.
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Huong, Tran Thu, Le Thi Vinh, Hoang Thi Khuyen, Le Dac Tuyen, Nguyen Duc Van, Do Thi Thao et Ha Thi Phuong. « Synthesis and In Vitro Testing of YVO4:Eu3+@silica-NH-GDA-IgG Bio-Nano Complexes for Labelling MCF-7 Breast Cancer Cells ». Molecules 28, no 1 (29 décembre 2022) : 280. http://dx.doi.org/10.3390/molecules28010280.

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We present a visual tool and facile method to detect MCF-7 breast cancer cells by using YVO4:Eu3+@silica-NH-GDA-IgG bio-nanocomplexes. To obtain these complexes, YVO4:Eu3+ nanoparticles with a uniform size of 10–25 nm have been prepared firstly by the hydrothermal process, followed by surface functionalization to be bio-compatible and conjugated with cancer cells. The YVO4:Eu3+@silica-NH-GDA-IgG nanoparticles exhibited an enhanced red emission at 618 nm under an excitation wavelength of 355 nm and were strongly coupled with MCF-7 breast cancer cells via biological conjugation. These bio-nanocomplexes showed a superior sensitiveness for MCF-7 cancer cell labelling with a detection percentage as high as 82%, while no HEK-293A healthy cells were probed under the same conditions of in vitro experiments. In addition, the detection percentage of MCF-7 breast cancer cells increased significantly via the functionalization and conjugation of YVO4:Eu3+ nanoparticles. The experimental results demonstrated that the YVO4:Eu3+@silica-NH-GDA-IgG bio-nanocomplexes can be used as a promising labelling agent for biomedical imaging and diagnostics.
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Pavitra, Eluri, Hoomin Lee, Seung Kyu Hwang, Jin Young Park, Young-Kyu Han, Ganji Seeta Rama Raju et Yun Suk Huh. « Evolution of Highly Biocompatible and Thermally Stable YVO4:Er3+/Yb3+ Upconversion Mesoporous Hollow Nanospheriods as Drug Carriers for Therapeutic Applications ». Nanomaterials 12, no 15 (22 juillet 2022) : 2520. http://dx.doi.org/10.3390/nano12152520.

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In recent times, upconversion nanomaterials with mesoporous hollow structures have gained significant interest as a prospective nano-platform for cancer imaging and therapeutic applications. In this study, we report a highly biocompatible YVO4:1Er3+/10Yb3+ upconversion mesoporous hollow nanospheriods (YVO4:Er3+/Yb3+ UC-MHNSPs) by a facile and rapid self-sacrificing template method. The Rietveld analysis confirmed their pure phase of tetragonal zircon structure. Nitrogen adsorption–desorption isotherms revealed the mesoporous nature of these UC-MHNSPs and the surface area is found to be ~87.46 m2/g. Under near-infrared excitation (980 nm), YVO4:Er3+/Yb3+ UC-MHNSPs showed interesting color tunability from red to green emission. Initially (at 0.4 W), energy back transfer from Er3+ to Yb3+ ions leads to the strong red emission. Whereas at high pump powers (1 W), a fine green emission is observed due to the dominant three-photon excitation process and traditional energy transfer route from Er3+ to Yb3+ ions. The bright red light from the membrane of HeLa cells confirmed the effective cellular uptake of YVO4:Er3+/Yb3+ UC-MHNSPs. The resonant decrease in cell viability on increasing the concentration of curcumin conjugated YVO4:Er3+/Yb3+ UC-MHNSPs established their excellent antitumor activity. Therefore, the acquired results indicate that these YVO4:Er3+/Yb3+ UC-MHNSPs are promising drug carriers for bioimaging and various therapeutic applications.
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Mlynczak, Jaroslaw, et Maciej Zyskowski. « Investigation of the Impact of the Pumping Beam Waist Size and Position on the Efficiency of YVO4/Nd : YVO4/YVO4 Laser Generation ». International Journal of Optics 2021 (16 juillet 2021) : 1–5. http://dx.doi.org/10.1155/2021/5451467.

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This article presents the results of the investigation of the generation efficiency for different sizes and positions of the pumping beam waist inside the active medium of the YVO4/Nd : YVO4/YVO4 lasers. The measurements were carried out for a fixed resonator length of 36.1 mm, a constant pumping power of 1.16 W, and four output couplers with different radii of curvature. According to the knowledge of the authors, such an extended experimental approach is presented for the first time.
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Liang, Zhen Hua, Feng Qi Lu, Hai Long Zhang et Gui Hua Peng. « Preparation of YVO4:Eu3+,Ln (Ln = Bi3+, La3+, Li+) Red Phosphors by Combustion Synthesis and their Luminescence Properties ». Materials Science Forum 663-665 (novembre 2010) : 162–65. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.162.

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YVO4:Eu3+,Ln (Ln = Bi3+, La3+, Li+) red phosphors were prepared by combustion synthesis, and effect of the Bi3+, La3+, Li+ doping ions on luminescence properties was studied. After doping with Bi3+, the emission intensity, excited by 322nm UV, decreased, but the absorption at 365nm was effectively enhanced; the brightness was increased by doping with La3+ or Li+, and the emission intensity at 619nm for YVO4:0.05Eu3+,0.15 Li+, excitation at 322nm, was about 160% of that for YVO4:0.05Eu3+.
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Chen, Taihui, He Zhang, Zhihong Luo, Jun Liang et Xiaoli Wu. « Facile Preparation of YVO4 : RE Films and the Investigation of Photoluminescence ». Coatings 12, no 4 (29 mars 2022) : 461. http://dx.doi.org/10.3390/coatings12040461.

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Facile preparation of YVO4 films was hydrothermally achieved within 1 h by using layered yttrium hydroxide (Y2(OH)5NO3·nH2O) films as the sacrificial precursor in the presence of excess NaVO3 at pH~8, without subsequent heat treatment. Detailed structures and optical properties of the products were obtained by using a combination of XRD, FT-IR, FE-SEM, HR-TEM, and PLE/PL techniques. The phase and morphological evolution from Y2(OH)5NO3·nH2O to YVO4 was unveiled by varying the reaction time. Photoluminescence spectra showed that the Eu3+ doped YVO4 films exhibited the characteristic emission of Eu3+, with the transition 5D0–7F2 (614 nm, red) being the dominant; while Dy3+ activator doped YVO4 films exhibited the characteristic emission of Dy3+, with the transition 4F9/2–6H13/2 (575 nm, green) being the most dominant.
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Xie, Baogeng, Min Chen, Junyue Lin, Xiaobing Liu, Shujun Peng et Luping Zhong. « Simple Methods to Synthesize YVO4 Nanocrystals or Microcrystals without Any Templates or Surfactants ». Journal of Chemistry 2020 (11 mai 2020) : 1–7. http://dx.doi.org/10.1155/2020/3878409.

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YVO4 crystals with different sizes and shapes were produced through hydrothermal treatment and sonication method without any surfactants or templates. X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and photoluminescence (PL) were used to characterize the obtained products. YVO4 nanocrystals with spindle-like shape had been produced through the two different treating methods. YVO4 crystals, which are bipyramid-capped and micrometer-sized, had been obtained through a simple hydrothermal treatment. Uniform microsized cuboids had been produced through hydrothermal treatment with the final pH value = 2.5. The effects of different final pH values on the shape and crystallinity of products were studied. To determine photoluminescence performances, Eu3+(5%)-doped YVO4 nanocrystals had been synthesized through different methods in various environments and it had been confirmed that crystallinity would affect photoluminescence intensity.
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Ye, Yan Lin, et Pei Song Tang. « Synthesis of Nanocrytalline YVO4 by Microwave Assisted Process and its Photocatalytic Activity ». Applied Mechanics and Materials 178-181 (mai 2012) : 531–34. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.531.

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The YVO4 was synthesized by microwave assisted process. The products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis diffuse reflectance spectroscopy (DRS), thermogravimetry and differential thermal analysis (TG-DTA) and Brunauer-Emmett-Teller (BET) method. The results show that YVO4 was tetragonal crystal, particle size of 50 to 80 nm, band gap of 3.3 eV and surface area of 18.6m2/g. The photocatalytic experiment of YVO4 shows the high photocatalytic activity for the decomposition of methyl orange under UV-light irradiation.
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Trinh, Chinh Dung, Thuan Van Doan, Phuong Hau Thi Pham, Dung My Thi Dang, Pham Van Quan et Chien Mau Dang. « Synthesis and Research of Rare Earth Nanocrystal Luminescent Properties for Security Labels Using the Electrohydrodynamic Printing Technique ». Processes 8, no 2 (24 février 2020) : 253. http://dx.doi.org/10.3390/pr8020253.

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YVO4:Eu3+ nanoparticles were successfully synthesized by two methods, namely the sonochemical method and hydrothermal method. The X-ray diffraction (XRD) patterns showed the tetragonal phase of YVO4 (JCPDS 17-0341) was indexed in the diffraction peaks of all samples. The samples synthesized by the sonochemical method had a highly crystalline structure (X-ray diffraction results) and luminescence intensity (photoluminescence results) than those synthesized by the hydrothermal method. According to the results of field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM), the average size of YVO4:Eu3+ nanoparticles was around 25–30 nm for the sonochemical method and 15–20 nm for the hydrothermal method. YVO4:Eu3+ nanoparticles in the case of the sonochemical method had a better crystalline structure and stronger emissivity at 618 nm. The Eu3+ ions’ average lifetime in YVO4:Eu3+ at 618 nm emission under 275 nm excitation were at 0.955 ms for the sonochemical method and 0.723 ms for the hydrothermal method. The security ink for inkjet devices contained YVO4:Eu3+ nanoparticles, the binding agent as polyethylene oxide or ethyl cellulose and other necessary solvents. The device used for security label printing was an inkjet printer with an electrohydrodynamic printing technique (EHD). In the 3D optical profilometer results, the width of the printed line was ~97–167 µm and the thickness at ~9.1–9.6 µm. The printed security label obtained a well-marked shape, with a size at 1.98 × 1.98 mm.
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41

Lepore, Valentina. « Claude Yvon apologeta nell’Encyclopédie. La mortalità dell’anima e i ritratti di Andrea Cesalpino e Cesare Cremonini in Aristotélisme ». Diciottesimo Secolo 7 (18 novembre 2022) : 137–45. http://dx.doi.org/10.36253/ds-13364.

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The paper shows the apologetic intent of Claude Yvon (1714-1789) in his contribution to the Encyclopédie of Diderot and d’Alembert (1751-1772). The article focuses on his Aristotélisme, which allows us to solve the mid-18th-century debate on whether Yvon was heterodox or orthodox. In particular, the examination concerns what Yvon expressed about the Aristotelian theory of the mortality of the soul, paying attention to the sections on the Italian Aristotelians of the Renaissance and of the modern age Andrea Cesalpino (1524 or 1525-1603) and Cesare Cremonini (1550-1631).
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Laval, G. « Jacques Yvon ». European Physical Journal Special Topics 224, no 5 (juillet 2015) : 765–67. http://dx.doi.org/10.1140/epjst/e2015-02425-8.

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43

Huang, Chien-Yen, Bo-Cheng Guo, Zi-Xuan Zheng, Chia-Han Tsou, Hsing-Chih Liang et Yung-Fu Chen. « Continuous-Wave Crystalline Laser at 714 nm via Stimulated Raman Scattering and Sum Frequency Generation ». Crystals 12, no 8 (28 juillet 2022) : 1046. http://dx.doi.org/10.3390/cryst12081046.

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A compact high-power continuous-wave (CW) laser at 714 nm is originally developed via intracavity stimulated Raman scattering (SRS) and sum frequency generation (SFG). The fundamental wave at 1342 nm and the first-Stokes Raman wave at 1525 nm are generated by using a Nd:YVO4 and a undoped YVO4 crystals, respectively. Compared to the self-Raman laser, the separation of the gain media for generating the fundamental and Raman waves can effectively reduce the thermal lens effect in the Nd:YVO4 crystal and efficiently enhance the SRS in the undoped YVO4 crystal. Furthermore, the undoped YVO4 crystal is coated to act as a high-reflection mirror for minimizing the cavity losses. At a pump power of 40 W, the output power at 714 nm can reach 1.8 W. The present compact design for CW laser source at 714 nm is believed to be practically useful for laser cooling and trapping of radium.
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Zeng, Hui-Hui, Zhi-Ying Zhou, Fang Liu, Jie Deng, Shu-Yun Huang, Guo-Ping Li, Pei-Qing Lai, Yue-Ping Xie et Wei Xiao. « Design and synthesis of a vanadate-based ratiometric fluorescent probe for sequential recognition of Cu2+ ions and biothiols ». Analyst 144, no 24 (2019) : 7368–77. http://dx.doi.org/10.1039/c9an01518c.

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YVO4:Eu3+@CDs core–shell nanomaterial was synthesized through a simple self-assembly of carbon dots (CDs) with YVO4:Eu3+, since the high affinity of oxygen-containing groups such as –COOH or –OH of CDs to the metal ions on the surface of YVO4:Eu3+.
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Xu, Hai Yan, Ling Xu, Shi Biao Wu, Xu Dong Wang et Hao Wang. « Synthesis of YVO4 Nanoparticles with Controllable Morphologies by Solvothermal Method ». Advanced Materials Research 239-242 (mai 2011) : 356–59. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.356.

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YVO4 nanoparticles with various morphologies were tuned directly by hydrothermal treatment in different solutions, including pure water, potassium hydroxide solution, hydrazine hydrate, ethanolamine, triethylamine, and pyridine. X-ray diffraction (XRD), Raman, and transmission electron microscopy (TEM) were utilized to characterize the structure, morphology, and size of the products, which indicated that tetragonal phase YVO4 crystallites displaying rod-like, square, and olivary shapes were obtained. It was found that the selected solvents play an important role in modulating the morphology and confining the size of the obtained products.
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Liang, Yu Jun, Rong Liu, Wen Shuai Yan et Xiao Yong Wu. « Molten Salt Synthesis and Photoluminescence of YVO4:Eu Microcrystalline Phosphors ». Advanced Materials Research 66 (avril 2009) : 65–68. http://dx.doi.org/10.4028/www.scientific.net/amr.66.65.

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Tetragonal phase of YVO4:Eu3+ powders have been successfully synthesized via a molten salt synthesis process. During the process, rare earth nitrates and ammonium vanadate were used as precursors, the mixture of KCl and NaCl as a molten salt. As shown in XRD and SEM, the resultant product was a pure phase of YVO4 without any other impurities. Under the excitation of 326 nm, all the materials show the characteristic emission of Eu3+ which is the strong red emission originating from the 5D0 level, with 5D0→7F2 at 619 nm as the most prominent group.
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Wang, Ju An, Yun Hua Xu, Qihong Cen, Xiao Man Zhang et Ya Ru Cui. « Synthesis and Luminescent Properties of Porous YVO4:Sm Nanoplates ». Materials Science Forum 620-622 (avril 2009) : 541–44. http://dx.doi.org/10.4028/www.scientific.net/msf.620-622.541.

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The present research describes a simple low-temperature synthesis route of fabricating porous YVO4:Sm nanoplates via a chemical co-precipitation method using commercially available Y2O3, NH4VO3, Sm2O3 and ethylene glycol as the reacting precursors. The as-synthesized YVO4:Sm was thermally treated at 300°C and 600°C for 2 h which is much lower than that of the conventional preparation methods. The obtained samples were characterized by FTIR, XRD, TEM and PL. The photoluminescence measurement revealed that the luminescence intensity was significantly increased with increasing annealing temperature.
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Wu, Mihye, Hyemin Park, Eun Gyu Lee, Sanghun Lee, Yu Jin Hong et Sungho Choi. « Luminescence Quenching Behavior of Hydrothermally Grown YVO4:Eu3+ Nanophosphor Excited under Low Temperature and Vacuum Ultra Violet Discharge ». Materials 13, no 15 (23 juillet 2020) : 3270. http://dx.doi.org/10.3390/ma13153270.

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The luminescence quenching behavior and energy transfer process in hydrothermally grown Eu3+-doped YVO4 nanophosphors were studied using low temperature photoluminescence spectroscopy. The luminescence efficiency of nanophosphor is dependent on the acidity of its solution media and the post annealing condition after hydrothermal processing. The overall results suggest that the abnormal luminescence behavior of Eu3+-doped nanocrystalline YVO4 under low temperature photoexcitation is due to the incorporated non-radiative hydroxyl groups often encountered in hydrothermal synthesis as well as to the inefficient energy transfer to luminescent ions from vanadate groups.
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Li, Yan Hong, Guo Feng Zang et Jing Ma. « Synthesis and Luminescence Properties of YVO4:Eu 3+ Nanocrystals by a Sol-Gel Method ». Advanced Materials Research 634-638 (janvier 2013) : 2268–71. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.2268.

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YVO4:Eu3+ nanocrystals were synthesized using a sol-gel method which citric acid was used as complexing agent and ethylene glycol was used as coupler. In order to study the influence of heat treating temperature and time on structure and luminescence properties of YVO4:Eu3 nanocrystals, the dry gels were heated at 400 oC, 500 oC and 600 oC for 1 h, 600 o C for 3 h, respectively. X-ray diffraction, SEM and luminescence spectra were used to characterize the structure and luminescence properties. The results of XRD indicate that YVO4:Eu3+ nanocrystals with tetragonal zircon were obtained. The average crystallite sizes of the samples increase with the increasing heat treating temperatures. The results of excitation and emission spectra show that the broad excitation band is assigned to charge transfer band of Eu-O and V-O, the emissions peaks are from 5D0-7FJ transitions. The emission intensities increase with increasing heat treating temperature and time. The local environments of Eu3+ ions in the samples prepared at different conditions are discussed.
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Zhao, Shuang, Baiqi Shao, Yang Feng, Senwen Yuan, Langping Dong, Liang Zhang et Hongpeng You. « A novel synthesis of YVO4:Ln3+ (Ln = Eu, Sm, and Dy) porous/hollow submicro-ellipsoids and their luminescence properties ». CrystEngComm 22, no 19 (2020) : 3340–46. http://dx.doi.org/10.1039/d0ce00526f.

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