Optical and structural properties of Ni2+-doped magnesium gallate polycrystalline samples

Costa, G.; Sosman, L.P.; López, A.; Cella, N.; Barthem, R.B.

doi:10.1016/j.jallcom.2012.04.039

Cited by 20 publications

(11 citation statements)

References 31 publications

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“…Therefore, transition metal ions, as the candidate dopants to realize a broadband NIR luminescence, have attracted considerable attention. 26 As suggested in the previous studies, 5,27 the Ni 2+ ion gives a broadband NIR emission with a center around 1400 nm when occupying an octahedral site in various materials, which is attributed to both its 3d 8 electronic configuration and strong influence on the splitting of the energy level caused by the electrostatic potential, owing to the contribution of neighborhood ions. Interestingly, some research studies on glass-ceramics have reported that Ga 3+ ions possess both tetrahedral and octahedral coordination but prefer choosing the octahedral one in the b phase host lattice, 28 the Ni 2+ ions preferentially replace the Ga 3+ ions located at octahedral sites in the b phase host lattice.…”

Section: Introductionmentioning

confidence: 63%

“…Meanwhile, the β-Ga 2 O 3 has also been investigated as a excellent host material, for example, the Dy 3+ -doped β-Ga 2 O 3 phosphor has been successfully synthesized by Li et.al, showing a potential application in the photoluminescence areas and field emission display devices [25] . Therefore, transition metal ions, as the candidate dopants for realize a broadband NIR luminescence, have attracted considerable attention [26] . Therefore, transition metal ions, as the candidate dopants for realize a broadband NIR luminescence, have attracted considerable attention [26] .…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous broadband near-infrared emission and magnetic properties of single phase Ni²⁺-doped β-Ga₂O₃ nanocrystals via mediated phase-controlled synthesis

Zhang

et al. 2015

J. Mater. Chem. C

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Monodisperse rice-like Ni 2+ -doped β-Ga 2 O 3 nanostructures were phase-controllably synthesized via hydrothermal route and subsequent calcination. The detailed phase, composition and morphology were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and high resolution transmission electron microscopy (HRTEM), which showed the rice-like β-Ga 2 O 3 nanostructures were assembled with nanorods with a diameter of ~50 nm along their entire length. The phase formation and transition behavior of β-Ga 2 O 3 nanocrystals were investigated, and a possible crystal growth mechanism of rice-like GaOOH nanostructure was proposed.Photoluminescence (PL) spectra indicated that Ni 2+ -doped β-Ga 2 O 3 phosphors exhibit a broadband near-infrared emission (1200~1600 nm). Besides, the magnetic property was also investigated, revealing the Ni 2+ -doped β-Ga 2 O 3 nanocrystals a ferromagnetic nature. The single phase Ni 2+ -doped β-Ga 2 O 3 nanocrystals endowed with optical and magnetic bifunctional properties have promising potential application in the fields of optical communication, biological diagnosis and magnetic information storage, etc. Graphical AbstractBroadband near-infrared emission (1200~1600 nm) and ferromagnetic properties was detected from single phase Ni 2+ -doped β-Ga 2 O 3 nanocrystals via mediated phase-controlled synthesis. The realization of optical-magnetic bifunctional nanocrystals is meaningful for the application in high-accuracy communications, bio-labels, etc.

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Section: Introductionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Simultaneous broadband near-infrared emission and magnetic properties of single phase Ni²⁺-doped β-Ga₂O₃ nanocrystals via mediated phase-controlled synthesis

Zhang

et al. 2015

J. Mater. Chem. C

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“…Because of the same valence and similar crystal radii, it is expected that Ni 2+ ions occupy Zn 2+ octahedral or/and tetrahedral sites in Zn 2 TiO 4 . However, the green color of the Zn 2 TiO 4 :Ni 2+ sample indicates the occupation of Ni 2+ ions in octahedral sites 18,[33][34][35] .…”

Section: Resultsmentioning

confidence: 99%

Photoluminescence, Photoacoustic and Structural Characteristics of Polycrystalline Zn2TiO4: Ni2+ Semiconductor

et al. 2020

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This work presents the investigation, at room temperature, of Zn 2 TiO 4 samples containing Ni 2+ ions as substitutional impurities. Samples with molecular formula Zn 2(1-x) Ni 2x TiO 4 , where x = 0.00, 0.0007, 0.001, 0.0013, 0.002 and 0.003, in which Zn 2+ ions were replaced by Ni 2+ ions, were prepared through solid-state method, crystalline data were obtained by X-ray diffraction, the elemental composition was determined by X-ray fluorescence and the optical properties were investigated through photoluminescence and photoacoustic techniques. The photoluminescence spectra showed broadbands from 640 nm to 800 nm. The emission of the Zn 2(1-x) Ni 2x TiO 4 samples was assigned to the overlapping of the Ni 2+ and the Zn 2 TiO 4 emission. The most intense photoluminescence signal was obtained with excitation radiation at a wavelength of 360 nm for the sample with x = 0.001. The photoacoustic spectra showed absorption bands characteristic of semiconductor materials due to the host Zn 2 TiO 4 . The energy bandgap of the Zn 2(1-x) Ni 2x TiO 4 was obtained from photoacoustic absorption spectra.

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“…The unitary cell contains 32 oxygen atoms with 96 interstices (32 B 3+ octahedral sites and 64 tetrahedrally coordinated A 2+ sites) [3,4]. The MgGa 2 O 4 has a partially inverted spinel structure belonging to the space group Fd3m with cell parameter a= 8.2733 Å [4,5]. In the inverted spinel, the B 3+ cations occupy tetrahedral O objetivo deste trabalho foi investigar as propriedades magnéticas e a dependência da condutividade elétrica com a temperatura associada ao modelo de barreiras de potencial entre os cristalitos.…”

Section: Introductionunclassified

Magnetic properties and potential barrier between crystallites model of MgGa2-xFexO4 ceramics

et al. 2016

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The aim of this work was to investigate the magnetic properties and the electrical conductivity temperature dependence associated to the potential barrier between the crystallites model. Gallium and magnesium containing spinel ceramic has low magnetic coercivity and high electrical resistivity. MgGa2-xFexO4 samples (x= 0.01, 0.05, 0.15, 0.25, 0.35) were prepared by solid-state method and sintered at 800 °C for 8 h. X-ray diffraction analysis confirmed the formation of a single phase with compact cubic spinel structure. The magnetic measurements show that the saturation magnetization and remanence of all samples increased with increasing iron concentration. The coercive field decreased up to the concentration x= 0.15, and above x= 0.25 it was observed an increase in the coercive field. Through electrical characterization it was found that the samples presented highly insulating behavior for x= 0.01, and further increase in x above 0.15 gives a semiconductor behavior compatible with the potential barrier between the crystallites model, i.e. fulfills the condition L/2 > LD (crystallite size L in comparison with the Debye length LD), and the conduction is limited by potential barriers between the crystallites.

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Optical and structural properties of Ni2+-doped magnesium gallate polycrystalline samples

Cited by 20 publications

References 31 publications

Simultaneous broadband near-infrared emission and magnetic properties of single phase Ni²⁺-doped β-Ga₂O₃ nanocrystals via mediated phase-controlled synthesis

Simultaneous broadband near-infrared emission and magnetic properties of single phase Ni²⁺-doped β-Ga₂O₃ nanocrystals via mediated phase-controlled synthesis

Photoluminescence, Photoacoustic and Structural Characteristics of Polycrystalline Zn2TiO4: Ni2+ Semiconductor

Magnetic properties and potential barrier between crystallites model of MgGa2-xFexO4 ceramics

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Optical and structural properties of Ni2+-doped magnesium gallate polycrystalline samples

Cited by 20 publications

References 31 publications

Simultaneous broadband near-infrared emission and magnetic properties of single phase Ni2+-doped β-Ga2O3 nanocrystals via mediated phase-controlled synthesis

Simultaneous broadband near-infrared emission and magnetic properties of single phase Ni2+-doped β-Ga2O3 nanocrystals via mediated phase-controlled synthesis

Photoluminescence, Photoacoustic and Structural Characteristics of Polycrystalline Zn2TiO4: Ni2+ Semiconductor

Magnetic properties and potential barrier between crystallites model of MgGa2-xFexO4 ceramics

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Simultaneous broadband near-infrared emission and magnetic properties of single phase Ni²⁺-doped β-Ga₂O₃ nanocrystals via mediated phase-controlled synthesis

Simultaneous broadband near-infrared emission and magnetic properties of single phase Ni²⁺-doped β-Ga₂O₃ nanocrystals via mediated phase-controlled synthesis