Optical properties of undoped NdTaO 4 , ErTaO 4 and YbTaO 4 ceramics

Siqueira, Kisla Prislen Félix; Carmo, A.P.; Bell, M.J.V.; Dias, Anderson

doi:10.1016/j.jlumin.2016.06.054

Cited by 27 publications

(12 citation statements)

References 31 publications

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“…Commonly, chemical forms of the rare-earth tantalates and niobates are written as REBO 4 , RE 3 BO 7 , REB 3 O 9 , REB 5 O 14 , and REB 7 O 19 , where RE means rare earth ions, and B are Ta or Nb elements [5,6]. Orthotantalates and orthoniobates REBO 4 belong to the fergusonite structure and have been reported extensively [7][8][9]. By comparison and analysis, REBO 4 exhibited excellent luminescent properties [10].…”

Section: Introductionmentioning

confidence: 99%

Rare-Earth Tantalates and Niobates Single Crystals: Promising Scintillators and Laser Materials

et al. 2018

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Rare-earth tantalates, with high density and monoclinic structure, and niobates with monoclinic structure have been paid great attention as potential optical materials. In the last decade, we focused on the crystal growth technology of rare-earth tantalates and niobates and studied their luminescence and physical properties. A series of rare-earth tantalates and niobates crystals have been grown by the Czochralski method successfully. In this work, we summarize the research results on the crystal growth, scintillation, and laser properties of them, including the absorption and emission spectra, spectral parameters, energy levels structure, and so on. Most of the tantalates and niobates exhibit excellent luminescent properties, rich physical properties, and good chemical stability, indicating that they are potential outstanding scintillators and laser materials.

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Section: Introductionmentioning

confidence: 99%

Rare-Earth Tantalates and Niobates Single Crystals: Promising Scintillators and Laser Materials

et al. 2018

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“…4 I 13/2 (1300-1425 nm). [2] PL emission spectra for Nddoped glass ceramics (λ ex = 470 nm) emitted at 900 nm could be attributed to 4 F 3/2 ! 4 I 9/2 and results from the emission of Nd 3+…”

Section: Morphological Characteristics Of Filmsmentioning

confidence: 95%

“…4 G 5/2 transition was observed to be the most NTO ceramics. [2] The small wide absorption peaks at 258 (240) and 300 nm (CTB), corresponded to the O 2À !Nb 5+ (Ta 5+ ) transition and were shared from electron transfer from the oxygen 2p orbital to an empty 4f orbital in Nd. [21] The CTB band at 332 nm belonged to the PZ/Al 2 O 3 substrates.…”

Section: Morphological Characteristics Of Filmsmentioning

confidence: 99%

Luminescence properties of neodymium, samarium, and europium niobate and tantalate thin films

et al. 2022

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Thin films of lanthanide orthoniobate LnNbO4 (LnNO) and orthotantalate LnTaO4 (LnTO), (Ln = Nd, Sm, Eu) were fabricated using the sol–gel method with subsequent spin‐coating on the PbZrO3/Al2O3 substrate and annealing at 1000°C. X‐ray diffraction patterns showed monoclinic M‐LnNbO4 or M´‐LnTaO4, which coexists with the orthorhombic or tetragonal phase. X‐ray photoelectron spectroscopy demonstrated the presence of Nd3+, Sm3+/Sm2+ and Eu3+/Eu2+ ions. The luminescence properties of polymorphic films were investigated. Excitation spectra of PbZrO3 interlayer represented broad bands at 410 and 550 nm that were assigned to charge transfer bands (CTB). In all films, the CTB broad band at ~275 nm related to charge transfer transition of Ln3+→O2− and NbO43− or TaO43− groups. In excitation spectra, 4I9/2→4G5/2 (Nd3+), 6H5/2→6P3/2 (Sm3+) and 7F0→5L6 (Eu3+) transitions (at 585, 402 and 395 nm), respectively were found to be more intense than any other Ln3+ transition. The emission spectra showed narrow and intense bands at 1065, 600, and 614 nm that were ascribed to Nd3+, Sm3+, and Eu3+ 4f–f intraconfigurational transitions 4F3/2→4I11/2, 4G5/2→6H7/2, and 5D0→7F2, respectively. The excellent luminescence properties of films make them new potential groups for visible and/or near‐infrared applications such as sensors and imaging equipment.

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“…Among the wide range of properties of rare‐earth tantalates that determine the prospects for practical application of materials based on them, for example, as ion conductors, 1,2 photocatalysts, 3,4 luminophores, 5,6 scintillators, 7 solid‐state lighting devices, 8 etc, it is necessary to note their high density (8‐9.5 g/cm 3 ), high melting temperatures of ~2073 K, 9,10 and chemical resistance 11 . Recently, there has been great interest in rare‐earth (RE) tantalates for their use as thermal barrier coatings (TBC), 12‐14 or their components 15,16 .…”

Section: Introductionmentioning

confidence: 99%

Thermal expansion and heat capacities of holmium and erbium orthotantalates ceramics

Гагарин

Guskov

et al. 2020

J. Am. Ceram. Soc.

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Monoclinic M-orthotantalates of holmium and erbium ceramics were obtained by co-precipitation and annealing at 1773 K and characterized by X-ray powder diffraction, scanning electron microscopy, and chemical analysis. Using the high-temperature X-ray diffraction method, the temperature dependence of the monoclinic lattice parameters of both ceramics were determined at range 298-1273 K. The molar heat capacity of M-HoTaO 4 and M-ErTaO 4 were measured by adiabatic (7-350 K) and differential scanning (320-1350 K) calorimetry. Standard thermodynamic function (entropy, enthalpy change, and reduced Gibbs energy) were calculated on the smoothed values of molar capacity, without taking into account contribution of low-temperature interval: 0-7 K for M-HoTaO 4 and 0-8 K for M-ErTaO 4. The general shape of the anomalous Schottky contribution to the molar heat capacity was determined.

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Optical properties of undoped NdTaO 4 , ErTaO 4 and YbTaO 4 ceramics

Cited by 27 publications

References 31 publications

Rare-Earth Tantalates and Niobates Single Crystals: Promising Scintillators and Laser Materials

Rare-Earth Tantalates and Niobates Single Crystals: Promising Scintillators and Laser Materials

Luminescence properties of neodymium, samarium, and europium niobate and tantalate thin films

Thermal expansion and heat capacities of holmium and erbium orthotantalates ceramics

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