On the Structural and Luminescent Properties of the  M  ′    LnTaO4 Rare Earth Tantalates

Brixner, L.H.; Chen, H. ‐y.

doi:10.1149/1.2119609

Cited by 184 publications

(95 citation statements)

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“…In both the tetragonal and monoclinic structures the trivalent rare-earth ions have an 8-fold coordination in a deformed polyhedron and the pentavalent ions, Nb and Ta, have tetrahedral coordination. [24] The Zr 4+ ion usually prefers 8-fold coordination as it does in cubic and tetragonal zirconia [25] but it can also adopts a 7-fold coordination as it does in monoclinic zirconia, [26] for instance. It is not reported to adopt a tetrahedral coordination so it is not obvious why zirconia exhibits such an extensive solubility in either the tetragonal or monoclinic phases that we have been studying.…”

Section: Discussionmentioning

confidence: 99%

The tetragonal–monoclinic, ferroelastic transformation in yttrium tantalate and effect of zirconia alloying

et al. 2014

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Oxide compositions of equimolar YO1.5 and TaO2.5 in the Y-Ta-Zr-O system have attractive properties for high temperature applications including as thermal barrier coatings. The effect of zirconia concentration, from 0 to 20 mole percent cation, on the tetragonal to monoclinic phase transition has been studied using high temperature X-ray diffraction, Raman spectroscopy, and electron microscopy. The transformation is reversible and the temperature variation of an order parameter based on the spontaneous strain is consistent with the transformation being ferroelastic, a critical feature for toughening at high temperatures. The presence of twin domains further supports this conclusion. Additionally, stabilization of the tetragonal phase with increasing ZrO2 is evident from the amount of partially retained tetragonal phase at room temperature.2

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Section: Discussionmentioning

confidence: 99%

The tetragonal–monoclinic, ferroelastic transformation in yttrium tantalate and effect of zirconia alloying

et al. 2014

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“…By comparison and analysis, REBO 4 exhibited excellent luminescent properties [10]. Moreover, RE ions can be substituted easily by other trivalent ions to realize characteristic fluorescence emission, from the ultraviolet to the infrared region [11]. With the change of RE ions radius, there are three different structures.…”

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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“…In the M′-YTaO 4 structure, tantalum atoms are in a distorted octahedral coordination with six Ta-O bonds, whereas in M-YTaO 4 tantalum atoms are in tetrahedral coordination. Furthermore, the unit cell volume of M′ phase is approximately half of that of M phase, and the average Ta-O distances are relatively smaller [15][16][17]. As a result, M′ phase offers more efficient charge transfer process that determines a more intense luminescent emission.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, M′ phase offers more efficient charge transfer process that determines a more intense luminescent emission. The unit cell parameters for M′-YTaO 4 are a = 5.29 Å, b = 5.45 Å, c = 5.11 Å, and β = 96.45°, and the density is 7.57 g/cm 3 [15].…”

Section: Introductionmentioning

confidence: 99%

Production, characterization, and luminescent properties of Eu3+ doped yttrium niobate–tantalate films

et al. 2017

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were produced by sol-gel method and grown on single crystalline Si (100) substrate by spin coating approach. Structural properties and thermal behaviours of the films were characterized by means of X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), and thermogravimetry and differential thermal analysis (TG-DTA). Systematic Steady-state photoluminescence and lifetime measurements in a series of yttrium niobium-tantalate with varying amounts of Eu 3+ were presented. The photoluminescence spectra of the films exhibited strong blue (380-400 nm) and red (614 nm) emissions upon ultraviolet excitation. Emission intensities were strongly dependent on the host lattice composition and film morphology. 1.5% Eu 3+ doped films exhibited the brightest luminescence and long lifetime extending to 1.22 ms when excited at 254 nm. To the best of our knowledge, this is the first attempt in the production of M′-YTO, M′-YTNO, and M′-YTNO:Eu 3+ films on single crystalline Si (100) substrate via sol-gel spin coating.

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On the Structural and Luminescent Properties of the M ′ LnTaO4 Rare Earth Tantalates

Cited by 184 publications

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The tetragonal–monoclinic, ferroelastic transformation in yttrium tantalate and effect of zirconia alloying

The tetragonal–monoclinic, ferroelastic transformation in yttrium tantalate and effect of zirconia alloying

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

Production, characterization, and luminescent properties of Eu3+ doped yttrium niobate–tantalate films

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