Yttrium tantalate containing high concentrations of Eu3+ as dopant: Synthesis and structural and luminescence features

Borges, Fernanda Hediger; Caixeta, Fábio José; Pereira, R.; Oliveira, Silvana Ruella de; Gonçalves, Rogéria Rocha

doi:10.1016/j.jlumin.2018.03.017

Cited by 26 publications

(27 citation statements)

References 62 publications

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“…The YTaO 4 compound located at equal molar‐composition site of Y 2 O 3 ‐Ta 2 O 5 binary phase diagram are also appealing as luminescent materials . Due to the ferroelastic transformation and low thermal conductivity; however, YTaO 4 shows great potentials in the application of structural materials especially for thermal barrier coatings .…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental investigations of mechanical properties for polymorphous YTaO₄ceramics

Zhou

et al. 2019

J Am Ceram Soc

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In this work, the dense bulk polymorphous YTaO4 ceramics with M or M' phase are synthesized by spark plasma sintering method accompanying with different tempering procedures. Combined with the nano‐indentation and theoretical calculation, their mechanical properties are systematically investigated. The identification of crystal structure reveals that the YTaO4 crystallizes into M phase (space group: I2/a) with higher tempering temperature, otherwise it crystallizes into M' phase (space group: P2/a). The results of mechanical properties indicate M‐phase YTaO4 possesses larger Young's modulus and hardness than that of M' phase. It is stemmed from the chemical bonding strength of M phase is stronger than that of M' phase, and the stronger bonding strength of M phase also results in its elastic resilience is superior to M' phase. Besides, on account of the low symmetry of monoclinic crystal system, the Young's modulus of polymorphous YTaO4 ceramics exhibit strong anisotropy.

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Section: Introductionmentioning

confidence: 99%

Theoretical and experimental investigations of mechanical properties for polymorphous YTaO₄ceramics

Zhou

et al. 2019

J Am Ceram Soc

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“…Another important result from FTIR analysis is the broadband at 620-660 cm −1 which appears at high Ta 2 O 5 content, assigned to Ta-O-Ta vibration in [TaO 6 ] octahedral units. 30 Therefore, the FTIR spectra suggests significant structural changes in the phosphate network caused by Ta 2 O 5 addition, similarly observed in tantalum borophosphate glasses. 19 Figure 2B shows the Raman spectra.…”

Section: Experimental Partmentioning

confidence: 72%

“…An absorption band observed around 1190 cm −1 assigned to terminal P‐O bonds in Q 2 tetrahedra decreases with the tantalum oxide content. Another important result from FTIR analysis is the broadband at 620‐660 cm −1 which appears at high Ta 2 O 5 content, assigned to Ta‐O‐Ta vibration in [TaO 6 ] octahedral units . Therefore, the FTIR spectra suggests significant structural changes in the phosphate network caused by Ta 2 O 5 addition, similarly observed in tantalum borophosphate glasses .…”

Section: Resultsmentioning

confidence: 88%

Transparent glass and glass‐ceramic in the binary system NaPO₃‐Ta₂O₅

et al. 2019

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Transparent and homogeneous tantalum phosphate glasses were prepared in the binary system (100‐x)NaPO3‐xTa2O5 with x varying from 10 to 50 mol%. Thermal, structural, and optical properties, as well as crystallization mechanisms, were investigated by thermal analysis, X‐ray diffraction, Fourier‐transform infrared spectroscopy (FTIR) and Raman spectroscopies, optical absorption, transmission electron microscopy in terms of Ta2O5 content. FTIR and Raman results support the tantalum insertion in the phosphate chains with [TaO6] polyhedra cross‐linking the phosphate units. At higher Ta2O5 content, [TaO6] clusters are formed and connected to the phosphate network by P‐O‐Ta bonds. This structural evolution is in good agreement with the thermal features measured by differential scanning calorimetry (DSC) with a strong increase of the Tg temperatures up to 920°C, high thermal stability against crystallization for low Ta2O5 content and increasing of crystallization tendency for the most Ta‐concentrated samples. Besides, due to the progressive insertion of [TaO6] units, the precipitation of Na2Ta8O21 perovskite‐like phase was identified in the sample with 50 mol% of Ta2O5. The optimal heat treatment conditions were identified using DSC measurements and a transparent glass‐ceramic from 50NaPO3 to 50Ta2O5 composition was prepared. The obtaines glass‐ceramic has great potential for optical applications, such as host for rare‐earth ions, nonlinear optical materials, and ferroelectric domain.

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“…Thermal conductivities of the SmTaO 4 , Sm 3 TaO 7 and SmTa 3 O 9 ceramics were obtained by multiplying the thermal diffusivities (ρ), specific heat (C p ) and density (ρ) according to equation (1). The thermal conductivity curve is obtained by equation (2), as shown in figure 3 (c), and the variation of thermal conductivity and thermal diffusivity are similar.…”

Section: Thermophysical Propertiesmentioning

confidence: 99%

“…Rare earth tantalate has attracted more attention in computed radiography, tomography and fluoroscopy because it is chemically stable, highly dense, and highly transparent in the UV, visible, and near infrared (NIR) regions [1][2][3][4]. The rare earth tantalate (YTaO 4 ) was first proposed by Clarke [5] as a potential thermal barrier coated ceramic material.…”

Section: Introductionmentioning

confidence: 99%

Thermophysical properties of SmTaO₄, Sm₃TaO₇ and SmTa₃O₉ ceramics

Zhou

Gan

et al. 2020

Mater. Res. Express

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SmTaO 4 , Sm 3 TaO 7 and SmTa 3 O 9 ceramics were prepared via a high temperature solid-state reaction. The results show that the phase structures of the SmTaO 4 ceramics are a monoclinic phase (space group: I2 (5)), the Sm 3 TaO 7 ceramics are an ordered orthorhombic phase (space group: Ccmm), and the SmTa 3 O 9 ceramics are an orthorhombic phase (space group: Cmmm). Macromolecular and crystal structures of Sm 3 TaO 7 and SmTa 3 O 9 are more complex than those of SmTaO 4 , which can enhance phonon scattering and reduce thermal conductivity. Compared with those of SmTaO 4 and SmTa 3 O 9 , Sm 3 TaO 7 has the smallest grain size, indicating that a small grain size has an effect on strength and ensures material stability. Because of a distorted TaO 6 octahedron and a high concentration of cation vacancy in the lattice of SmTa 3 O 9 , its thermal conductivity increases with increasing temperature. Compared with that of 7-8 YSZ, Sm 3 TaO 7 has a low thermal conductivity (1.3-1.7 W·m −1 ·K −1 at 100°C-900°C), and its minimum thermal conductivity is nearly 30% lower than that of YSZ. The Sm 3 TaO 7 ceramics have the highest TECs at approximately 9.82×10 −6 K −1 at 1200°C, which is close to that of 7-8 YSZ (approximately 10×10 −6 ). This indicates that Sm 3 TaO 7 has the potential to be employed as a thermal barrier coating.

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Yttrium tantalate containing high concentrations of Eu3+ as dopant: Synthesis and structural and luminescence features

Cited by 26 publications

References 62 publications

Theoretical and experimental investigations of mechanical properties for polymorphous YTaO₄ceramics

Theoretical and experimental investigations of mechanical properties for polymorphous YTaO₄ceramics

Transparent glass and glass‐ceramic in the binary system NaPO₃‐Ta₂O₅

Thermophysical properties of SmTaO₄, Sm₃TaO₇ and SmTa₃O₉ ceramics

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Yttrium tantalate containing high concentrations of Eu3+ as dopant: Synthesis and structural and luminescence features

Cited by 26 publications

References 62 publications

Theoretical and experimental investigations of mechanical properties for polymorphous YTaO4ceramics

Theoretical and experimental investigations of mechanical properties for polymorphous YTaO4ceramics

Transparent glass and glass‐ceramic in the binary system NaPO3‐Ta2O5

Thermophysical properties of SmTaO4, Sm3TaO7 and SmTa3O9 ceramics

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Theoretical and experimental investigations of mechanical properties for polymorphous YTaO₄ceramics

Theoretical and experimental investigations of mechanical properties for polymorphous YTaO₄ceramics

Transparent glass and glass‐ceramic in the binary system NaPO₃‐Ta₂O₅

Thermophysical properties of SmTaO₄, Sm₃TaO₇ and SmTa₃O₉ ceramics