The effect of Gd3+ and Ti4+ co-doping on the thermal radiation performance of (Sm1-xGdx)2(Hf1-xTix)2O7 (0 ≤ x ≤ 0.2) ceramic coatings

Ma, Rujiang; Li, Zongchang; Liu, Fusheng

doi:10.1016/j.ceramint.2019.05.131

Cited by 11 publications

(2 citation statements)

References 19 publications

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“…The electrical and optical properties of perovskite materials (ABO 3 ) can be improved via A- [7][8][9] or B-site doping [10][11][12] and by regulating the concentration of oxygen vacancies. 13,14 Gao et al 15 synthesized La 0.9 Sr 0.1 TiO 3+δ (LST)-layered perovskite ceramics by doping Sr 2+ ions at the A-sites and obtained a ceramic with high optical reflectance, which was comparable to that of some metals (Al, Cu, Ag), 16 rendering it a suitable laser thermal protection material.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Nb⁵⁺doping for enhanced optical reflectivity and improved thermophysical properties of La_0.9Sr_0.1Ti₁₋_xNb_xO₃₊_δ

Zhu

Wang

et al. 2022

J Am Ceram Soc.

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Thermal protection materials with high optical reflectivity, low thermal conductivity, and good high‐temperature stability are required for the development of laser technologies and the protection of the critical equipment components. Herein, we synthesize a novel thermal protective material, La0.9Sr0.1Ti1−xNbxO3+δ (LSTN; x = 0.1, 0.125, 0.15), with different Nb5+‐ion contents using solid‐state sintering. Phase structure analysis demonstrates that LSTN (x = 0.1, 0.125, 0.15) presents a single‐phase monoclinic structure with a uniform element distribution. In particular, the LSTN0.125 ceramic exhibits ultrahigh optical reflectivity (96%, 2300 nm) and excellent thermophysical properties, such as a high thermal expansion coefficient (10.3 × 10−6 K−1, 1000°C), an ultralow thermal conductivity (0.408 W (m K)−1, 300°C), and excellent high‐temperature stability. Aberration‐corrected scanning transmission electron microscopy reveals that the disordered substitution of Nb5+ ions induces numerous lattice distortions and mass fluctuations, which decrease the thermal conductivity, and makes difference in the relative refractive indices of atomic layers causing the high reflectivity of the material. These remarkable properties render the LSTN0.125 ceramic as an ideal alternative for near‐infrared thermal protection applications.

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Section: Introductionmentioning

confidence: 99%

“…The electrical and optical properties of perovskite materials (ABO 3 ) can be improved via A‐ 7–9 or B‐site doping 10–12 and by regulating the concentration of oxygen vacancies 13,14 . Gao et al 15 .…”

Section: Introductionmentioning

confidence: 99%

Optimal Nb⁵⁺doping for enhanced optical reflectivity and improved thermophysical properties of La_0.9Sr_0.1Ti₁₋_xNb_xO₃₊_δ

Zhu

Wang

et al. 2022

J Am Ceram Soc.

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A Promising Radiation Thermal Protection Coating Based on Lamellar Porous Ca‐Cr co‐Doped Y₃NbO₇ Ceramic

Chen

Zou

et al. 2023

Adv Funct Materials

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Dissipation of heat efficiently from a hot object via radiation while minimizing the inward heat conduction is the key requirement of radiation thermal protection. In this study, a Ca‐Cr co‐doped Y3NbO7 coating with lamellar porous structure is fabricated, which shows an ultra‐low thermal conductivity (<0.7 W m−1 K−1) and near‐unity emissivity (>0.9) across a broad wavelength range of ≈1–24 µm. This record high emissivity to thermal conductivity ratio (≈1.3) is experimentally and theoretically revealed from a multi‐scale perspective. The diffusoin‐mediated thermal conduction feature of niobates combined with lamellar porous structure of the coating reduces its thermal conductivity to an impressive 0.5 W m−1 K−1 at 25 °C, surpassing the theoretical amorphous limitation of 0.72 W m−1 K−1. Experiments and FDTD calculation results demonstrate that the intrinsic emissivity dips at shallow extinction wavelengths (1 and 8 µm) and strong phonon‐polariton resonances wavelengths (>13 µm) can be effectively compensated by the multiple scattering/absorption and gradual modulation of conical shape/effective refractive index induced by surface micro‐protrusion structures, respectively. Furthermore, the coating exhibits robust mechanical and thermal stability with a high bonding strength (18.3 MPa) and thermal expansion coefficient (≈11 × 10−6 K−1 at 1200 °C) comparable to YSZ, showing great potential in the radiation thermal protection field.

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Synthesis and thermophysical performances of complex Ca3Ln3Ti7Ta2O26.5 (Ln=Dy and Er) oxides

Zhang

Tong

Yang

et al. 2020

Ceramics International

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The effect of Gd3+ and Ti4+ co-doping on the thermal radiation performance of (Sm1-xGdx)2(Hf1-xTix)2O7 (0 ≤ x ≤ 0.2) ceramic coatings

Cited by 11 publications

References 19 publications

Optimal Nb⁵⁺doping for enhanced optical reflectivity and improved thermophysical properties of La_0.9Sr_0.1Ti₁₋_xNb_xO₃₊_δ

Optimal Nb⁵⁺doping for enhanced optical reflectivity and improved thermophysical properties of La_0.9Sr_0.1Ti₁₋_xNb_xO₃₊_δ

A Promising Radiation Thermal Protection Coating Based on Lamellar Porous Ca‐Cr co‐Doped Y₃NbO₇ Ceramic

Synthesis and thermophysical performances of complex Ca3Ln3Ti7Ta2O26.5 (Ln=Dy and Er) oxides

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The effect of Gd3+ and Ti4+ co-doping on the thermal radiation performance of (Sm1-xGdx)2(Hf1-xTix)2O7 (0 ≤ x ≤ 0.2) ceramic coatings

Cited by 11 publications

References 19 publications

Optimal Nb5+doping for enhanced optical reflectivity and improved thermophysical properties of La0.9Sr0.1Ti1−xNbxO3+δ

Optimal Nb5+doping for enhanced optical reflectivity and improved thermophysical properties of La0.9Sr0.1Ti1−xNbxO3+δ

A Promising Radiation Thermal Protection Coating Based on Lamellar Porous Ca‐Cr co‐Doped Y3NbO7 Ceramic

Synthesis and thermophysical performances of complex Ca3Ln3Ti7Ta2O26.5 (Ln=Dy and Er) oxides

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Optimal Nb⁵⁺doping for enhanced optical reflectivity and improved thermophysical properties of La_0.9Sr_0.1Ti₁₋_xNb_xO₃₊_δ

Optimal Nb⁵⁺doping for enhanced optical reflectivity and improved thermophysical properties of La_0.9Sr_0.1Ti₁₋_xNb_xO₃₊_δ

A Promising Radiation Thermal Protection Coating Based on Lamellar Porous Ca‐Cr co‐Doped Y₃NbO₇ Ceramic