Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials

Wang, Jing; Xu, Fang; Wheatley, Richard J.; Choy, Kwang‐Leong; Neate, Nigel; Hou, Xianghui

doi:10.1016/j.matdes.2015.07.022

Cited by 15 publications

(5 citation statements)

References 30 publications

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“…However, the diffraction peak of the CdTe/Yb-TCPP heterojunction shifts to a lower angle relative to Yb-TCPP nanoflowers, attributed to the ionic radius of Cd 2+ (0.97 Å) being larger than the ionic radius of Yb 3+ (0.87 Å). Consequently, the incorporation of Cd 2+ into the Yb-TCPP nanoflowers induces lattice distortions. , This evidence confirms the successful synthesis of Yb-TCPP and the CdTe/Yb-TCPP heterojunction.…”

Section: Resultssupporting

confidence: 71%

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Integrated Photoelectrochemical-SERS Platform Based on Plasmonic Metal–Semiconductor Heterostructures for Multidimensional Charge Transfer Analysis and Enhanced Patulin Detection

Liu,

Meng,

et al. 2024

ACS Sens.

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Comprehending the charge transfer mechanism at the semiconductor interfaces is crucial for enhancing the electronic and optical performance of sensing devices. Yet, relying solely on single signal acquisition methods at the interface hinders a comprehensive understanding of the charge transfer under optical excitation. Herein, we present an integrated photoelectrochemical surface-enhanced Raman spectroscopy (PEC-SERS) platform based on quantum dots/metal−organic framework (CdTe/Yb-TCPP) nanocomposites for investigating the charge transfer mechanism under photoexcitation in multiple dimensions. This integrated platform allows simultaneous PEC and SERS measurements with a 532 nm laser. The obtained photocurrent and Raman spectra of the CdTe/Yb-TCPP nanocomposites are simultaneously influenced by variable bias voltages, and the correlation between them enables us to predict the charge transfer pathway. Moreover, we integrate gold nanorods (Au NRs) into the PEC-SERS system by using magnetic separation and DNA biometrics to construct a biosensor for patulin detection. This biosensor demonstrates the voltage-driven ON/OFF switching of PEC and SERS signals, a phenomenon attributed to the plasmon resonance effect of Au NRs at different voltages, thereby influencing charge transfer. The detection of patulin in apples verified the applicability of the biosensor. The study offers an efficient approach to understanding semiconductor−metal interfaces and presents a new avenue for designing high-performance biosensors.

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Section: Resultssupporting

confidence: 71%

“…Consequently, the incorporation of Cd 2+ into the Yb-TCPP nanoflowers induces lattice distortions. 30,31 This evidence confirms the successful synthesis of Yb-TCPP and the CdTe/Yb-TCPP heterojunction.…”

Section: Resultssupporting

confidence: 64%

Integrated Photoelectrochemical-SERS Platform Based on Plasmonic Metal–Semiconductor Heterostructures for Multidimensional Charge Transfer Analysis and Enhanced Patulin Detection

Liu,

Meng,

et al. 2024

ACS Sens.

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“…The theory density ( ℎ ) of each pellet was calculated using equation (3) [12]. The volume of unit cell was calculated from lattice parameters as obtained from XRD results.…”

Section: Characterizationsmentioning

confidence: 99%

“…And also, the coefficient of thermal expansion between top ceramic coating and metal alloy are quite different, which is easy to generate stress between the layers due to the expansion mismatch, thus it is also very important to increase the thermal expansion of ceramic top coat materials. K -1 for coefficient of thermal expansion) [12]. So far, the study of YGA for TBC application is mainly based on un-doped YAG, to construct TBC bilayer consisting of porous YSZ with YAG top layer [7,13,14].…”

Section: Introductionmentioning

confidence: 99%

Yb3+ doping effects on thermal conductivity and thermal expansion of yttrium aluminium garnet

Wang

Wheatley

et al. 2016

Ceramics International

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Yttrium Aluminium Garnet (YAG) is an attractive candidate as thermal barrier material used for turbine blade in aero engines, due to its relatively low thermal conductivity, low oxygen diffusivity and good phase stability at high temperature. YAG has a complex crystal structure, in which Y 3+ ions locate in dodecahedron and Al 3+ ions in octahedron and tetrahedron.Replacing the host cations with rare earth elements can cause the structure change which influences the thermal properties of YAG. Because the space inside the octahedron is relatively small, Yb 3+ ions which have the smallest ionic radial size in the lanthanide series, have been selected and attempted to be doped on dodecahedral and octahedral sites to investigate the effects on thermal conductivity and thermal expansion.

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“…The rare earth stannate (RE 2 Sn 2 O 7 ) with a pyrochlore structure exhibits excellent optical and dielectric properties [13,14], good chemical stability [15], and low thermal conductivity [16] and may have the potential to be radiative cooling ceramic materials. La 2 Sn 2 O 7 [17] possesses a wide band gap (E g = 3.2 eV) and will maintain high NIR solar reflectivity based on band structure and electron transition theory [18].…”

Section: Introductionmentioning

confidence: 99%

High-entropy rare earth stannate ceramics: Acid corrosion resistant radiative cooling materials with high atmospheric transparency window emissivity and high near-infrared solar reflectivity

Chen,

He,

Pan

et al. 2024

Journal of Advanced Ceramics

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In response to the development of the concepts of "carbon neutrality" and "carbon peak", it is critical to developing materials with high near-infrared (NIR) solar reflectivity and high emissivity in the atmospheric transparency window (ATW; 8-13 μm) to advance zero energy consumption radiative cooling technology. To regulate emission and reflection properties, a series of high-entropy rare earth stannate ceramics (HE-RE 2 Sn 2 O 7 : (Y 0.2 La 0.2 Nd 0.2 Eu 0.2 Gd 0.2 ) 2 Sn 2 O 7 , (Y 0.2 La 0.2 Sm 0.2 Eu 0.2 Lu 0.2 ) 2 Sn 2 O 7 , and (Y 0.2 La 0.2 Gd 0.2 Yb 0.2 Lu 0.2 ) 2 Sn 2 O 7 ) with severe lattice distortion were prepared using a solid phase reaction followed by a pressureless sintering method for the first time. Lattice distortion is accomplished by introducing rare earth elements with different cation radii and mass. The as-synthesized HE-RE 2 Sn 2 O 7 ceramics possess high ATW emissivity (91.38%-95.41%), high NIR solar reflectivity (92.74%-97.62%), low thermal conductivity (1.080-1.619 W•m −1 •K −1 ), and excellent chemical stability. On the one hand, the lattice distortion intensifies the asymmetry of the structural unit to cause a notable alteration in the electric dipole moment, ultimately enlarging the ATW emissivity. On the other hand, by selecting difficult excitation elements, HE-RE 2 Sn 2 O 7 , which has a wide band gap (E g ), exhibits high NIR solar reflectivity. Hence, the multi-component design can effectively enhance radiative cooling ability of HE-RE 2 Sn 2 O 7 and provide a novel strategy for developing radiative cooling materials.Keywords: radiative cooling materials; high-entropy ceramics (HECs); rare earth stannate (RE 2 Sn 2 O 7 ); high atmospheric transparency window emissivity; high near-infrared (NIR) solar reflectivity

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Investigation of La3+ Doped Yb2Sn2O7 as new thermal barrier materials

Abstract: Low thermal conductivity is one of the key requirements for thermal barrier coating materials.

Cited by 15 publications

References 30 publications

Integrated Photoelectrochemical-SERS Platform Based on Plasmonic Metal–Semiconductor Heterostructures for Multidimensional Charge Transfer Analysis and Enhanced Patulin Detection

Integrated Photoelectrochemical-SERS Platform Based on Plasmonic Metal–Semiconductor Heterostructures for Multidimensional Charge Transfer Analysis and Enhanced Patulin Detection

Yb3+ doping effects on thermal conductivity and thermal expansion of yttrium aluminium garnet

High-entropy rare earth stannate ceramics: Acid corrosion resistant radiative cooling materials with high atmospheric transparency window emissivity and high near-infrared solar reflectivity

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