CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Xin Xu,Lin-Lin Zhu,Min-Min Dai,Cheng-Cai Zhao,Guang-Xiang Zhang,Yu-Jian Jian,Hua-Tay Lin
Highly transparent polycrystalline Tm 2 O 3 ceramics were successfully fabricated by vacuum sintering at temperatures from 1650 to 1850 °C for 8 h using commercial Tm 2 O 3 and ZrO 2 (1 at%) powders as starting materials. It is the first time that ZrO 2 was reported as a sintering additive to prepare Tm 2 O 3 transparent ceramics. The effects of sintering temperature on the optical transmittance and microstructure of Tm 2 O 3 transparent ceramics were studied. The desired Tm 2 O 3 ceramics with relative density of 99.8% and an average grain size of approximately 9.7 μm were obtained at 1800 °C and the in-line transmittance reached 75% at 880 nm and fluctuated around 80% from 2100 to 2400 nm, respectively. This study demonstrated that Tm 2 O 3 transparent ceramics with higher in-line transmittance and smaller grain size could be prepared by using ZrO 2 as sintering additive at a relatively lower vacuum sintering temperature compared to those already reported in open literatures.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2025
·
IF 2.2
Chong gui Lei,Fei ruan,Xi Wu,Jinxiao Bao,Yonghe Zhang,Yuwei Ma,Junting Yang,Guoqi Liu
To understand the microstructure and electrochemical performance of Tm-doped CaZrO3-based proton conductor in more detail, CaZr1−xTmxO3−δ (x=0, 0.025, 0.05, 0.075 and 0.1) proton-conducting electrolyte samples were prepared by solid state reaction method at 1523 and 1873 K for 8 hours. The crystal structure of the proton-conducting solid electrolyte was characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive spectroscopy. An electrochemical workstation was used to measure the electrical conductivity, the H/D isotope effect, and the chemical diffusion coefficient of hydrogen for the CaZr1−xTmxO3−δ electrolyte. According to the results, the total conductivity of electrolyte CaZr1-xTmxO3-δ falls in 4.83×10-6 ~ 7.22×10-4 S/cm and the conductivity activation energy is 0.78 to 1.37 eV in oxygen and hydrogen atmosphere at 973 to 1173℃. The chemical diffusion coefficient of proton in CaZr1-xTmxO3-δ proton conductor is between 5.9×10-7 and 4.5×10-6 cm2/s in the temperature range of 973 to 1373 K and the diffusion activation energy is 55486 kJ/mol. The interstitial proton concentration falls in 7.97×10-4~1.21×10-3 at 973 to 1073 K under hydrogen rich atmosphere. When the doping concentration (mol/mol) of Tm is 0.05, the electrolyte specimen has excellent electrochemical performance, the concentration of non-associated state Tm is approximately 2% of the total doping amount.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Lin-Lin Zhu,Xin Xu,Min-Min Dai,Yu-Jian Jian,Guang-Xiang Zhang,Cheng-Cai Zhao,Hua-Tay Lin
Thulium oxide (Tm 2 O 3 ) transparent ceramics with outstanding optical transparency were successfully prepared with various contents (0–4 at%) of zirconia (ZrO 2 ) added as sintering additive using pressureless vacuum sintering at 1850 °C for 8 h. The effect of ZrO 2 content on the changes of microstructure, transparency, Vickers hardness , fracture toughness, and thermal conductivity of Tm 2 O 3 transparent ceramics were systematically investigated in this research. The experimental measurements showed that the in-line transmittance of 3 at% ZrO 2 -doped Tm 2 O 3 transparent ceramics with the grain size of 6.7 μm was 76.3% at the wavelength of 880 nm and approximately 85% in the range of 2100–2500 nm. In addition, the Vickers hardness and fracture toughness were significantly improved from 7.8 ± 0.4 to 10.2 ± 0.2 GPa and 0.97 ± 0.06 to 1.32 ± 0.10 MPa m 1/2 , respectively, with content of ZrO 2 increasing from 0 to 4 at%, while on the contrary the thermal performance was observed to decrease. This study showed that the in-line transmittance of Tm 2 O 3 ceramics with favorably combined optical and mechanical properties could be achieved by the proper tailoring of ZrO 2 content.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Crystals
·
2023
·Vol. 13
·期 3
·460
·
IF 2.7
Danni Huang,Tong Xiao,Beibei Fu,Shoulei Xu,Yuyang Huang,Wen Deng,Zhukun Zhou
ZrO2is an attractive host matrix for luminescence material because of its excellent physical properties, such as low phonon energy and wide band gap. In this work, the highly transparent Tm2O3and Yb2O3co-doped yttria stabilized zirconia (YSZ) (abbreviated as Yb/Tm: YSZ) single crystals were grown by the optical floating zone method. The Yb/Tm: YSZ samples were stabilized in the cubic phase at room temperature when Yb3+and Tm3+replaced Y3+. The influence of Yb3+co-doping on the up-conversion luminescence properties of the crystals was systematically studied. A total of 0.5 mol% Tm2O3and 2.0 mol% Yb2O3co-activated YSZ single crystal (abbreviated as 2.0Yb/Tm: YSZ) has the maximum luminous intensity. There were seven absorption peaks located at around 358, 460, 679, 783.3, 850–1000, 1200, and 1721.5 nm that were observed in the absorption spectrum of the 2.0Yb/Tm: YSZ single crystal. There were three up-conversion peaks at around 488, 658 and 800 nm that were observed when the Yb/Tm: YSZ samples were excitated at 980 nm. The fluorescence lifetime of Tm3+for the1G4→3H6transition of the 2.0Yb/Tm: YSZ sample is 7.716 ms as excited with a 980 nm laser. In addition, the oscillator strength parameters Ωλ(λ = 2, 4 and 6) of this sample were derived by the Judd–Ofelt theory to evaluate the laser performance of the host materials. The ratio Ω4/Ω6of this sample is 0.80, implying its excellent laser output. Therefore, the 2.0Yb/Tm: YSZ single crystal is a considerable potential material for laser and luminescence applications.Keywords:YSZ single crystal;Yb3+and Tm3+co-activated;optical floating zone method;up-conversion luminescence;Judd–Ofelt theory
研究领域:
材料科学
·
光学
·
激光物理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）