JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Gang Qu,Jingkai Zhou,Dandan Huang
The phase relationships of the ternary system Eu 2 O 3 - La 2 O 3 - ZrO 2 and binary Eu 2 O 3 - La 2 O 3 subsystem were experimentally and thermodynamically studied. Six three-phase fields and nine two-phase ones in the Eu 2 O 3 - La 2 O 3 - ZrO 2 system were investigated by X-ray diffraction, scanning electron microscopy and electron probe microanalysis with wavelength dispersive spectrometer at 1873 K and 1673 K. Nevertheless, there only existed a two-phase region in the Eu 2 O 3 - La 2 O 3 system in the temperature range from 1873 K to 1673 K. After that, the ternary mixing parameters for the system Eu 2 O 3 - La 2 O 3 - ZrO 2 including the binary interaction parameters in the Eu 2 O 3 - La 2 O 3 subsystem are optimized with the CALPHAD (CALculation of PHAse Diagrams) method, based on obtained experimental results. The high-temperature phase relationships and the special type of continuous solid solutions (La 2-x Eu x Zr 2 O 7 ) investigated in present work will contribute to exploring new materials with specific properties such as optical transparency.
研究领域:
材料科学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2015
·Vol. 7
·期 34
·14248-14253
·
IF 7.394
Weidong Han,Bin Ding,Mira Park,Fuhai Cui,Zafar Khan Ghouri,Prem Singh Saud,Hak-Yong Kim
Novel luminescent and amorphous La2O3–ZrO2:Eu3+ (LZE) nanofibrous membranes with robust softness are fabricated for the first time via a facile electrospinning technique. By incorporating zirconium oxide, the as-prepared lanthanum oxide nanofibrous membranes can be dramatically changed from extreme fragility to robust softness. Meanwhile, the softness and luminescent performance of LZE nanofibrous membranes can be finely controlled by regulating the doping concentration of zirconium oxide and europium in lanthanum oxide nanofibers. Additionally, the crystal structure analysis using X-ray diffractometer and high resolution transmission electron microscopy measurements have confirmed the correlation between the amorphous structure and softness. Furthermore, LZE membranes show the characteristic emission of Eu3+ corresponding to 5D0, 1, 2–7F0, 1, 2, 3, 4 transitions due to an efficient energy transfer from O2− to Eu3+. The LZE nanofibrous membranes with the optimum doping Eu3+ concentration of 3 mol% exhibit excellent softness and luminescent properties, which make the materials to have potential applications in fluorescent lamps and field emission displays.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Acta Biomaterialia
·
2017
·
IF 6.319
Qiuyue Yang,Wei Yuan,Xiangmei Liu,Yufeng Zheng,Zhenduo Cui,Xianjin Yang,Haobo Pan,Shuilin Wu
The biodegradability and good mechanical property of magnesium alloys make them potential biomedical materials . However, their rapid corrosion rate in the human body’s environment impairs these advantages and limits their clinical use. In this work, a compact zirconia (ZrO 2 ) nanofilm was fabricated on the surface of a magnesium-strontium (Mg-Sr) alloy by the atomic layer deposition (ALD) method, which can regulate the thickness of the film precisely and thus also control the corrosion rate. Corrosion tests reveal that the ZrO 2 film can effectively reduce the corrosion rate of Mg-Sr alloys that is closely related to the thickness of the film. The cell culture test shows that this kind of ZrO 2 film can also enhance the activity and adhesion of osteoblasts on the surfaces of Mg-Sr alloys. Statement of Significance The significance of the current work is to develop a zirconia nanofilm on biomedical MgSr alloy with controllable thickness precisely through atomic layer deposition technique. By adjusting the thickness of nanofilm, the corrosion rate of Mg-Sr alloy can be modulated, thereafter, the degradation rate of Mg-based alloys can be controlled precisely according to actual clinical requirement. In addition, this zirconia nanofilm modified Mg-Sr alloys show excellent biocompatibility than the bare samples. Hence, this work provides a new surface strategy to control the degradation rate while improving the biocompatibility of substrates.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zhi Dong,Songhua Chen,Shaocun Liu,Zongqing Ma,Liming Yu
As a promising route to prepare ultrafine-grained or nanocrystalline materials, powder metallurgy has long been used to produce some metal materials with desirable microstructure. However, the challenges of rapid grain growth and torpid densification during this process always frustrate the endeavor. Especially, for the oxide dispersion strengthened (ODS) alloy, although grain growth is suppressed greatly by the traditional oxide addition, the densification of metal matrix is also hindered, especially at low temperature. To overcome such limitation, exploring a kind of oxide that can be used as both grain growth inhibitor and sintering accelerator for metal matrix will be significant. In this work, it is found that accelerated sintering can be achieved in Mo-ZrO 2 system at low temperature. The kinetic simulation results indicate that although the volume diffusion has been found to be the dominant sintering mechanism for Mo-ZrO 2 system, a significant contribution from grain boundary diffusion is also identified, which is the essential mechanism behind the accelerated sintering of this system at low temperature. Besides, the grain boundary migration also can be significantly restricted by the intergranular ZrO 2 particles. After sintering at only 1480 °C in the absence of external pressure assistance and subsequent hot forging , nanocrystalline microstructure with an average grain size of 480 nm can be obtained. The ZrO 2 second-phase particles are uniformly distributed at grain interior and grain boundaries, enhancing the recrystallization temperature and microstructural stability of metal matrix, which renders the prepared Mo-ZrO 2 alloy a stable high-strength performance characteristic even under high temperatures.
研究领域:
材料科学
·
金属学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Yiting Cai,Zheqi Chen,Yang Gao,Jiali Tang,Jie Mao,Dan Wang,Jian-Feng Chen,Yingwu Luo
Dielectric elastomer is a kind of attractive artificial muscle with fast and reversible deformation excited by applied voltages . Typical dielectric elastomers suffer from low dielectric breakdown strength , which limits the achievable electro-actuation performance. We report that the introduction of surface-modified ZrO 2 nanoparticles in dielectric elastomer (poly(styrene- b -butyl acrylate- b -styrene)) can significantly increase the dielectric breakdown strength. We highlight that the surface modifier molecules for ZrO 2 nanoparticles should be designed to have an oligomeric chain compatible with the elastomer matrix to relieve the entropy loss of the elastomer chains. Thus, good dispersion of the nanoparticles can be achieved and the modulus is mildly increased. As a result, the maximum electro-actuation area strain is increased by a factor of 2.0 (from 19.1% to 37.8%), and the maximum energy density by a factor of 9.2 (from 5.96 kJ/m 3 to 55.15 kJ/m 3 ) by adding 1.7 vol% ZrO 2 of 8 nm.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
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