The corrosion behavior of Mg-Al-Zn-Mn(GA9)alloy in sodium sulfate solutions was studied over a range of concentrations and solution temperatures at different pH conditions by electrochemical techniques like Tafel extr...The corrosion behavior of Mg-Al-Zn-Mn(GA9)alloy in sodium sulfate solutions was studied over a range of concentrations and solution temperatures at different pH conditions by electrochemical techniques like Tafel extrapolation and electrochemical impedance spectroscopy(EIS).The studies were carried out in solutions with sodium sulfate concentrations 0.1M,0.5M,1M,1.5M and 2M;and at five different temperatures of 30,35,40,45 and 50℃ in a pH range of 3-12.As per the experimental data,the corrosion rate of the alloy increased with the increase in temperature,and also with the increase in concentration of sodium sulfate in the medium.It was observed that the rate of corrosion decreased with the increase in pH.The activation parameters like activation energy,enthalpy of activation and entropy of activation for the corrosion process were calculated.The surface morphology of the alloy was examined before and after corrosion using scanning electron microscopy(SEM).展开更多
Luminescent materials function as optical pressure sensors based on pressure-dependent emission.Optical pressure sensors offer a broad measurement range and non-contact operation but face limitations in sensitivity.In...Luminescent materials function as optical pressure sensors based on pressure-dependent emission.Optical pressure sensors offer a broad measurement range and non-contact operation but face limitations in sensitivity.In this study,we establish a selection principle based on low-dimensional structures and conduct a high-pressure evaluation of xCr^(3+)-doped Sr_(9)Ga_(1-x)(PO_(4))_(7)(x=0.2,0.5,and 0.8)phosphor,demonstrating its exceptional pressure sensitivity.Upon excitation at 488 nm,Sr_(9)Ga_(0.5)(PO_(4))_(7):0.5Cr^(3+)displays a broad near-infrared emission peak centered at 840 nm.Specifically,the phosphor maintains its structural integrity under pressures up to 10.0 GPa,with a continuous blue shift.The fluorescence peak shifts from839.5 nm to 757.9 nm,demonstrating a high-pressure sensitivity of 8.11 nm/GPa.These findings establish Sr_(9)Ga_(0.5)(PO_(4))7:0.5Cr^(3+)as a viable candidate for optical pressure sensor,thereby offering valuable insights into advancing optical sensor development through host selection.展开更多
文摘The corrosion behavior of Mg-Al-Zn-Mn(GA9)alloy in sodium sulfate solutions was studied over a range of concentrations and solution temperatures at different pH conditions by electrochemical techniques like Tafel extrapolation and electrochemical impedance spectroscopy(EIS).The studies were carried out in solutions with sodium sulfate concentrations 0.1M,0.5M,1M,1.5M and 2M;and at five different temperatures of 30,35,40,45 and 50℃ in a pH range of 3-12.As per the experimental data,the corrosion rate of the alloy increased with the increase in temperature,and also with the increase in concentration of sodium sulfate in the medium.It was observed that the rate of corrosion decreased with the increase in pH.The activation parameters like activation energy,enthalpy of activation and entropy of activation for the corrosion process were calculated.The surface morphology of the alloy was examined before and after corrosion using scanning electron microscopy(SEM).
基金supported by National Natural Science Foundation of China(Nos.12404024,12174144,12474009)Natural Science Foundation of Guangdong Province(Nos.2023A1515012706,2022A1515011669)+3 种基金Open Project of State Key Laboratory of Superhard Materials,Jilin University(No.202414)Cooperative education platform of Guangdong Province(No.(2016)31)Basic and Applied Basic Research Foundation of Jiangmen(No.2020030102940008548)the Science Foundation for High-level Talents of Wuyi University(Nos.2021AL019,2019AL029)。
文摘Luminescent materials function as optical pressure sensors based on pressure-dependent emission.Optical pressure sensors offer a broad measurement range and non-contact operation but face limitations in sensitivity.In this study,we establish a selection principle based on low-dimensional structures and conduct a high-pressure evaluation of xCr^(3+)-doped Sr_(9)Ga_(1-x)(PO_(4))_(7)(x=0.2,0.5,and 0.8)phosphor,demonstrating its exceptional pressure sensitivity.Upon excitation at 488 nm,Sr_(9)Ga_(0.5)(PO_(4))_(7):0.5Cr^(3+)displays a broad near-infrared emission peak centered at 840 nm.Specifically,the phosphor maintains its structural integrity under pressures up to 10.0 GPa,with a continuous blue shift.The fluorescence peak shifts from839.5 nm to 757.9 nm,demonstrating a high-pressure sensitivity of 8.11 nm/GPa.These findings establish Sr_(9)Ga_(0.5)(PO_(4))7:0.5Cr^(3+)as a viable candidate for optical pressure sensor,thereby offering valuable insights into advancing optical sensor development through host selection.
基金国家自然科学基金(批准号:5117108450871056)+1 种基金宁波市国际合作项目(批准号:2011D10012)资助的课题the We should also acknowledge the support from Wang Kuancheng Education Foundation~~
