The non-volatile multi-level magnetic or resistance states switching is extremely promising for newgeneration high-density information storage.In this work,we propose a novel multiple-state magnetic memory based on th...The non-volatile multi-level magnetic or resistance states switching is extremely promising for newgeneration high-density information storage.In this work,we propose a novel multiple-state magnetic memory based on the magnetic deflagration in a single Laves-phase Tb_(0.95)Mn_(1.5)Co_(0.5)compound with non-volatile and multilevel magnetic states switching.In consideration of the negative magnetization,six different magnetic states are achieved by simply applying the magnetic field.The abinitio calculations and neutron diffraction measurements indicate that the studied compound is a cubic structure withferromagnetic ordering at low temperature and the evolution in magnetic states(i.e.magnetic deflagration)should arise from the Barkhausen effect.The almost unchanged magnetic state under corresponding range of magnetic field enables the magnetization to be in the same magnitude even after 50 cyclic hysteresis loops.Furthermore,the retention,repeatable switching,and non-volatile characters of multi-level magnetic state have been primely confirmed.All these suggest that the Tb_(0.95)Mn_(1.5)Co_(0.5)compound with multiple magnetic deflagrations could be applied to multiple-state magnetic memory and this work would pave the way to design a novel multi-level magnetic storage.展开更多
The magnetic refrigeration(MR)based on the principle of magnetocaloric effect(MCE)in magnetic materials was recognized as an alternative cooling way to our present commercialized vapor compression cycle technology.Evi...The magnetic refrigeration(MR)based on the principle of magnetocaloric effect(MCE)in magnetic materials was recognized as an alternative cooling way to our present commercialized vapor compression cycle technology.Evidently,a vital prerequisite for practical applications is the exploration of candidate materials with prominent magnetocaloric performances.In this paper,the polycrystalline garnet RE_(3)Al_(5)O_(12)(RE=Tb,Dy and Ho)compounds with the cubic structure(space group:Ia3d)were prepared using the Pechini sol-gel method,and their crystal structure,magnetic properties and comprehensive magnetocaloric performances were studied.The analysis of magnetic susceptibility curves in a static magnetic field H=0.1 T reveal that the Dy_(3)Al_(5)O_(12)undergoes antiferromagnetic transition with Néel temperature TN≈2.6 K,whereas the Tb_(3)Al_(5)O_(12)and Ho_(3)Al_(5)O_(12)exhibit no features indicative of the magnetic ordering processes down to 1.8 K.The comprehensive magnetocaloric performances,namely the maximum magnetic entropy change and relative cooling power,are derived indirectly from the isothermal field-dependent magnetization data,which yield 11.72,10.42,7.53 J/(kg·K)and 84.56,69.52,70.35 J/kg for the Tb_(3)Al_(5)O_(12),Dy_(3)Al_(5)O_(12)and Ho_(3)Al_(5)O_(12)under a low field change(ΔH)of 0-2 T,respectively.The superior comprehensive magnetocaloric performances and wide operating temperature range of these compounds under lowΔH make them attractive for cryogenic MR technology.展开更多
基于含硒衍生物在癌症治疗中发挥的重大作用,文中以前期合成的2-(2-苯氨甲酰基甲硫基-1,3,4-噻二唑-5-基)-1,2-苯并异硒唑-3(2H)-酮化合物(2-(2-phenylaminomethylthio-1,3,4-thiadiazol-5-yl-1),2-benziselenazol-3(2H)-one compound,P...基于含硒衍生物在癌症治疗中发挥的重大作用,文中以前期合成的2-(2-苯氨甲酰基甲硫基-1,3,4-噻二唑-5-基)-1,2-苯并异硒唑-3(2H)-酮化合物(2-(2-phenylaminomethylthio-1,3,4-thiadiazol-5-yl-1),2-benziselenazol-3(2H)-one compound,PTBO)为受试药,通过体外细胞培养,结合转录组测序方法,考察该衍生物对人乳腺癌细胞(michigan cancer foundation-7,MCF-7)的基因表达的影响,分析基因表达的差异,以期为该含PTBO对肿瘤细胞的抑制作用机制的研究提供参考。结果证明,与未经处理的MCF-7细胞相比,PTBO引起基因差异表达2561个,其中差异表达基因上调1744个,差异表达基因下调817个。通过GO(geneontology)功能富集和KEGG(kyoto encyclopedia of genes and genomes)通路分析发现,PTBO会导致蛋白质分解、蛋白质的衰变等相关基因的差异表达;通过下调包括周期蛋白依赖性激酶4和6(cyclin-dependent kinase 4/6,CDK4/CDK6)等基因表达,PTBO可以调控P53信号通路和肿瘤坏死因子(tumour necrotizing factor,TNF)信号通路,并显著上调了抑癌基因(P53)、细胞周期抑制基因(P21)和死亡结构域蛋白(fas associated via death domain,FADD)的表达,从而阻止细胞周期、导致肿瘤细胞凋亡。展开更多
Fe–Ga sheets with large magnetostriction are required for improving the conversion efficiency under the ultra-high frequencymagnetic field. Trace Tb element doping can simultaneously improve the magnetostriction and ...Fe–Ga sheets with large magnetostriction are required for improving the conversion efficiency under the ultra-high frequencymagnetic field. Trace Tb element doping can simultaneously improve the magnetostriction and ductility of Fe–Ga alloy. However, the im-pact of trace Tb doping on the microstructure and magnetostriction of Fe–Ga thin sheets is an open question. In this paper, the effects oftrace Tb addition on the secondary recrystallization and magnetostriction of Fe–Ga thin sheets are systematically studied by comparing thecharacteristics evolution of precipitation, texture, and nanoinclusions. The results indicate that trace Tb addition accelerates the secondaryrecrystallization of Goss texture due to the combined action of the bimodal size distributed precipitates, smaller grains, and more HEGBsin primary recrystallization. After quenching at 900℃, the magnetostriction value in 0.07 at %Tb-doped Fe_(81)Ga_(19) thin sheets increases by 30% to that of Fe_(81)Ga_(19) thin sheets. The increase in magnetostriction is attributed to the decrease in the number of Tb-rich precipitates andthe higher density of the nanometer-sized modified-D0_(3) inclusions induced by the dissolving of trace Tb elements after quenching. Theseresults demonstrate a simple and efficient approach for preparing Fe–Ga thin sheets with a large magnetostrictive coefficient by a combin-ation of trace RE element addition and conventional rolling method.展开更多
Inorganic lead-free double perovskites have the advantages of low toxicity,broadband emission,and good stability,which make them promising luminescent materials for lighting applications.However,due to the limited reg...Inorganic lead-free double perovskites have the advantages of low toxicity,broadband emission,and good stability,which make them promising luminescent materials for lighting applications.However,due to the limited regulation of their self-trapped exciton emission,it is still greatly challenging to achieve white light emitting from a single double perovskite host.Herein,efficient and tunable white light is realized in Cs_(2)NalnCl_(6)∶Sb^(3+),Tb^(3+),Sm^(3+)double perovskite by controlling the ratios of the doped three ions with blue,green,and red emissions,respectively.The steady-state and transient fluorescence spectra of singly-and doubly-doped double perovskites reveal the existence of multiple energy transfer channels in the triply-doped phosphors,including from Sb^(3+)to Tb^(3+),Sb^(3+)to Sm^(3+),and Tb^(3+)to Sm^(3+).Benefiting from these channels,the color coordinates of the triply-doped phosphors can cross the whole white light area of the CIE chromaticity diagram by adjusting the ratios of the three dopants,and the maximum internal quantum yield of the white light phosphors is 66.61%.The white emission phosphors show the characteristic of being independent of excitation wavelength within 310-360 nm.Furthermore,the emission intensity at 430 K of the white light phosphor Cs_(2)NalnCl_(6)∶0.01Sb^(3+),0.65Tb^(3+),0.20Sm^(3+)remains 50% of that at room temperature.A WLED device fabricated with the phosphor and a 365 nm LED chip exhibits a high color rendering index of 90.9,correlated color temperature of 5469 K,and CIE coordinates of(0.333 and 0.328).The results indicate that the as-prepared double perovskite materials are promising candidates in the solid-state lighting field.展开更多
基金financially supported by the National Natural Science Foundation of China(No.52061014)the Natural Science Foundation of Henan Province(No.242300420352)+4 种基金the Key research and development program of Henan province(No.231111222200)the Key Scientific Research Projects of Higher Education Institutions in Henan Province(No.25CY025)the Leading Talents Program of Jiangxi Provincial Major Discipline Academic and Technical Leaders Training Program(No.20204BCJ22004)the Open Project awarded by Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials(No.QMNEM2002)Jiangxi Provincial Key Laboratory of Magnetic Metallic Materials and Devices(No.2024SSY05061)
文摘The non-volatile multi-level magnetic or resistance states switching is extremely promising for newgeneration high-density information storage.In this work,we propose a novel multiple-state magnetic memory based on the magnetic deflagration in a single Laves-phase Tb_(0.95)Mn_(1.5)Co_(0.5)compound with non-volatile and multilevel magnetic states switching.In consideration of the negative magnetization,six different magnetic states are achieved by simply applying the magnetic field.The abinitio calculations and neutron diffraction measurements indicate that the studied compound is a cubic structure withferromagnetic ordering at low temperature and the evolution in magnetic states(i.e.magnetic deflagration)should arise from the Barkhausen effect.The almost unchanged magnetic state under corresponding range of magnetic field enables the magnetization to be in the same magnitude even after 50 cyclic hysteresis loops.Furthermore,the retention,repeatable switching,and non-volatile characters of multi-level magnetic state have been primely confirmed.All these suggest that the Tb_(0.95)Mn_(1.5)Co_(0.5)compound with multiple magnetic deflagrations could be applied to multiple-state magnetic memory and this work would pave the way to design a novel multi-level magnetic storage.
基金supported by the National Natural Science Foundation of China(52301240,52472274)the Fundamental Research Funds for the Provincial Universities of Zhejiang(GK259909299001-022)。
文摘The magnetic refrigeration(MR)based on the principle of magnetocaloric effect(MCE)in magnetic materials was recognized as an alternative cooling way to our present commercialized vapor compression cycle technology.Evidently,a vital prerequisite for practical applications is the exploration of candidate materials with prominent magnetocaloric performances.In this paper,the polycrystalline garnet RE_(3)Al_(5)O_(12)(RE=Tb,Dy and Ho)compounds with the cubic structure(space group:Ia3d)were prepared using the Pechini sol-gel method,and their crystal structure,magnetic properties and comprehensive magnetocaloric performances were studied.The analysis of magnetic susceptibility curves in a static magnetic field H=0.1 T reveal that the Dy_(3)Al_(5)O_(12)undergoes antiferromagnetic transition with Néel temperature TN≈2.6 K,whereas the Tb_(3)Al_(5)O_(12)and Ho_(3)Al_(5)O_(12)exhibit no features indicative of the magnetic ordering processes down to 1.8 K.The comprehensive magnetocaloric performances,namely the maximum magnetic entropy change and relative cooling power,are derived indirectly from the isothermal field-dependent magnetization data,which yield 11.72,10.42,7.53 J/(kg·K)and 84.56,69.52,70.35 J/kg for the Tb_(3)Al_(5)O_(12),Dy_(3)Al_(5)O_(12)and Ho_(3)Al_(5)O_(12)under a low field change(ΔH)of 0-2 T,respectively.The superior comprehensive magnetocaloric performances and wide operating temperature range of these compounds under lowΔH make them attractive for cryogenic MR technology.
文摘基于含硒衍生物在癌症治疗中发挥的重大作用,文中以前期合成的2-(2-苯氨甲酰基甲硫基-1,3,4-噻二唑-5-基)-1,2-苯并异硒唑-3(2H)-酮化合物(2-(2-phenylaminomethylthio-1,3,4-thiadiazol-5-yl-1),2-benziselenazol-3(2H)-one compound,PTBO)为受试药,通过体外细胞培养,结合转录组测序方法,考察该衍生物对人乳腺癌细胞(michigan cancer foundation-7,MCF-7)的基因表达的影响,分析基因表达的差异,以期为该含PTBO对肿瘤细胞的抑制作用机制的研究提供参考。结果证明,与未经处理的MCF-7细胞相比,PTBO引起基因差异表达2561个,其中差异表达基因上调1744个,差异表达基因下调817个。通过GO(geneontology)功能富集和KEGG(kyoto encyclopedia of genes and genomes)通路分析发现,PTBO会导致蛋白质分解、蛋白质的衰变等相关基因的差异表达;通过下调包括周期蛋白依赖性激酶4和6(cyclin-dependent kinase 4/6,CDK4/CDK6)等基因表达,PTBO可以调控P53信号通路和肿瘤坏死因子(tumour necrotizing factor,TNF)信号通路,并显著上调了抑癌基因(P53)、细胞周期抑制基因(P21)和死亡结构域蛋白(fas associated via death domain,FADD)的表达,从而阻止细胞周期、导致肿瘤细胞凋亡。
基金financially supported by the National Natural Science Foundation of China (No. 52004164)the Funding Program of Science and Technology Department of Liaoning Province, China (No. 2023-MSLH-249)the Funding Program of Education Department of Liaoning P rovince, China (No. LMGD2023018)。
文摘Fe–Ga sheets with large magnetostriction are required for improving the conversion efficiency under the ultra-high frequencymagnetic field. Trace Tb element doping can simultaneously improve the magnetostriction and ductility of Fe–Ga alloy. However, the im-pact of trace Tb doping on the microstructure and magnetostriction of Fe–Ga thin sheets is an open question. In this paper, the effects oftrace Tb addition on the secondary recrystallization and magnetostriction of Fe–Ga thin sheets are systematically studied by comparing thecharacteristics evolution of precipitation, texture, and nanoinclusions. The results indicate that trace Tb addition accelerates the secondaryrecrystallization of Goss texture due to the combined action of the bimodal size distributed precipitates, smaller grains, and more HEGBsin primary recrystallization. After quenching at 900℃, the magnetostriction value in 0.07 at %Tb-doped Fe_(81)Ga_(19) thin sheets increases by 30% to that of Fe_(81)Ga_(19) thin sheets. The increase in magnetostriction is attributed to the decrease in the number of Tb-rich precipitates andthe higher density of the nanometer-sized modified-D0_(3) inclusions induced by the dissolving of trace Tb elements after quenching. Theseresults demonstrate a simple and efficient approach for preparing Fe–Ga thin sheets with a large magnetostrictive coefficient by a combin-ation of trace RE element addition and conventional rolling method.
基金supported by grants from the National Natural Science Foundation of China(NSFC Nos.51972347 and 21771195).
文摘Inorganic lead-free double perovskites have the advantages of low toxicity,broadband emission,and good stability,which make them promising luminescent materials for lighting applications.However,due to the limited regulation of their self-trapped exciton emission,it is still greatly challenging to achieve white light emitting from a single double perovskite host.Herein,efficient and tunable white light is realized in Cs_(2)NalnCl_(6)∶Sb^(3+),Tb^(3+),Sm^(3+)double perovskite by controlling the ratios of the doped three ions with blue,green,and red emissions,respectively.The steady-state and transient fluorescence spectra of singly-and doubly-doped double perovskites reveal the existence of multiple energy transfer channels in the triply-doped phosphors,including from Sb^(3+)to Tb^(3+),Sb^(3+)to Sm^(3+),and Tb^(3+)to Sm^(3+).Benefiting from these channels,the color coordinates of the triply-doped phosphors can cross the whole white light area of the CIE chromaticity diagram by adjusting the ratios of the three dopants,and the maximum internal quantum yield of the white light phosphors is 66.61%.The white emission phosphors show the characteristic of being independent of excitation wavelength within 310-360 nm.Furthermore,the emission intensity at 430 K of the white light phosphor Cs_(2)NalnCl_(6)∶0.01Sb^(3+),0.65Tb^(3+),0.20Sm^(3+)remains 50% of that at room temperature.A WLED device fabricated with the phosphor and a 365 nm LED chip exhibits a high color rendering index of 90.9,correlated color temperature of 5469 K,and CIE coordinates of(0.333 and 0.328).The results indicate that the as-prepared double perovskite materials are promising candidates in the solid-state lighting field.
