The cathode material Pr0.7Sr0.3Co1-yCuyO3-δ (y=0.05～0.3) was synthesized by a sol-gel method. X-ray diffraction indicated that the samples with y≤0.2 were single phase orthorhombic perovskite structure, but in the ...The cathode material Pr0.7Sr0.3Co1-yCuyO3-δ (y=0.05～0.3) was synthesized by a sol-gel method. X-ray diffraction indicated that the samples with y≤0.2 were single phase orthorhombic perovskite structure, but in the case of y=0.3, traces of a second phase were observed. The unit cell volumes increased with increasing copper content. The electrical conductivity decreased gradually with increasing Cu addition. The investigation of the electrochemical performance suggested that the sample with y=0.1 exhibited the lowest overpotential in all prepared Pr0.7Sr0.3Co1-yCuyO3-δ. With Pr0.7Sr0.3Co0.9Cu0.1O3-δ cathode and porous NiO/Ce0.8Sm0.2O1.9 anode, the single cell based on SDC thin film electrolyte was obtained by a simple dry pressing process. Maximum power densities of the cell were 406 and 481 mW·cm-2 at 700 and 750 ℃, respectively.展开更多
The structure, Curie temperature and magnetostriction of Pr_ 0.1Ce_ 0.6Tb_ 0.3Fe_ 1.9-xB_x compounds were investigated by means of X-ray diffraction using a Vibrating sample magnetometer and a standard strain techniqu...The structure, Curie temperature and magnetostriction of Pr_ 0.1Ce_ 0.6Tb_ 0.3Fe_ 1.9-xB_x compounds were investigated by means of X-ray diffraction using a Vibrating sample magnetometer and a standard strain technique. All the samples show entire MgCu_2-type laves phase structure. The lattice parameter decreases slightly when x≤0.1, and decreases rapidly when x>0.1 with increasing B content. Curie temperature exhibits a peak at x=0.1. The substitution of B for Fe causes the decrease of magnetostriction at room temperature.展开更多
采用快速液相烧结法制备Bi_(1-x)Pr_(x)Fe_(1-x)Ti_(x)O_(3)(x=0.00、0.03、0.06、0.12)系列多铁陶瓷样品,研究Pr-Ti共掺杂对BiFe O_(3)结构、缺陷、电学和磁学特性的影响。XRD分析结果表明:所有样品均为菱方钙钛矿结构,Pr-Ti共掺杂可...采用快速液相烧结法制备Bi_(1-x)Pr_(x)Fe_(1-x)Ti_(x)O_(3)(x=0.00、0.03、0.06、0.12)系列多铁陶瓷样品,研究Pr-Ti共掺杂对BiFe O_(3)结构、缺陷、电学和磁学特性的影响。XRD分析结果表明:所有样品均为菱方钙钛矿结构,Pr-Ti共掺杂可有效抑制杂相生成,当掺杂量高于0.06时杂相基本消失,共掺杂引起结构畸变。正电子湮没寿命谱测试结果表明:所有样品中均存在阳离子空位型缺陷,空位尺寸和浓度均随Pr-Ti掺杂量增加而增大。电学和磁学性能测试结果表明:适量Pr-Ti共掺杂可有效提高Bi Fe O_(3)的介电、铁电和磁学性能。综合上述结果,认为BiFeO_(3)多铁性能的改善可能是由于Pr-Ti共掺杂引起晶格畸变、减少氧空位浓度、改变阳离子空位浓度等多种原因引起。展开更多
Developing an effective method to synthesize high-performance high-voltage LiCoO_(2) is essential for its industrialization in lithium batteries(LIBs).This work proposes a simple mass-produced strategy for the first t...Developing an effective method to synthesize high-performance high-voltage LiCoO_(2) is essential for its industrialization in lithium batteries(LIBs).This work proposes a simple mass-produced strategy for the first time,that is,negative temperature coefficient thermosensitive Pr_(6)O_(11) nanoparticles are uniformly modified on LiCoO_(2) to prepare LiCoO_(2)@Pr_(6)O_(11)(LCO@PrO)via a liquid-phase mixing combined with annealing method.Tested at 274 mA g−1,the modified LCO@PrO electrodes deliver excellent 4.5 V high-voltage cycling performance with capacity retention ratios of 90.8%and 80.5%at 25 and 60℃,being much larger than those of 22.8%and 63.2%for bare LCO electrodes.Several effective strategies were used to clearly unveil the performance enhancement mechanism induced by Pr_(6)O_(11) modification.It is discovered that Pr_(6)O_(11) can improve interface compatibility,exhibit improved conductivity at elevated temperature,thus enhance the Li^(+)diffusion kinetics,and suppress the phase transformation of LCO and its resulting mechanical stresses.The 450 mAh LCO@PrO‖graphite pouch cells show excellent LIB performance and improved thermal safety characteristics.Importantly,the energy density of such pouch cell was increased even by~42%at 5 C.This extremely convenient technology is feasible for producing high-energy density LIBs with negligible cost increase,undoubtedly providing important academic inspiration for industrialization.展开更多
本文报道了新的含铜的氧化物的物相 Pr_(1.3)Bi_(0.1)Sr_(0.3)Ca_(0.2)Cu_2O_6的制奋、单晶结构和电磁性能.由单晶 X 射线衍射数据分析,该氧化物属四方晶系,空间群 D_(4λ)^(17)—l4/mmm.测得晶胞常数为α=3.831×10^(-10)m,c=19.64...本文报道了新的含铜的氧化物的物相 Pr_(1.3)Bi_(0.1)Sr_(0.3)Ca_(0.2)Cu_2O_6的制奋、单晶结构和电磁性能.由单晶 X 射线衍射数据分析,该氧化物属四方晶系,空间群 D_(4λ)^(17)—l4/mmm.测得晶胞常数为α=3.831×10^(-10)m,c=19.642×10^(-10)m,Z=2,V=288.3×10^(-20)m^3。在4.5—300K 温度范围内,该物相不显超导性能。经高压纯氧气氛焙烧或经纯160 Pa 氧焙烧后再经氩气氛处理的 Pr_(2-x)(Sr,Ca)_(l+2)Cu_2O_(?)(x≈0至0.4)样品也不显超导性能.展开更多
The structural and magnetic properties of Pr0.1CexTb0.9-xFe1.9 alloys were investigated by using X-ray diffraction, AC susceptibility, VSM and standard strain gauge techniques. The lattice parameter exhibits positive ...The structural and magnetic properties of Pr0.1CexTb0.9-xFe1.9 alloys were investigated by using X-ray diffraction, AC susceptibility, VSM and standard strain gauge techniques. The lattice parameter exhibits positive deviation from Vegard’s law with the increasing Ce content in the range of 0.40.6. Curie temperature decreases linearly with increasing Ce content. The saturation magnetization and magnetostriction decrease when 0.2≤x<0.4 and x>0.6, while abnormally increase with Ce content increasing from 0.4 to 0.6. These abnormal changes of （lattice） parameter, saturation magnetization and magnetostriction can be attributed to the valence fluctuation of Ce （ions.）展开更多
基金the National Natural Science Foundation of China (10674034)
文摘The cathode material Pr0.7Sr0.3Co1-yCuyO3-δ (y=0.05～0.3) was synthesized by a sol-gel method. X-ray diffraction indicated that the samples with y≤0.2 were single phase orthorhombic perovskite structure, but in the case of y=0.3, traces of a second phase were observed. The unit cell volumes increased with increasing copper content. The electrical conductivity decreased gradually with increasing Cu addition. The investigation of the electrochemical performance suggested that the sample with y=0.1 exhibited the lowest overpotential in all prepared Pr0.7Sr0.3Co1-yCuyO3-δ. With Pr0.7Sr0.3Co0.9Cu0.1O3-δ cathode and porous NiO/Ce0.8Sm0.2O1.9 anode, the single cell based on SDC thin film electrolyte was obtained by a simple dry pressing process. Maximum power densities of the cell were 406 and 481 mW·cm-2 at 700 and 750 ℃, respectively.
基金supported by the National Natural Science Foundation of China(51568068)the Young and Middle-aged Academic and Technical Leaders Reserve Talent Project(202105AC160054).
文摘The structure, Curie temperature and magnetostriction of Pr_ 0.1Ce_ 0.6Tb_ 0.3Fe_ 1.9-xB_x compounds were investigated by means of X-ray diffraction using a Vibrating sample magnetometer and a standard strain technique. All the samples show entire MgCu_2-type laves phase structure. The lattice parameter decreases slightly when x≤0.1, and decreases rapidly when x>0.1 with increasing B content. Curie temperature exhibits a peak at x=0.1. The substitution of B for Fe causes the decrease of magnetostriction at room temperature.
文摘采用快速液相烧结法制备Bi_(1-x)Pr_(x)Fe_(1-x)Ti_(x)O_(3)(x=0.00、0.03、0.06、0.12)系列多铁陶瓷样品,研究Pr-Ti共掺杂对BiFe O_(3)结构、缺陷、电学和磁学特性的影响。XRD分析结果表明:所有样品均为菱方钙钛矿结构,Pr-Ti共掺杂可有效抑制杂相生成,当掺杂量高于0.06时杂相基本消失,共掺杂引起结构畸变。正电子湮没寿命谱测试结果表明:所有样品中均存在阳离子空位型缺陷,空位尺寸和浓度均随Pr-Ti掺杂量增加而增大。电学和磁学性能测试结果表明:适量Pr-Ti共掺杂可有效提高Bi Fe O_(3)的介电、铁电和磁学性能。综合上述结果,认为BiFeO_(3)多铁性能的改善可能是由于Pr-Ti共掺杂引起晶格畸变、减少氧空位浓度、改变阳离子空位浓度等多种原因引起。
基金jointly supported by the Natural Science Foundations of China(Nos.22179020,12174057)Fujian Natural Science Foundation for Distinguished Young Scholars(Grant No.2020J06042)+2 种基金Foreign science and technology cooperation project of Fuzhou Science and Technology Bureau(No.2021-Y-086)Natural Science Foundation of Fujian Province(Grant No.2018J01660)Cultivation plan of outstanding young scientific research talents of Fujian Education Department(Grant No.J1-1323).
文摘Developing an effective method to synthesize high-performance high-voltage LiCoO_(2) is essential for its industrialization in lithium batteries(LIBs).This work proposes a simple mass-produced strategy for the first time,that is,negative temperature coefficient thermosensitive Pr_(6)O_(11) nanoparticles are uniformly modified on LiCoO_(2) to prepare LiCoO_(2)@Pr_(6)O_(11)(LCO@PrO)via a liquid-phase mixing combined with annealing method.Tested at 274 mA g−1,the modified LCO@PrO electrodes deliver excellent 4.5 V high-voltage cycling performance with capacity retention ratios of 90.8%and 80.5%at 25 and 60℃,being much larger than those of 22.8%and 63.2%for bare LCO electrodes.Several effective strategies were used to clearly unveil the performance enhancement mechanism induced by Pr_(6)O_(11) modification.It is discovered that Pr_(6)O_(11) can improve interface compatibility,exhibit improved conductivity at elevated temperature,thus enhance the Li^(+)diffusion kinetics,and suppress the phase transformation of LCO and its resulting mechanical stresses.The 450 mAh LCO@PrO‖graphite pouch cells show excellent LIB performance and improved thermal safety characteristics.Importantly,the energy density of such pouch cell was increased even by~42%at 5 C.This extremely convenient technology is feasible for producing high-energy density LIBs with negligible cost increase,undoubtedly providing important academic inspiration for industrialization.
文摘本文报道了新的含铜的氧化物的物相 Pr_(1.3)Bi_(0.1)Sr_(0.3)Ca_(0.2)Cu_2O_6的制奋、单晶结构和电磁性能.由单晶 X 射线衍射数据分析,该氧化物属四方晶系,空间群 D_(4λ)^(17)—l4/mmm.测得晶胞常数为α=3.831×10^(-10)m,c=19.642×10^(-10)m,Z=2,V=288.3×10^(-20)m^3。在4.5—300K 温度范围内,该物相不显超导性能。经高压纯氧气氛焙烧或经纯160 Pa 氧焙烧后再经氩气氛处理的 Pr_(2-x)(Sr,Ca)_(l+2)Cu_2O_(?)(x≈0至0.4)样品也不显超导性能.
基金Project(50271023) supported by the National Natural Foundation Science Foundation of China Project(02017) suppor ted by Key Foundation of Education Ministry
文摘The structural and magnetic properties of Pr0.1CexTb0.9-xFe1.9 alloys were investigated by using X-ray diffraction, AC susceptibility, VSM and standard strain gauge techniques. The lattice parameter exhibits positive deviation from Vegard’s law with the increasing Ce content in the range of 0.40.6. Curie temperature decreases linearly with increasing Ce content. The saturation magnetization and magnetostriction decrease when 0.2≤x<0.4 and x>0.6, while abnormally increase with Ce content increasing from 0.4 to 0.6. These abnormal changes of （lattice） parameter, saturation magnetization and magnetostriction can be attributed to the valence fluctuation of Ce （ions.）
