The Cd puzzle implies that the phonon excitation of a spherical nucleus should be questioned and refuted.To understand the newly and experimentally discovered spherical-like γ-soft mode,the SU3-IBM was recently propo...The Cd puzzle implies that the phonon excitation of a spherical nucleus should be questioned and refuted.To understand the newly and experimentally discovered spherical-like γ-soft mode,the SU3-IBM was recently proposed In this study,the evolutions ofthe normal states in ^(108-120)Cd are investigated and compared with the experimental results.To better explain the nearly zero B(E2)values between the O_(2)^(+) and 2_(1)^(+) states,SU(3)higherorder interactions except for the SU(3)second-order and third-order Casimir operators are also considered in detail.We find that the results of theoretical fitting and experimental data agree well with simple parameter selection,and the spherical-like spectra truly exist.The deficiency may arise from the lack of configuration mixing.The realistic spectra characteristicsof thespherical-like spectrare found for ^(118,120)Cd,and the electricquadrupole moments of the 2_(1)^(+) state are predicted.The Q2_(1)^(+)anomaly in ^(108-116)Cd is also discussed.展开更多
Using low-cost FePO4·2H2O as iron source,Na2FePO4F/C composite is prepared by alcohol-assisted ball milling and solid-state reaction method.The XRD pattern of Na2FePO4F/C composite demonstrates sharp peaks,indica...Using low-cost FePO4·2H2O as iron source,Na2FePO4F/C composite is prepared by alcohol-assisted ball milling and solid-state reaction method.The XRD pattern of Na2FePO4F/C composite demonstrates sharp peaks,indicating high crystalline and phase purity.The SEM and TEM images reveal that diameter of the spherical-like Na2FePO4F/C particles ranges from 50 to 300 nm,and HRTEM image shows that the surface of Na2FePO4F/C composite is uniformly coated by carbon layer with a average thickness of about 3.6 nm.The carbon coating constrains the growth of the particles and effectively reduces the agglomeration of nanoparticles.Using lithium metal as anode,the composite delivers a discharge capacities of 102.8,96.4 and 90.3 mA·h/g at rates of 0.5C,1C and 2C,respectively.After 100 cycles at 0.5C,a discharge capacity of 98.9 mA·h/g is maintained with capacity retention of 96.2%.The Li+diffusion coefficient(D)of Na2FePO4F/C composite is calculated as 1.71×10^–9 cm^2/s.This study reveals that the simple solid state reaction could be a practical and effective synthetic route for the industrial production of Na2FePO4F/C material.展开更多
基金Supported by the Educational Department of Jilin Province,China(JJKH20210526KJ)supported by the National Natural Science Foundation of China(11875158)。
文摘The Cd puzzle implies that the phonon excitation of a spherical nucleus should be questioned and refuted.To understand the newly and experimentally discovered spherical-like γ-soft mode,the SU3-IBM was recently proposed In this study,the evolutions ofthe normal states in ^(108-120)Cd are investigated and compared with the experimental results.To better explain the nearly zero B(E2)values between the O_(2)^(+) and 2_(1)^(+) states,SU(3)higherorder interactions except for the SU(3)second-order and third-order Casimir operators are also considered in detail.We find that the results of theoretical fitting and experimental data agree well with simple parameter selection,and the spherical-like spectra truly exist.The deficiency may arise from the lack of configuration mixing.The realistic spectra characteristicsof thespherical-like spectrare found for ^(118,120)Cd,and the electricquadrupole moments of the 2_(1)^(+) state are predicted.The Q2_(1)^(+)anomaly in ^(108-116)Cd is also discussed.
基金Projects(51472211,51502256)supported by the National Natural Science Foundation of ChinaProjects(2016GK4005,2016GK4030)supported by the Strategic New Industry of Hunan Province,ChinaProject(13C925)supported by the Research Foundation of Education Bureau of Hunan Province,China
文摘Using low-cost FePO4·2H2O as iron source,Na2FePO4F/C composite is prepared by alcohol-assisted ball milling and solid-state reaction method.The XRD pattern of Na2FePO4F/C composite demonstrates sharp peaks,indicating high crystalline and phase purity.The SEM and TEM images reveal that diameter of the spherical-like Na2FePO4F/C particles ranges from 50 to 300 nm,and HRTEM image shows that the surface of Na2FePO4F/C composite is uniformly coated by carbon layer with a average thickness of about 3.6 nm.The carbon coating constrains the growth of the particles and effectively reduces the agglomeration of nanoparticles.Using lithium metal as anode,the composite delivers a discharge capacities of 102.8,96.4 and 90.3 mA·h/g at rates of 0.5C,1C and 2C,respectively.After 100 cycles at 0.5C,a discharge capacity of 98.9 mA·h/g is maintained with capacity retention of 96.2%.The Li+diffusion coefficient(D)of Na2FePO4F/C composite is calculated as 1.71×10^–9 cm^2/s.This study reveals that the simple solid state reaction could be a practical and effective synthetic route for the industrial production of Na2FePO4F/C material.
