Consideringα-RbCu_(4)Cl_(3)I_(2)is isostructural withα-RbAg4I5,in this work,we built a molecular dynamics simulation system of the former superionic conductor with an empirical pairwise potential model,which was ver...Consideringα-RbCu_(4)Cl_(3)I_(2)is isostructural withα-RbAg4I5,in this work,we built a molecular dynamics simulation system of the former superionic conductor with an empirical pairwise potential model,which was verified on the latter crystal,including long-ranging Coulomb,short-ranging Born-Mayer,charge-dipole,and dipole-quadrupole interactions.The corresponding parameters were collected from the crystal structure and several reports of interionic potentials in alkali halides.The coordination number of fixed ions was examined,and the dynamic distribution of dissociative Cu+was described by the radial distribution function.The diffusion behavior of the ions was evaluated with mean square displacements and velocity auto-correlation functions.The diffusion coefficient of copper ions obtained is(47.9±6.1)×10-7cm^(2)/s,which is approximately 37 times that of the simulation result(1.3±0.1)×10^(-7)cm^(2)/s of silver inα-RbAg4I5at room temperature.In this work,the diffusion coefficient of Cu+was first discussed by molecule simulation,while there are few experimental reports.展开更多
Copper ion conducting solid electrolyte Rb_(4)Cu_(16)I_(6.5)Cl_(13.5)was prepared by means of mechano-chemical method.The structure and morphology of the powder was investigated by x-ray diffraction and scanning elect...Copper ion conducting solid electrolyte Rb_(4)Cu_(16)I_(6.5)Cl_(13.5)was prepared by means of mechano-chemical method.The structure and morphology of the powder was investigated by x-ray diffraction and scanning electron microscopy.The grain size was estimated to be 0.2-0.9μm and the ionic conductivity at room temperature was approximately 0.206 S/cm.The solid electrolyte Rb_(4)Cu_(16)I_(6.5)Cl_(13.5)was exploited for copper ion beam generation.The copper ion emission current of several nA was successfully obtained at acceleration voltages of 15 kV and temperature of 197℃in vacuum of 2.1×10^(-4)Pa.A good linear correlation between the logarithmic ion current(logI)and the square root of the acceleration voltage(U_(acc))at high voltage range was obtained,suggesting the Schottky emission mechanism in the process of copper ion beam generation.展开更多
In this work the results of polarization researches of low-optical fiber waveguides with conservation of polarization are presented. Obtained results quite convincingly testify regarding a high sensitivity low-mode re...In this work the results of polarization researches of low-optical fiber waveguides with conservation of polarization are presented. Obtained results quite convincingly testify regarding a high sensitivity low-mode regime of work of an optical fiber to anisotropic external influences, in comparison with one-mode regime of work of the same fibre. This result, can represent a big practical value at the realization of high-sensitivity fiber-optical devices of different physical values.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.12375285 and U2430205)the China Postdoctoral Science Foundation(Grant No.2022M722439)。
文摘Consideringα-RbCu_(4)Cl_(3)I_(2)is isostructural withα-RbAg4I5,in this work,we built a molecular dynamics simulation system of the former superionic conductor with an empirical pairwise potential model,which was verified on the latter crystal,including long-ranging Coulomb,short-ranging Born-Mayer,charge-dipole,and dipole-quadrupole interactions.The corresponding parameters were collected from the crystal structure and several reports of interionic potentials in alkali halides.The coordination number of fixed ions was examined,and the dynamic distribution of dissociative Cu+was described by the radial distribution function.The diffusion behavior of the ions was evaluated with mean square displacements and velocity auto-correlation functions.The diffusion coefficient of copper ions obtained is(47.9±6.1)×10-7cm^(2)/s,which is approximately 37 times that of the simulation result(1.3±0.1)×10^(-7)cm^(2)/s of silver inα-RbAg4I5at room temperature.In this work,the diffusion coefficient of Cu+was first discussed by molecule simulation,while there are few experimental reports.
基金supported by Shenzhen Municipal Science and Technology Innovation Commission(Grant Nos.JCYJ20170818112901473 and GJHZ20200731095604015)the Department of Science and Technology of Guangdong Province,China(Grant Nos.2020A0505100059,2020A1515011531,and 2020A1515011451)by the Ministry of Education and Science of the Russian Federation in the frame of the state assignment(Grant No.FSSN-2020-0003)。
文摘Copper ion conducting solid electrolyte Rb_(4)Cu_(16)I_(6.5)Cl_(13.5)was prepared by means of mechano-chemical method.The structure and morphology of the powder was investigated by x-ray diffraction and scanning electron microscopy.The grain size was estimated to be 0.2-0.9μm and the ionic conductivity at room temperature was approximately 0.206 S/cm.The solid electrolyte Rb_(4)Cu_(16)I_(6.5)Cl_(13.5)was exploited for copper ion beam generation.The copper ion emission current of several nA was successfully obtained at acceleration voltages of 15 kV and temperature of 197℃in vacuum of 2.1×10^(-4)Pa.A good linear correlation between the logarithmic ion current(logI)and the square root of the acceleration voltage(U_(acc))at high voltage range was obtained,suggesting the Schottky emission mechanism in the process of copper ion beam generation.
文摘In this work the results of polarization researches of low-optical fiber waveguides with conservation of polarization are presented. Obtained results quite convincingly testify regarding a high sensitivity low-mode regime of work of an optical fiber to anisotropic external influences, in comparison with one-mode regime of work of the same fibre. This result, can represent a big practical value at the realization of high-sensitivity fiber-optical devices of different physical values.
