The temperature field in MgO single crystal furnace is crucial to grow high-purity MgO single crystals with large sizes. In order to build proper temperature gradient, firstly finite element method （FEM） was used to...The temperature field in MgO single crystal furnace is crucial to grow high-purity MgO single crystals with large sizes. In order to build proper temperature gradient, firstly finite element method （FEM） was used to study the temperature field distributions, and then a temperature controller with adaptive neuro- fuzzy inference system （ANFIS） was developed based on the result of FEM and practical experiences. When the temperature in MgO single crystal furnace was changed, the controller would regulate the positions of three- phase electrodes and the voltage of the power simultaneously. The experimental results indicate that using the adaptive neuro-fuzzy control system can improve the quality and the quantity of the MgO single crystal production.展开更多
Dichloro[1,2-bis(diphenylphosphino)ethane]nickel^(2+(NiCl2(dppe))is an organic compound containing C_(26)H_(24)P_(2)(dppe)molecules and Cl^(-),Ni^(2+ions.The large-size NiCl_(2)(dppe)single crystals with longest dimen...Dichloro[1,2-bis(diphenylphosphino)ethane]nickel^(2+(NiCl2(dppe))is an organic compound containing C_(26)H_(24)P_(2)(dppe)molecules and Cl^(-),Ni^(2+ions.The large-size NiCl_(2)(dppe)single crystals with longest dimension of 4 mm were grown by the method of slow evaporation of organic solution.Single crystal x-ray diffraction spectrum indicates that the single crystal is of high quality.Magnetization results of the NiCl_(2)(dppe)single crystals show an anisotropic paramagnetism behavior and diamagnetic background,which come from Ni^(2+ions and benzene ring,respectively.However,according to the specific heat results with temperature down to 0.1 K and magnetic field up to 14 T,no expected field-induced quantum phase transition was observed in NiCl_(2)(dppe)single crystals.展开更多
The article considers one of the possible approaches to the solution of an urgent issue of metal consumption reduction, increase of operating life and maximum operating temperature as well as reduction of irrecoverabl...The article considers one of the possible approaches to the solution of an urgent issue of metal consumption reduction, increase of operating life and maximum operating temperature as well as reduction of irrecoverable losses of platinum products and alloys when operating under high temperature conditions, particularly for glassblowing and single crystal growing crucibles. A two-layered composite material based on platinum-group metals and corundum plasma ceramics is thoroughly investigated. A successful experience of crucibles exploitation, designed for production of high temperature optical glasses from the composite and results of the research on composite material specimens are described.展开更多
基金Funded by the National High-Tech R&D Program(Nos.2008AA03A325, 2011AA06103)
文摘The temperature field in MgO single crystal furnace is crucial to grow high-purity MgO single crystals with large sizes. In order to build proper temperature gradient, firstly finite element method （FEM） was used to study the temperature field distributions, and then a temperature controller with adaptive neuro- fuzzy inference system （ANFIS） was developed based on the result of FEM and practical experiences. When the temperature in MgO single crystal furnace was changed, the controller would regulate the positions of three- phase electrodes and the voltage of the power simultaneously. The experimental results indicate that using the adaptive neuro-fuzzy control system can improve the quality and the quantity of the MgO single crystal production.
基金Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0403502)the National Natural Science Foundation of China+1 种基金Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2017483)supported by the High Magnetic Field Laboratory of Anhui Province,China
文摘Dichloro[1,2-bis(diphenylphosphino)ethane]nickel^(2+(NiCl2(dppe))is an organic compound containing C_(26)H_(24)P_(2)(dppe)molecules and Cl^(-),Ni^(2+ions.The large-size NiCl_(2)(dppe)single crystals with longest dimension of 4 mm were grown by the method of slow evaporation of organic solution.Single crystal x-ray diffraction spectrum indicates that the single crystal is of high quality.Magnetization results of the NiCl_(2)(dppe)single crystals show an anisotropic paramagnetism behavior and diamagnetic background,which come from Ni^(2+ions and benzene ring,respectively.However,according to the specific heat results with temperature down to 0.1 K and magnetic field up to 14 T,no expected field-induced quantum phase transition was observed in NiCl_(2)(dppe)single crystals.
文摘The article considers one of the possible approaches to the solution of an urgent issue of metal consumption reduction, increase of operating life and maximum operating temperature as well as reduction of irrecoverable losses of platinum products and alloys when operating under high temperature conditions, particularly for glassblowing and single crystal growing crucibles. A two-layered composite material based on platinum-group metals and corundum plasma ceramics is thoroughly investigated. A successful experience of crucibles exploitation, designed for production of high temperature optical glasses from the composite and results of the research on composite material specimens are described.
