Nanometer micro-porous Nix Zn (1-x )Fe2O4power was synthesized by hydrotherm al method.This is first time to apply template to the synthesis.The structure,characteristics and cry stal appearance are studied further by...Nanometer micro-porous Nix Zn (1-x )Fe2O4power was synthesized by hydrotherm al method.This is first time to apply template to the synthesis.The structure,characteristics and cry stal appearance are studied further by XRD,DSC,TEM,etc.It is found that nanome ter micro-porous crystal is well-crystallized,well-degree of dispers ion and smaller than 100nm in diameter.More over,tri-ethylamine can be used to b e a ideal template in this synthesis,and the first time it is reported in our co untry.The synthesis mechanism is also preliminary discussed in this pap er.展开更多
Complexes Cl-RuⅡ（dppe）2（Fe Cl4）·2CH2Cl2（2） and Br-RuII（dppe）2（Fe Br4）·2CH2Cl2（3） were prepared by the reaction of trans-RuII（dppe）2Cl2（1） with FeX 3（X = Cl, Br）. More interestingly, the ce...Complexes Cl-RuⅡ（dppe）2（Fe Cl4）·2CH2Cl2（2） and Br-RuII（dppe）2（Fe Br4）·2CH2Cl2（3） were prepared by the reaction of trans-RuII（dppe）2Cl2（1） with FeX 3（X = Cl, Br）. More interestingly, the central Ru atoms of RuII（dppe）-based complexes（2 and 3） define a tetragonal pyramid with five-coordination. The temperature dependence magnetic susceptibilities indicate that the xMT values of complexes 2 and 3 are almost constant at 50~300 K, and the xMT values sharply decrease with further decreasing the temperature at low temperature due to the zero-field splitting（ZFS） of high spin Fe（III） ions.展开更多
Magnetic refrigeration is a revolutionary, efficient, environmentally friendly cooling technology, which is on the threshold of commercialization. The magnetic rare earth materials are utilized as the magnetic refrige...Magnetic refrigeration is a revolutionary, efficient, environmentally friendly cooling technology, which is on the threshold of commercialization. The magnetic rare earth materials are utilized as the magnetic refrigerants in most cooling devices, and for many cooling application the Nd2Fe14B permanent magnets are employed as the source of the magnetic field. The status of the near room temperature magnetic cooling was reviewed.展开更多
文摘Nanometer micro-porous Nix Zn (1-x )Fe2O4power was synthesized by hydrotherm al method.This is first time to apply template to the synthesis.The structure,characteristics and cry stal appearance are studied further by XRD,DSC,TEM,etc.It is found that nanome ter micro-porous crystal is well-crystallized,well-degree of dispers ion and smaller than 100nm in diameter.More over,tri-ethylamine can be used to b e a ideal template in this synthesis,and the first time it is reported in our co untry.The synthesis mechanism is also preliminary discussed in this pap er.
文摘Complexes Cl-RuⅡ（dppe）2（Fe Cl4）·2CH2Cl2（2） and Br-RuII（dppe）2（Fe Br4）·2CH2Cl2（3） were prepared by the reaction of trans-RuII（dppe）2Cl2（1） with FeX 3（X = Cl, Br）. More interestingly, the central Ru atoms of RuII（dppe）-based complexes（2 and 3） define a tetragonal pyramid with five-coordination. The temperature dependence magnetic susceptibilities indicate that the xMT values of complexes 2 and 3 are almost constant at 50~300 K, and the xMT values sharply decrease with further decreasing the temperature at low temperature due to the zero-field splitting（ZFS） of high spin Fe（III） ions.
基金Project supported bythe U.S .Department of Energy ,Office of Basic Energy Sciences , Materials Science and Engineering Division and Astronautics Corporation of America , Milwaukee , Wisconsin
文摘Magnetic refrigeration is a revolutionary, efficient, environmentally friendly cooling technology, which is on the threshold of commercialization. The magnetic rare earth materials are utilized as the magnetic refrigerants in most cooling devices, and for many cooling application the Nd2Fe14B permanent magnets are employed as the source of the magnetic field. The status of the near room temperature magnetic cooling was reviewed.
