The effect of Pr,Nd addition on the magnetic properties and magnetic exchange interaction of gadolinium alloys was systematically studied.Curie temperature TC and magnetic moment of Gd（1–x）REx（RE=Pr,Nd）systems wi...The effect of Pr,Nd addition on the magnetic properties and magnetic exchange interaction of gadolinium alloys was systematically studied.Curie temperature TC and magnetic moment of Gd（1–x）REx（RE=Pr,Nd）systems with x〈0.05 were investigated.When x〈0.05,Pr and Nd formed respectively with Gd continuous solid solution which has the crystalline structure HCP.Study on the magnetic behavior indicated that at near room temperature,the simple ferromagnetism prevailed in these two systems of alloy.The Curie temperature and magnetic moment of Gd（1–x）REx alloy decreased with RE（RE= Pr,Nd）content x increasing.The de Gennes factor of Gd（1–x）REx alloy which was associated with the exchange interaction between magnetic spin components also decreased with RE content increasing.The above results showed that the magnetic exchange interaction between magnetic atoms in gadolinium could be effectively changed by the Pr,Nd addition.展开更多
Li 2+ x RE x Si 1- x O 3(RE=Pr, Nd, Sm, Gd; x =0～0 15) samples were prepared by the sol gel method. DTA TG, XRD, TEM and A C impedance techniques were used to investigate the structure, sha...Li 2+ x RE x Si 1- x O 3(RE=Pr, Nd, Sm, Gd; x =0～0 15) samples were prepared by the sol gel method. DTA TG, XRD, TEM and A C impedance techniques were used to investigate the structure, shape, and ionic conductivity of these samples. The results show that the range of solid solution formation is in 0< x ≤0 09, in which the conductivity of these samples raises with the increasing amount of RE 2O 3 (RE=Pr, Nd, Sm, Gd) added, and the diameter of the powders is about 100 nm. Compared with the conventional solid state reaction, the sol gel method needs low temperature and presents high ionic conductivity.展开更多
Methodsfor the synthesis of acidic phenyl-and substituted phenylphosphonates bearing a branched long chain ester alkyl group are described.These synthetic routes are incomparably superior to other methods in vari- ous...Methodsfor the synthesis of acidic phenyl-and substituted phenylphosphonates bearing a branched long chain ester alkyl group are described.These synthetic routes are incomparably superior to other methods in vari- ous aspects including better reaction yield and higher purity of the product.The behaviour of the mono(2-butyloctyl)esters and mono(2-methyldodecyl)esters of both phenyl-and o-methylphenylphosphonic acids thus obtained in extraction of lanthanum,praseodymium,neodymium and lutecium as representatives of light and heavy rare earths,is investigated and discussed on the basis of their chemical structure.The dependence of the extraction constants and separation factors accords with the Reactivity-Selectivity Principle in solvent ex- traction proposed by us.The composition and structure of the extracted species have been characterized by infra-red and proton nuclear magnetic resonance spectroscopy in addition to elemental analyses.展开更多
基金Project supported by the Key Project of National Natural Science Foundation of China(51176050)
文摘The effect of Pr,Nd addition on the magnetic properties and magnetic exchange interaction of gadolinium alloys was systematically studied.Curie temperature TC and magnetic moment of Gd（1–x）REx（RE=Pr,Nd）systems with x〈0.05 were investigated.When x〈0.05,Pr and Nd formed respectively with Gd continuous solid solution which has the crystalline structure HCP.Study on the magnetic behavior indicated that at near room temperature,the simple ferromagnetism prevailed in these two systems of alloy.The Curie temperature and magnetic moment of Gd（1–x）REx alloy decreased with RE（RE= Pr,Nd）content x increasing.The de Gennes factor of Gd（1–x）REx alloy which was associated with the exchange interaction between magnetic spin components also decreased with RE content increasing.The above results showed that the magnetic exchange interaction between magnetic atoms in gadolinium could be effectively changed by the Pr,Nd addition.
文摘Li 2+ x RE x Si 1- x O 3(RE=Pr, Nd, Sm, Gd; x =0～0 15) samples were prepared by the sol gel method. DTA TG, XRD, TEM and A C impedance techniques were used to investigate the structure, shape, and ionic conductivity of these samples. The results show that the range of solid solution formation is in 0< x ≤0 09, in which the conductivity of these samples raises with the increasing amount of RE 2O 3 (RE=Pr, Nd, Sm, Gd) added, and the diameter of the powders is about 100 nm. Compared with the conventional solid state reaction, the sol gel method needs low temperature and presents high ionic conductivity.
基金supported by the National Natural Science Foundation of China
文摘Methodsfor the synthesis of acidic phenyl-and substituted phenylphosphonates bearing a branched long chain ester alkyl group are described.These synthetic routes are incomparably superior to other methods in vari- ous aspects including better reaction yield and higher purity of the product.The behaviour of the mono(2-butyloctyl)esters and mono(2-methyldodecyl)esters of both phenyl-and o-methylphenylphosphonic acids thus obtained in extraction of lanthanum,praseodymium,neodymium and lutecium as representatives of light and heavy rare earths,is investigated and discussed on the basis of their chemical structure.The dependence of the extraction constants and separation factors accords with the Reactivity-Selectivity Principle in solvent ex- traction proposed by us.The composition and structure of the extracted species have been characterized by infra-red and proton nuclear magnetic resonance spectroscopy in addition to elemental analyses.
