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
Nd3＋ substituted spinel ferrites with formula MgxCd1-xNd0.03Fe1.97O4（x = 0.0.2,0.4,0.6.0.8 and 1.0）were prepared by oxalate co-precipitation method using novel microwave sintering technique. AR grade sulphates were...Nd3＋ substituted spinel ferrites with formula MgxCd1-xNd0.03Fe1.97O4（x = 0.0.2,0.4,0.6.0.8 and 1.0）were prepared by oxalate co-precipitation method using novel microwave sintering technique. AR grade sulphates were used as starting chemicals. The samples were sintered at optimized power of 70 W for10 min in a microwave oven（800 W）. The structural analysis of these samples was done by using X-ray diffraction, scanning electron microscope and Fourier transform IR techniques. The XRD analysis of the synthesized ferrite confirms the formation of cubic spinel structure of ferrite. The influence of Nd3＋substitution on various structural parameters of Mg-Cd ferrites was reported. IR study indicates the spectra contain two intense absorption bands around 600 and 400 cm^（-1） in addition with four extra bands. The magnetic properties of all ferrites were studied by using a vibration sample magnetometer.The crystallite and grain size dependant magnetic properties are observed. The composition Mg_（0.6）Cd_（0.4）Nd_（0.03）Fe_（1.97）O_4 has better magnetic properties that can be used in recording media. The fast synthesis of spinel ferrites is yielded due to use of the microwave sintering technique.展开更多
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.
文摘Nd3＋ substituted spinel ferrites with formula MgxCd1-xNd0.03Fe1.97O4（x = 0.0.2,0.4,0.6.0.8 and 1.0）were prepared by oxalate co-precipitation method using novel microwave sintering technique. AR grade sulphates were used as starting chemicals. The samples were sintered at optimized power of 70 W for10 min in a microwave oven（800 W）. The structural analysis of these samples was done by using X-ray diffraction, scanning electron microscope and Fourier transform IR techniques. The XRD analysis of the synthesized ferrite confirms the formation of cubic spinel structure of ferrite. The influence of Nd3＋substitution on various structural parameters of Mg-Cd ferrites was reported. IR study indicates the spectra contain two intense absorption bands around 600 and 400 cm^（-1） in addition with four extra bands. The magnetic properties of all ferrites were studied by using a vibration sample magnetometer.The crystallite and grain size dependant magnetic properties are observed. The composition Mg_（0.6）Cd_（0.4）Nd_（0.03）Fe_（1.97）O_4 has better magnetic properties that can be used in recording media. The fast synthesis of spinel ferrites is yielded due to use of the microwave sintering technique.
