In this paper,a new rare earth benzoate coordination compound,[TbL_3(HL)(H_2O)]_2 (HL=C_7H_6O_2=benzoic acid) is synthesized and characterized by elemental analysis DTA,TG,DTC,and IR spectra.The title compound crystal...In this paper,a new rare earth benzoate coordination compound,[TbL_3(HL)(H_2O)]_2 (HL=C_7H_6O_2=benzoic acid) is synthesized and characterized by elemental analysis DTA,TG,DTC,and IR spectra.The title compound crystallizes in triclinic,space.group P with a=9.148(1),b=11.460(2), c=13.506(2);α=112.76(1),β=91.83(1),γ=91.99(1)°;Z=1;V=1303.3.The final R factor is 0.0235.The rare earth ion is nine-coordinated to form a distorted monocapped square antiprism.展开更多
Polyaniline doped with rare earth chloride was synthesized in organic solvent and identified by elemental analysis and infrared spectroscopy. The experimental results show that there exists both doping and complexatio...Polyaniline doped with rare earth chloride was synthesized in organic solvent and identified by elemental analysis and infrared spectroscopy. The experimental results show that there exists both doping and complexation at the same time in the resulting product. When pH4. Moreover, polyaniline doped with rare earth chloride exhibits better thermal stability than that doped with hydrochloric acid.展开更多
The La-Zn substituted SrM-type ferrites with the composition of Sr1-xLaxFe12-xZnxO19 （x=0-0.4） were prepared by self-propagating high-temperature synthesis （SHS）. The single SrM phase was detected by XRD in the as...The La-Zn substituted SrM-type ferrites with the composition of Sr1-xLaxFe12-xZnxO19 （x=0-0.4） were prepared by self-propagating high-temperature synthesis （SHS）. The single SrM phase was detected by XRD in the as-received samples by controlling the Fe contents in the reagents. The substitution of La^3＋and Zn^2＋ obviously increased the magnetic properties of the as-prepared samples. The maximum improvements of Br, Hcb and （BH）m were 14.4%, 15.3% and 30.7%, respectively compared with that of the samples without La-Zn substitution. Microstructure observation by SEM showed that the SHS method benefited forming the better particle features and achieving the higher Hcj in comparison with the traditional firing method.展开更多
NdCl3-FeCl3-graphite intercalation compounds were synthesized by means of molten salt-exchange method.Their layer structure and the relative content of the elements were investigated by X-ray diffraction, scanning ele...NdCl3-FeCl3-graphite intercalation compounds were synthesized by means of molten salt-exchange method.Their layer structure and the relative content of the elements were investigated by X-ray diffraction, scanning electronmicroscopy and energy dispersive X-ray spectroscopy. The results show that the products are mixtures of 2, 3,4-stages,among them, the c-axis repeat distance, Ic, of stage-3 NdCl3-GIC is 1. 6536±0. 0024 nm. In addition, the mechanismof RECl3 intercalation reaction was discussed.展开更多
Nanostructural monophase LaxBi2-xSeyTe3-y alloy was synthesized with a hydrothermal route using BiCl3, LaCl3, selenium and tellurium powders as the precursors, NaOH and disodium ethylenediaminetetraacetiate （EDTA） ...Nanostructural monophase LaxBi2-xSeyTe3-y alloy was synthesized with a hydrothermal route using BiCl3, LaCl3, selenium and tellurium powders as the precursors, NaOH and disodium ethylenediaminetetraacetiate （EDTA） as the additives. The hydrothermally synthesized powders have a petal-like morphology self-structured by the parallel side-by-side arrangement of the nano-scales. It is found that an alkaline additive is necessary for the synthesis of a monophase Bi2Te3 based alloy.展开更多
A Self-Propagating Combustion Synthesis (SPCS) method, citrate SPCS method, was used to synthesize crystalline powders of La-substituted barium hexaferrit, according to the formula Ba1-xLaxFe11.5Cr0.5O19(x=0～0.25). T...A Self-Propagating Combustion Synthesis (SPCS) method, citrate SPCS method, was used to synthesize crystalline powders of La-substituted barium hexaferrit, according to the formula Ba1-xLaxFe11.5Cr0.5O19(x=0～0.25). The structures, morphologies and ferromagnetic properties of La3+ substituted composites were characterized by powder X-Ray Diffractometer (XRD), Transmission Electron Microscope (TEM) and Vibrating Sample Magnetometer (VSM). XRD results showed that it was possible to obtain single-phase barium ferrite powders at 1100 ℃ and La content x<0.2. From the SEM, it was observed that the particles calcined at 1100 ℃ had a plate-like hexagonal shape. The results of magnetic mensuration revealed that the magnetic properties of La-substituted samples were obviously affected by La content .With the increasing of the La content, the saturation magnetization of Ba1-xLaxFe11.5Cr0.5O19 (x=0～0.25) increased from 50.1 to 56.2 emu·g-1, and coercivity increased from 1411.1 Oe to 1544.6 Oe.展开更多
文摘In this paper,a new rare earth benzoate coordination compound,[TbL_3(HL)(H_2O)]_2 (HL=C_7H_6O_2=benzoic acid) is synthesized and characterized by elemental analysis DTA,TG,DTC,and IR spectra.The title compound crystallizes in triclinic,space.group P with a=9.148(1),b=11.460(2), c=13.506(2);α=112.76(1),β=91.83(1),γ=91.99(1)°;Z=1;V=1303.3.The final R factor is 0.0235.The rare earth ion is nine-coordinated to form a distorted monocapped square antiprism.
文摘Polyaniline doped with rare earth chloride was synthesized in organic solvent and identified by elemental analysis and infrared spectroscopy. The experimental results show that there exists both doping and complexation at the same time in the resulting product. When pH4. Moreover, polyaniline doped with rare earth chloride exhibits better thermal stability than that doped with hydrochloric acid.
基金Project supported by the Key Project for Science and Technology of Zhejiang Province
文摘The La-Zn substituted SrM-type ferrites with the composition of Sr1-xLaxFe12-xZnxO19 （x=0-0.4） were prepared by self-propagating high-temperature synthesis （SHS）. The single SrM phase was detected by XRD in the as-received samples by controlling the Fe contents in the reagents. The substitution of La^3＋and Zn^2＋ obviously increased the magnetic properties of the as-prepared samples. The maximum improvements of Br, Hcb and （BH）m were 14.4%, 15.3% and 30.7%, respectively compared with that of the samples without La-Zn substitution. Microstructure observation by SEM showed that the SHS method benefited forming the better particle features and achieving the higher Hcj in comparison with the traditional firing method.
文摘NdCl3-FeCl3-graphite intercalation compounds were synthesized by means of molten salt-exchange method.Their layer structure and the relative content of the elements were investigated by X-ray diffraction, scanning electronmicroscopy and energy dispersive X-ray spectroscopy. The results show that the products are mixtures of 2, 3,4-stages,among them, the c-axis repeat distance, Ic, of stage-3 NdCl3-GIC is 1. 6536±0. 0024 nm. In addition, the mechanismof RECl3 intercalation reaction was discussed.
文摘Nanostructural monophase LaxBi2-xSeyTe3-y alloy was synthesized with a hydrothermal route using BiCl3, LaCl3, selenium and tellurium powders as the precursors, NaOH and disodium ethylenediaminetetraacetiate （EDTA） as the additives. The hydrothermally synthesized powders have a petal-like morphology self-structured by the parallel side-by-side arrangement of the nano-scales. It is found that an alkaline additive is necessary for the synthesis of a monophase Bi2Te3 based alloy.
基金the Science and Technology Key Project of Zhejiang Province (2006C21080)Zhejiang Provincial Natural Science Foundation of China (Y405038)
文摘A Self-Propagating Combustion Synthesis (SPCS) method, citrate SPCS method, was used to synthesize crystalline powders of La-substituted barium hexaferrit, according to the formula Ba1-xLaxFe11.5Cr0.5O19(x=0～0.25). The structures, morphologies and ferromagnetic properties of La3+ substituted composites were characterized by powder X-Ray Diffractometer (XRD), Transmission Electron Microscope (TEM) and Vibrating Sample Magnetometer (VSM). XRD results showed that it was possible to obtain single-phase barium ferrite powders at 1100 ℃ and La content x<0.2. From the SEM, it was observed that the particles calcined at 1100 ℃ had a plate-like hexagonal shape. The results of magnetic mensuration revealed that the magnetic properties of La-substituted samples were obviously affected by La content .With the increasing of the La content, the saturation magnetization of Ba1-xLaxFe11.5Cr0.5O19 (x=0～0.25) increased from 50.1 to 56.2 emu·g-1, and coercivity increased from 1411.1 Oe to 1544.6 Oe.
