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用溶胶 凝胶法合成了Li2 xRExSi1 -xO3(RE =Pr ,Nd ,Sm ,Gd ;x =0~ 0 15 ) ,用DTA TG ,XRD ,TEM及交流阻抗等技术对样品的结构、形貌、粒径及离子导电性等进行了观察和测试。其固溶体形成范围是 0 相似文献
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Under the hydrothermal condition, the surface of sepiolite was restored with silicate and Ni was precipitated on the restored sepiolite by precipitating-reducing method. The surface of the samples was characterized by SEM, BET and XRD. The catalytic ability was examined by hydrogenation of toluene in gas phase over the silicate restored Ni/sepiolite catalyst. The experimental results show that distribution of Ni over the surface of the sample was even with bare aggregation and can be controlled, the ability of anti-aging of this catalyst was about ten times higher than that prepared by impregnation method at the same reactive condition. 相似文献
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Li4SiO4具有有利于离子传导的结构,为锂离子导体理想的基质材料[1].在硅酸盐体系中,硅的聚合态很复杂,难以得到纯相,鉴于固相法操作简单,在已有的文献中,合成方法多为固相法,但固相法不易保证成份的准确性、均匀性且合成温度较高.溶胶-凝胶法是近几年来发展起来的湿化学合成方法,用此法合成离子导体具有纯度高、均匀性好、颗粒小、反应过程易于控制等优点[2],而通常的溶胶-凝胶法是用金属醇盐与有机盐为前驱物,这样成本较高,且易造成污染.本文用金属醇盐及无机盐为前驱物,用溶胶-凝胶法合成了Li4SiO4纯相,并同一般固相法相比较,对合成的… 相似文献
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基于3,4-吡啶二羧酸配体的钆(Ⅲ)配合物的合成、晶体结构及热性质 总被引:1,自引:0,他引:1
The hydrothermal reaction of pyridine-3,4-dicarboxylic acid (pydcH2), 4,4′-bipyridine and GdCl3·6H2O yield a novel gadolinium coordination polymer {[Gd2(pydc)2(μ3-OH)2(H2O)2]·H2O}n(1). The compound was chara-cterized by elemental analysis, thermal analysis, IR spectra and single-crystal X-ray structure analysis. The crystal of the Gd(Ⅲ) complex belongs to triclinic system, space group P1 with: a=0.796 25(16) nm, b=0.944 46(19) nm, c=1.262 1(3) nm, α=76.50(3)°, β=84.95(3)°, γ=83.04(3)°, Z=2, V=0.914 4(3) nm3, Dc=2.669 g·cm-1, μ=7.269 mm-1, F(000)=692, and R1=0.033 3, wR2=0.062 3. The crystal structure revealed that compound 1 has a 2D layer structure incorporating 1D Gd-O-Gd double chain, and hydrogen bonding interactions result in the former of 3D supramolecular network structure. CCDC: 669079. 相似文献
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合成了分别带二茂钛,5-氟尿嘧啶和乙酰氧基等三种不对称自由卟啉配体和后两种配体的金属钴配合物.经元素分析,电子光谱、荧光光谱、红外光谱和核磁共振等结构表征.催化实验发现两种配合物在用分子氧氧化苯甲醛的反应中具有催化作用. 相似文献
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