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三元二价稀土碘化物的一步合成及其性质和结构 总被引:1,自引:0,他引:1
报道了合成三元二价稀土碘化物的新方法,其优点是操作方便、省时,并避免事先合成易氧化吸水的REI_3或REI_2,特别是当某些稀土元素同时生成二价与三价稀土碘化物而不易分离时,此法最有效,用此法合成了RbTmI_3、KTmI_3、Cs_2mI_4、TISm_2I_5、K_2SmI_5和KSm_2I_4,并测定了它们的性质与结构。 相似文献
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用一步合成法对CsxRb1-xYbI3体系进行了全组成范围内的合成,采用差热分析和X射线粉末相分析法制作了相图,用体系的荧光光谱进一步验证了相图的可靠性.该体系形成一个既有包晶反应又有类低共熔反应的有限固溶体,包晶反应温度和类低共熔反应温度分别为627℃和371℃.相分析确定了RbYbI3高温相及三类固溶体的结构:0≤x≤0.5形成以RbYbI3为基的NH4CdCl3型固溶体和以RbYbI3高温相为基的CaIrO3型固溶体,0.75≤x≤1.0形成以CsYbI3为基的GdFeO3型固溶体. 相似文献
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AlO负载Pt催化剂的合成及其甲醇低温催化燃烧性能研究 《燃料化学学报》2012,40(11):1403-1408
采用一步合成法制备了Al2O3负载Pt催化剂Pt/Al2O3,以甲醇催化燃烧作为目标反应研究了其催化性能,考察了还原剂浓度、表面活性剂用量、表面活性剂浓度和煅烧温度对Pt/Al2O3甲醇低温催化燃烧性能的影响。结果表明,当还原剂浓度为0.1 mol/L、表面活性剂(CTAB)用量为8.53 g/gcat.、表面活性剂浓度为0.1 mol/L、煅烧温度为600℃时,所得催化剂的活性最高,25℃下甲醇催化燃烧的转化率达到52%。而改进一步合成法制备的负载型催化剂Pt/Al2O3具有更高的甲醇催化燃烧活性,25℃下甲醇催化燃烧的转化率为84%。 相似文献
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3-氧代硫代羧酸酯可由α-溴代酮与碲氢化钠作用形成的烯醇盐与二硫代碳酸二乙酯进行乙氧硫代羰基化反应制得,3-氧代硫代羧酸酯的烯醇含量可由核磁振谱测得。 相似文献
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用X射线粉末法确定了RbYbI3的晶体结构,并用Rietveld技术精化了结构。晶体结构属于正交晶系,a=10383(3)nm,b=04667(1)nm,c=17200(5)nm,空间群为Pnma(62),Z=4,所有原子均占据空间群Pnma的4c位置。Yb原子被I原子配位形成畸变的八面体,这些八面体共棱连接形成沿b轴的双链是RbYbI3晶体结构的特征。 相似文献
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Introduction CsEuF_3, CsYbF_3 and RbYbF_3 are the first members of divalent rare earth ternary halides obtained via reduction of trivalent rare earth halides by alkali metals. Recently we adopted a new synthesis route in preparing divalent rare earth chlorides and bromides and the five titled compounds were suc- 相似文献
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The compounds SrUI6, EuUI6 and BaUl6 are synthesized for the first time. Their crystal structures are isotypic, and they can be described as ordered substitution variants of the AlCl3 type. 相似文献
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Synthesis and Crystal Structure of Bi2ErO4I Bi2ErO4I was prepared by solid‐state reaction of stoichiometric mixture of BiOI, Bi2O3 and Er2O3. Bi2ErO4I is a new compound and the first bismuth rare earth oxide iodide. The crystal structure was determined by the Rietveldmethod (P4/mmm, a = 3,8896(6) Å, c = 9,554(2) Å, Z = 1). In this structure [M3O4]+‐layers are interleaved by single I–‐layers. Er and Bi atoms of Bi2ErO4I are 8‐coordinated. The structure can be derived from the LiBi3O4Cl2‐structure type. 相似文献
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Four new ternary rare earth complexes RE(NTA)2AA (RE=Sm3+, Eu3+, Tb3+, Dy3+) have been synthesized by the reaction of rare earth chloride(RECl3·6H2O) with Acrylic Acid (HAA) and 4,4,4-trifluoro-1-(3-pyridyl)-1,3-butanedione(NTA) in alcohol. The copolymerization of the complexes RE(NTA)2AA (RE=Sm3+, Eu3+) with methyl methacrylate (MMA) has been studied by 2, 2-azobis-isobutyronitrile as an initiator. Influence of adding Eu(Ⅲ) and 2,2′-bipyridine(bipy) into copolymer Eu(NTA)2AA-co-MMA on fluorescence property of the Eu copolymer was investigated. The compositions of the complexes and copolymer were characterized by means of elemental analysis and FTIR. The heat decomposing behaviors of the complexes were determined by TG-DTA. The glass transition temperature and molecular weight were obtained by DSC and GPC. The results of fluorescence properties show that the Eu, Sm complexes and Eu copolymer can efficiently emit fluorescence, but the Tb and Dy complexes only emit the fluorescence of β-diketone ligand. 相似文献
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二价稀土(Sm,Eu,Yb)与3-苯基-5-(呋喃-2)吡唑啉二硫代甲酸固态配合物的制备 总被引:1,自引:0,他引:1
本文首次制得了二价稀土与含硫有机配体的固态配合物RE(SSCNC13H11NO)2·xH2O(RE=Sm,Eu,Yb,x=3,4),研究了它们的性质,并对二价及相应的三价稀土配合物在物理化学性质上的差异进行了探讨。 相似文献