共查询到20条相似文献,搜索用时 62 毫秒
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合成了十二种稀土锗钨钼酸根多元杂多配合物。利用元素化学分析和ICP相结合方法、IR等手段对配合物进行了初步表征。 相似文献
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合成了钴取代的硅钼钨四元多金属含氧簇合物,根据元素分析的结果及电荷平衡推算,其组成为K4H2[Co(OH2)SiMo7W4O39]·21H2O,并通过IR、UV、TG-DTA及XRD对其性质进行了表征。 相似文献
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介绍了钼和钼-铌单晶的制备原理、制备工艺及电子束区域熔炼炉组成结构。对熔炼室真空度、聚焦、原料棒化学成分、尺寸规格、熔炼速度,搅拌速度等对单品制备的影响进行了详细分析。 相似文献
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The electrochemical behaviour of copper electrode in molten NaCl-KCl-LaCl_3 has been investigated.TheLa-Cu alloy is formed at first and then the metallic lanthanum is deposited when the La~(3 )is reduced on thecopper electrode.The technological conditions of preparing La-Cu alloy by consumable cathode have been dis-cussed.The La-Cu alloy contained lanthanum over 90wt% was obtained.The composition of alloy was LaCu_2and La.The current efficiency was 85% and the recovery of lanthanum was near 90%. 相似文献
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YIN Yan-bing YANG Yu-lin FAN Rui-qing ZHU Yang-qing SUN Ji-ru 《Canadian Metallurgical Quarterly》2011,27(3)
Four new vanadium substituted Dawson-type heteropoly acids H<,7>[P<,2>Mo<,17>VO<,62>]·39H<,2>O(1), H8[P2Mo16V2O62]·41H2O(2) H9[P2Mo15V3o62]·51H2O(3)and H8[P2Mo14V4O62H2]·45H2O(4)were prepared respectively. Their structures were determined by IR and ICE. The inhibition effects of vanadium substituted Dawson-type heteropoly acids(Mo, P) on free radical polymerization of methyl methacrylate(MMA) were investigated by dilato- metry. The results show that the rate of the polymerization of MMA decreases and the inhibition effects of the four heteropoly acids reach the inhibitor performance of hydroquinone at a certain ratio. 相似文献
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nfluenza,usualycausedbyinfluenzavirus,isakindofworldwideinfectiousdiseasesthatcannotbecontroledefectivelyatpresent.Themostwid... 相似文献
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主要介绍了高锰酸钾工业生产方法,并对国内外现有的生产工艺进行了介绍和对比,通过技术对比和市场分析指出了高锰酸钾工业的发展方向。 相似文献
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The nanocrystals Er2O3 were prepared by using a combustion method with Schiff base as a chelating agent. The Er(Ⅲ) coordanation compound of Schiff base, obtained from erbium nitrate and retinal Schiff base, underwent a combustion process and voluminous ashes formed when calcimining the complex in air. Pure cubic Er2O3 nanocrystals with a diameter of 13nm were produced. The nanocrystals were homogeneous and rigid coacervation was not observed. The photoluminescence emission spectrum of the erbium (Ⅲ) oxide nanocrystals shows that it has a characteristic peak at 1.54μm, and some other shoulder peaks appear on both sides of the main peak. 相似文献
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Preparation,StructuralCharacterizationandThermalDecompositionMechanismofRareEarthSaltsof3-Nitro-1,2,4-Triazol-5-OneZhangTongl... 相似文献
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采用羟基铂酸为前驱体,通过沉淀转化工艺制备了铂担载量为20%(质量分数)的碳载铂催化剂。通过该方法制备得到的催化剂中纳米铂颗粒的粒度细小均一(约2.9 nm)、在载体上分布均匀、杂质Cl-含量少。质子交换膜燃料电池(PEMFC)单电池测试表明,该方法制备的催化剂对H2氧化的催化性能与E-TEK商品催化剂相当,最高输出功率密度达到1.34 W/cm2。 相似文献
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在923K、LiCl熔盐中,通过两电极体系直接电解还原CeO_2-5NiO、CeO_2-2.5Bi_2O_3、CeO_2-5ZnO三种混合氧化物制备相应的金属间化合物。从热力学上计算了3种混合氧化物的理论分解电压,并采用循环伏安法研究其电化学行为,验证了电解还原的可行性。结果表明,3种混合氧化物分别在3.2V被直接电解还原4h,NiO、Bi_2O_3、ZnO均能在CeO_2发生还原反应前生成对应的金属单质,然后促进CeO_2还原。得到的电解产物分别为CeNi_5/Ni、CeBi/Bi、CeZn_5/Ce_3Zn_(22)/CeZn_3。3种电解产物的微观形貌分别为絮状、堆积状和块状。 相似文献