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水热法制备的锌锰铁氧体纳米晶的离子分布、缺陷与磁性能 总被引:3,自引:0,他引:3
采用XPS及氧化还原滴定等手段确定了一种锌锰铁氧体纳米晶的离子分布式。采用XRD测定的样品晶格常数(αM—0.8431nm)与通过理论计算的结果(α=O.8393nm)十分接近。样品在350,450和700℃经过4h热处理后,离子分布数相应发生了变化:阳离子空位数e在350℃时达到最大值0.05520;晶格常数α随晶体阳离子空位数e的增加而增大,当e大于0.05时,晶格常数α的增加变缓。热处理温度不同,样品比饱和磁化强度σm相应改变,在350℃有最小值58.5Am^2/kg。理论计算与实验结果表明,样品的比饱和磁化强度σm与晶体中阳离子空位数e和次晶格上各价态的离子分布方式有关。 相似文献
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The polymeric chalcogenide [W2O2S6Cu4(NCMe)4]n (compound 1) was synthesized by the self-assembly reaction of (NHa)2(WOS3) with CuBr in MeCN in the presence of tricyclohexylphosphane (PCy3) under a purified nitrogen atmosphere using standard Schlenk techniques. It gives rise to a novel ID polymeric compound 1 with solvent MeCN coordinated to the copper atom. This situation is unprecedented in the W(Mo)/Cu/S system. The crystals were characterized by elemental analysis, IR and single-crystal X-ray crystallography. The configuration of the polymeric compound can be viewed as a helical chain which is propagated along the crystallographic c axis. The excited state absorption and refraction of compound 1 in CH3CN solution were studied by using the Z-scan technique with laser pulses of 40 ps pulse-width at a wavelength of 532 nm. The polymeric compound possesses an optical self-focusing performance. The positive nonlinear refraction is attributed to population transitions between singlet states. Compound 1 displays a strong excited-state absorption. 相似文献
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本文介绍了等离子的体合成、分类、获得及化学反应的特点,着重介绍等离子体在无机化学方面的应用并列举了大量的应用实例。 相似文献
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1 INTRODUCTIONSn-doped In2O3(ITO) is one kind of n-typesemiconductor material[1].It has excellent electro-optical properties , such as electrical conductivityand high transparency under visible light[2],andiswidely used in electronic , transparent electrode ,solar cells and electro-irradiance , especially inscreen display[3 ,4].Recently nearly half of the met-al indium has been used to prepare ITO materialsin the developed countries[5], such as Japan, A-merica ,France and so on.So the… 相似文献
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