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N-烯丙基-N′-(对苯磺酸钠)硫脲在Sr^(2+)的鉴定中对干扰离子的掩蔽作用 被引量:1
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作者 马万山 刘德汞 +1 位作者 原红梅 韩姣利 《信阳师范学院学报(自然科学版)》 CAS 2002年第1期54-55,共2页
以实验为基础 ,提出了用玫瑰红酸钠试法鉴定 Sr2 +时 ,用 N-烯丙基 -N′-(对苯磺酸钠 )硫脲同时掩蔽 Ag+、Au3 +、Hg2 +三种离子对鉴定 Sr2 +离子的干扰的简便有效的方法 .
关键词 n-烯丙基-n'-(对苯磺酸钠)硫脲 离子鉴定 掩蔽作用 分析试剂 玫瑰红酸钠试法
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输运溶剂浮区法生长Bi_(2+x)Sr_(2-x)Ca_(n-1)Cu_nO_(2n+4+d)晶体
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作者 C.T.Lin(Max Planck Institute for Solid State Physics 70569 Stuttgart,Germany) 《人工晶体学报》 EI CAS CSCD 北大核心 2000年第S1期127-127,共1页
The growth of crystals of the high T c oxide superconductors has been hampe red by the complexities of the materials and their phase diagrams.The most common crys tal growth technique adopted for these oxides is the ... The growth of crystals of the high T c oxide superconductors has been hampe red by the complexities of the materials and their phase diagrams.The most common crys tal growth technique adopted for these oxides is the “flux”method,where the st arting materials are solved in a melt,which is usually formed by excess CuO and BaO or a KCl/NaCl mixture.The crystals are produced by slow cooling of the heate d solvent.This method,however,suffers from several disadvantages: (1) the crystals are contaminated with the crucible material, (2) the crystals are difficult to remove from the crucible, (3) the crystals contain flux inclusions. 展开更多
关键词 Bi 2+ x Sr 2- x Ca n -1 Cu n O 2 n+4+d crystal travelling solvent floating zone method superconductor
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铕激活的铝酸锶镁的合成及发光特性 被引量:2
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作者 刘利民 毛向辉 +1 位作者 朱小娟 彭夷安 《光谱实验室》 CAS CSCD 1998年第4期17-19,共3页
研究了二价铕激活的Sr1-nMgnAl2O4的合成、发光性质以及基质组分Sr/Mg摩尔比与荧光性质的关系,并对其余辉及衰减进行了测定。
关键词 发光特性 长余辉 铝酸锶镁 铕(Ⅱ)激活 合成
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几类矩阵方程的最小二乘解
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作者 郭洪鹏 贾利新 《河南科学》 2008年第1期12-14,共3页
研究以X∈Rn×n为未知矩阵的矩阵方程AX=B分别在Rn×n,SRn×n,SRpn×n,SARnp×n中的解及最小二乘解。
关键词 矩阵方程 SR^n×n SARp^n×n
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不同铝锶比对铝酸锶铕镝长余辉发光材料性能的影响 被引量:1
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作者 赵晓玲 郝虎在 +3 位作者 崔彩娥 黄平 李金龙 王森 《太原理工大学学报》 CAS 北大核心 2008年第4期433-435,共3页
通过高温固相法,控制不同的铝锶比,在1300℃下制得不同发光性能的铝酸锶铕镝发光材料,讨论了铝锶比对磷光体物相和发光性能的影响。XRD图表明,当铝锶比变化较大时,生成的铝酸锶磷光体物相完全不同。相分析和光谱显示,随着n(Al)/n(Sr)的... 通过高温固相法,控制不同的铝锶比,在1300℃下制得不同发光性能的铝酸锶铕镝发光材料,讨论了铝锶比对磷光体物相和发光性能的影响。XRD图表明,当铝锶比变化较大时,生成的铝酸锶磷光体物相完全不同。相分析和光谱显示,随着n(Al)/n(Sr)的降低,磷光体晶体结构对称性的降低,发射光谱的主峰位置逐渐向长波方向移动;不同铝锶比合成的磷光体都具有较好的长余辉特性,但铝锶比为0.5的磷光体的余辉性能还较差。综合分析认为,铝锶比为3.5,1.8的磷光体发射光谱对应于Eu2+离子的5d—4f跃迁,而铝锶比为0.5的发射光谱对应于Dy3+的跃迁发射。 展开更多
关键词 铝锶比 发光材料 长余辉
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Sr Isotopes and REEs Geochemistry of Anhydrites from L Vent Black Smoker Chimney, East Pacific Rise 9oN–10oN 被引量:1
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作者 Huiqiang Yao Huaiyang Zhou +1 位作者 Xiaotong Peng Gaowen He 《Journal of Earth Science》 SCIE CAS CSCD 2015年第6期920-928,共9页
High resolution sampling, for Sr isotope and REE analyses, was carried out along a transaction of L vent chimney collected from East Pacific Rise 9oN–10oN. Sr isotopes show these anhydrites are precipitated from a mi... High resolution sampling, for Sr isotope and REE analyses, was carried out along a transaction of L vent chimney collected from East Pacific Rise 9oN–10oN. Sr isotopes show these anhydrites are precipitated from a mixture between hydrothermal fluid and seawater. The calculated relative proportion of seawater and hydrothermal fluid shows that the mixing is heterogeneous on the transection of the L vent chimney. Anhydrites from the chimney show uniform chondrite-normalized REE pattern with enrichment of LREE and positive Eu anomaly. While normalized to the REE of end-member hydrothermal fluid, anhydrites also show uniform REE pattern but with negative Eu anomaly and enrichment of HREE. Combining previous studies on REEs of hydrothermal fluids from different hydrothermal systems and the hydrothermal fluid data from this region, we suggested that REE-anion complexing, rather than crystallography controlling, is the main factor that controls the REE partition behavior in the anhydrite during its precipitation from the mixture of hydrothermal fluid and seawater. 展开更多
关键词 East Pacific Rise n-10°n black smoker chimney AnHYDRITE Sr isotope REE.
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