NaH2PO2在铜电极上还原行为的研究

在铜电极上用循环伏安法研究了ＮａＨ２ＰＯ２还原的电化学行为。结果表明，ＮａＨ２ＰＯ２能在铜电极还原，其还原峰电流溶液Ｐ珠降低、ＮａＨ２ＰＯ２浓度的增加而增加。     

NaH2PO2对Zn,Zn—Fe合金电沉积的影响

用循环伏安法研究了ＮａＨ２ＯＰ２对Ｚｎ，Ｚｎ－Ｆｅ合金沉积的影响，结果表明，镀液中加入ＮａＨ２ＰＯ２后Ｚｎ，Ｚｎ－Ｆｅ合金电沉积的阴极极化增大，获得的Ｚｎ－Ｐ，Ｚｎ－Ｆｅ－Ｐ合金镀层的阳极溶解峰与Ｚｎ层相比，其峰电位正移。     

NaH_2PO_2对Zn、Zn－Fe合金电沉积的影响

用循环伏安法研究了ＮａＨ２ＰＯ２对Ｚｎ、Ｚｎ－Ｆｅ合金电沉积的影响，结果表明：镀液中加入ＮａＨ２ＰＯ２后，Ｚｎ、Ｚｎ－Ｆｅ合金电沉积的阴极极化增大；获得的Ｚｎ－Ｐ、Ｚｎ－Ｆｅ－Ｐ合金镀层的阳极溶解峰与Ｚｎ层相比，其峰电位正移。     

电镀规范对Fe—Ni—P合金硬度和耐磨性的影响

研究了不同电镀规范的Ｆｅ－Ｎｉ－Ｐ合金层显微硬度和摩擦学性能。镀液中Ｆｅ／（Ｆｅ＋Ｎｉ）浓度比增大或电流密度增加，镀层的硬度上，耐磨提高；槽液的ＰＨ值或温度增大，镀层的显微硬度下降，耐磨性降低。镀液ＮａＨ２ＰＯ２．Ｈ２Ｏ浓度为５ｇ／Ｌ时，镀层硬度和磨性最高。宜选用的工艺参数为ＰＨ值１．０－１．２，温度６０－７０℃，电流密度１０－２０Ａ／ｄｍ＾２。Ｆｅ－Ｎｉ－Ｐ非晶合金的耐磨性比Ｎｉ－Ｐ非昌合金高２     

CO2饱和高温弱酸性介质中Ni-Cu-P合金、纯Ni和A3钢的电化学行为

用线性极化法,极化曲线法和失重法研究了化学镀Ｎｉ－Ｃｕ－Ｐ非晶态合金,纯Ｎｉ和Ａ３钢于１４０℃,ｐＨ值５．０、ＣＯ２饱和的２Ｗ（ｗｔ）ＮａＳＯ４溶液中的腐蚀电化学行为,结果表明,在该介质条件下,Ｎｉ－Ｃｕ－Ｐ合金、纯Ｎｉ和Ａ３钢的耐蚀性依次减弱,比值为８１．２：２３．９：１．０。Ｎｉ－Ｃｕ－Ｐ合金于２５０￣５５０ｍＶ（ｖｓ ＯＰ）区间发生钝化;纯Ｎｉ在５０￣１５０ｍＶ和高于４００ｍＶ（ｖｓＯＰ）区     

电镀规范对Fe－Ni－P合金硬度和耐磨性的影响

研究了不同电镀规范的Ｆｅ－Ｎｉ－Ｐ合金层显微硬度和摩擦学性能。镀液中Ｆｅ／（Ｆｅ＋Ｎｉ）浓度比增大或电流密度增加，镀层的硬度上升，耐磨性提高；粮液的ｐＨ值或温度增大，镀层的显微硬度下降，耐磨性降低。镀液ＮａＨ２ＰＯ２·Ｈ２Ｏ浓度为５ｇ／Ｌ时，镀层硬度和耐磨性最高。宜选用的工艺参数为ｐＰＨ值１．０～１．２，温度６０～７０℃，电流密度１０～２０Ａ／ｄｍ２。Ｆｅ－Ｎｉ－Ｐ非晶合金的耐磨性比Ｎｉ－Ｐ非晶合金高２倍，摩擦系数低２０％。     

微波水解法制备针形α-Fe2O3纳米粒子

为了研究微波在纳米晶粒形成中的作用,用ＦｅＣｌ３溶液在微波作用下水解,并在其中掺入ＮａＨ２ＰＯ４的方法,制备了针形的α－Ｆｅ２Ｏ３纳米粒子。结果,水解速度大大提高,并且,通过测试发现,水解液的酸度、各奄分浓度的配比及微波作用时间对晶粒的结构和形貌均有重要影响。本文对微波与Ｈ２ＰＯ４＾－在形成针形纳米晶粒中的作用机制也作了阐述。     

2,4—二氯—6—羟基均三嗪钠盐的制备新方法

本文对２，４－二氯－６－羟基均三嗪盐盐的制备方法进行了改进。三氯均三嗪溶于丙酮中，在搅拌下将ＮａＨＣＯ３水溶液，慢慢滴入上述溶液中进行反应，得到的产品Ｒ值基本控制在２．０－２．１之间，有效地避免了进一步水解反应的发生。     

碳纤维表面涂碳及涂碳后纤维强度测定

用４－甲氧基苯酚经醚化、氯甲基化、消除反应合成出不熔但可溶的聚（２－甲氧基－５－辛氧基）对亚苯基亚乙烯（ＰＭＯＯＯＰＶ）。用ＰＭＯＯＯＰＶ的ＣＨＣｌ３溶液浸涂碳纤维（ＣＦ）,然后在７７３Ｋ碳化,得到亮黑色且分散性很好的涂碳ＣＦ。单纤维平均拉伸强度（σ）测定结果表明,与未涂碳的ＣＦ（σ＝２９７７．８ＭＰａ）相比较,用０．１％ＰＭＯＯＯＰＶ浸涂的ＣＦσ＝３９０８．２ＭＰａ,用０．２％ＰＭＯＯＯＰＶ浸涂的ＣＦσ＝５０３１．２ＭＰａ,并浸涂后强度离散系数、平均矢径等有规律地变小。     

PbO-PbBr2-PbF2-P2O5系统玻璃的性质

对新研制的ＰｂＯ－ＰｂＢｒ２－ＰｂＦ２－Ｐ２Ｏ５系铅卤磷权盐玻璃的化学成分以及玻璃转变温度、密度、抗潮解性和紫外光谱等性质进行了分析。结果表明,ＰｂＯ－ＰｂＢｒ２－ＰｂＦ２－Ｐ２Ｏ５系铅卤磷酸盐玻璃具有较低的玻璃转变温度,转好的抗潮解性,密度在５．０ｇ．ｃｍ＾－３以上,并且在可见了光区域具有较好的透光经。     

VLE data for CO2-CF2Cl2, N2-CO2, N2-CF2Cl2 and N2-CO2-CF2Cl

Knowledge about vapour-liquid (VLE) is required as a basis of reliable calculations for separation processes. Correlations available for the prediction of T, p, x, y data are less accurate for mixtures at high pressures and mixtures containing supercritical components. The results of VLE experiments are reported and compared with data calculated with equations of state.     

Preparation of ZrO2-CeO2 and HfO2-CeO2 nanopowders

We prepared weakly agglomerated powders of ZrO₂-CeO₂ and HfO₂-CeO₂ solid solutions 5–8 nm in particle size, consisting of monoclinic and tetragonal phases. After heat treatment at 1200°C, the crystallite size was 30 and 14 nm, respectively. We also examined the effect of precipitate freeze drying on the crystallization of hafnia-based solid solutions containing up to 20 mol % CeO₂.     

Thermal diffusion in binary mixtures H2-CCl2F2 and H2-CHClF2

Thermal diffusion coefficients were measured in two gaseous mixtures, in which one component was close to the critical temperature, in the pressure range (19.6–127.4)·10⁴ N/m² and at a freon concentration of 0.25–0.8.     

Radial GRIN glasses in Li2O-Na2O-Al2O3-TiO2-SiO2 systems

A series of GRIN glass rods have been developed in Li2O-Na2O-Al2O3-TiO2-SiO2 systems. Negative radial refractive index profiles were generated by exchanging Na+ for Li+ ions in these glass rods. It has been observed that TiO2 plays a vital role in increase in the profile depth and maximum change in the refractive index because of its ambivalent nature. Change in the refractive index can be further increased by increasing the concentration of exchanging cation in the base glass.     

Comparison of the Electronic Structures of La2CuO4, Sr2CuO2Cl2, and Sr2CuO2F2

First-principles cluster calculations are reported of the local electronic structure of the three compounds: La₂CuO₄, Sr₂CuO₂Cl₂, and Sr₂CuO₂F₂. The copper ${\text{3d}}_{x^2 - y^2 } $ and the planar oxygen 2p _σ atomic orbitals exhibit a similar degree of covalency. The out-of-plane orbitals, however, are quite different with the ${\text{3}}d_{3z^2 - r^2 } $ atomic orbital lowered significantly in energy for chlorine and fluorine apical positions.     

Thermoelectric power of single-phase samples of Tl2CaBa2Cu2O y and Ba2CaSr2Cu2O y

Single-phase 2122 samples of thallium and bismuth superconductors were made by the precursor matrix method. The thermopower of these samples was measured in the temperature range 250 K-T _c . The thermopower was positive and decreased linearly with increasing temperature aboveT _c (onset). The exponential enhancement of thermopower seen in the undoped and doped YBCO was not observed in these samples. The linear variation of thermopower can be explained on the basis of either a two-band model or a narrow band model.     

Si_2N_2O-Al_2O_3-La_2O_3和Si_2N_2O-Al_2O_3-CaO系统的亚固相关系

本文给出了 Si_2N_2O-Al_2O_3-La_2O_3和 Si_2N_2O-Al_2O_3-CaO 系统的亚固相图。实验结果表明:在 Si_2N_2O-Al_2O_3-CaO 系统中有一个未知结构的新化合物 CaO·Si_2N_2O,在3CaO·Si_2N_2O 和3CaO·Al_2O_3两化合物之间形成连续立方固溶体。而 Si_2N_2O-Al_2O_3-La_2O_3系统中则没有发现新化合物。在两个系统的富 Si_2N_2O区,过量的 Si_2N_2O 与 La_2O_3和 CaO 分别反应形成 Si_3N_4与 La_(10)[SiO_4]_(?)N_2(H-相)(和 CaSiO_3。所研究的这两个三元系统中,分别形成了如下几个四元相容性区。在 Si_2N_2O-Al_2O_3-La_2O_3系统内有:H-Si_3N_4-La_2O_3·Si_2N_2O-La_2O_3·Al_2O_3;H-Si_3N_4-La_2O_3·Al_2O_3-La_2O_3·11 Al_2O_3;H-Si_3N_4-La_2O_3·11 Al_2O_3-Al_2O_3;H-Si_3N_4-Al_2O_3-O′s.s;H-Si_3N_4-O′s.s-Si_2N_2O在 Si_2N_2O-Al_2O_3-CaO 系统内有:Si_3N_4-CaSiO_3-CaO·Si_2N_2O-3CaO·Al_2O_3;Si_3N_3-CaSiO_3-3CaO·Al_2O_3-2CaO·Al_2O_3·SiO_(?);Si_(?)N_(?)-CaSiO_3-2CaO·Al_2O_3·SiO_2-Al_2O_3;Si_3N_4-CaSiO_3-Al_2O_(?)-O′s.s;Si_3N_4-CaSiO_3-O′s.s-Si_(?)N_(?)O