ZnO-Sb2O3-P2O5系统玻璃的制备与性能

用熔体冷却方法制备了xSb2O3-(70-x)P2O5-30ZnO(x=0~40mol)和xSb2O3-(65-x)ZnO-35P2O5(x=0~40mol)系统无铅易熔玻璃,研究了ZnO-Sb2O3-P2O系统玻璃的形成区。采用热膨胀仪和红外光谱仪等对ZnO-Sb2O3-P2O5系统玻璃的结构及性能进行了研究和分析。结果表明,在ZnOSb2O3-P2O5系统玻璃中,Sb2O3参与网络结构。随着Sb2O3含量的增加,玻璃的软化点降低,密度和化学稳定性增加。在Sb2O3摩尔分数为35%左右时,系统玻璃的结构和性能比较优异。     

STUDY ON Na_2O-GeO_2-SiO_2-PbO GLASSES USED AS THE CLADDING MATERIALS OF HOLLOW WAVEGUIDES FOR TRANSMITTING CO_2 LASER

In this paper a new kind of mid - infrared fiber material is reported. The reflective coefficients (R) of glasses in the system Na2O - ZnO - GeO2-SiO2-PbO have been measured .the refractive index becomes less than unity at 1180 - 900cm-1 range because of the existence of anomalous dispersion. The optical losses of hollow: waveguides were calculated,the predicted losses at 940cm-1are 0. 65 and 0. 081B/ m as the inner diameter of fiber is 0. 5 and 1. 0-mm respectively. The glasses can be used as the cladding materials of hollow waveguides for transmitting CO2 laser from the measurements of characteristic temperatures , coefficient of expansion and chemical durability.     

CaO对ZnO-Sb2O3-P2O5-CaO系统玻璃结构与性能的影响

采用熔体冷却的方法制备了(30-x)ZnO-35Sb2O3-35P2O5-xCaO(x=0~12.5mol)系统玻璃,并借助红外光谱、差热曲线等对玻璃结构和性能进行了分析。结果表明,随着CaO的增加,磷酸盐玻璃的结构无明显的变化;随着CaO取代ZnO含量的不断增加,玻璃的转变温度和软化温度都有所提高,同时提高了玻璃的耐水性。由于CaO和ZnO的分子质量和摩尔体积相差不大,所以取代后磷酸盐玻璃的密度和摩尔体积有所下降但变化不大。玻璃的热膨胀系数和抗析晶能力随着CaO含量的增加都先增加后减小。     

CALCULATION OF INFRARED OPTICAL CONSTANTS FOR CO_2 LASER HOLLOW WAVEGUIDE MATERIALS

A simple method was deduced for calculat-ing Optical constant,optical loss and transmittance per meterOf hollow-core optical fiber using data analysis method,ge-ometerical optical and electromagnetic theory.The methodwas used to study the Na_2O-ZnO-GeO_2-SiO_2-PbO and Sb_3O_3sysem.The glasses have n_r<1 region.When the core diametera_0 is 0.5mm,the hollow waveguides of the Sb_2O_3-containing.glass is predicted with minimum loss of 0.8 dB/m at940cm~(-1).     

ZnO－PbO－GeO_2三元系统玻璃Raman光谱的研究

本文测定了ｘＺｎＯ·（３０－ｘ）ＰｂＯ·７ＯＧｅＯ２，１０ＺｎＯ·（１５＋ｘ）ＰｂＯ·（７５－ｘ）ＧｅＯ２，ｘＺｎＯ·３０ＰｂＯ·（７０－ｘ）ＧｅＯ２三个系列玻璃的Ｒａｍａｎ光谱，研究指出该系统以［ＺｎＯ４］和［ＧｅＯ４］共同构成三维网络，当ＧｅＯ２含量低时，ＰｂＯ亦进入玻璃网络。     

Luminescent properties of BaO-La_2O_3-B_2O_3 glasses with dopant

1　INTRODUCTIONResearcheshaveconfirmedthatonlyblueandredcomponentsofsunlightcanbeefficientlyabsorbedbychlorophyllmolecules[14 ] .Thereforealargeportionofsolarenergy ,particularlytheultravioletandgreencomponentsofsunlightcannotbeuseddirectlybygreenplants .A possiblewaytoincreasetheproduc tivityofgreenplantsistoconvertultravioletorgreencomponentofsunlightintoblueorredlight ,whichisbecomingmoreandmoreimportantwiththeincreaseofworld population .Thereisevidencethatthegreenhousemadeoftheplastic…     

基于光学电负性二元玻璃折射率和密度的研究

采用熔融法制备R2O3-B2O3（R=Bi,Sb）二元玻璃,测量二元玻璃的折射率、密度和禁带宽度,并利用二元玻璃禁带宽度Eg计算玻璃的光学电负性,再用光学电负性计算R2O3-B2O3（R=Bi,Sb）二元玻璃的2个重要参数：折射率和密度.实验结果表明,计算数值和实验数值非常接近,为R2O3-B2O3（R=Bi,Sb）二元玻璃的非线性光学材料的设计提供了一个很好的参数.     

Comparative study of oxidation ability between boron-doped diamond （BDD） and lead oxide （PbO_2） electrodes

The electrochemical oxidation capabilities of two high-performance electrodes,the boron-doped diamond film on Ti(Ti/BDD)and the lead oxide film on Ti(Ti/PbO2),were discussed.Hydroxyl radicals(·HO)generated on the electrode surface were detected by using p-nitrosodimethylaniline(RNO)as the trapping reagent.Electrochemical oxidation measurements,including the chemical oxygen demand (COD)removal and the current efficiency(CE),were carried out via the degradation ofp-nitrophenol(PNP)under the galvanostatic condition.The results indicate that an indirect reaction,which is attributed to free hydroxyl radicals with high activation,conducts on the Ti/BDD electrode,while the absorbed hydroxyl radicals generated at the Ti/PbO2 surface results in low degradation efficiency.Due to quick mineralization which combusts PNP to CO2 and H2O absolutely by the active hydroxyl radical directly,the CE obtained on the Ti/BDD electrode is much higher than that on the Ti/PbO2 electrode,notwithstanding the number of hydroxyl radicals produced on PbO2 is higher than that on the BDD surface.     

钛基二氧化铅电极的制备及在电合成4-吡啶甲酸中的应用

钛基二氧化铅电极 (Ti/PbO2 )具有较好的耐腐蚀性和导电性 ,析氧过电位高且硬度大 ,是一种理想的不溶性阳极材料。该电极由半导体中间层和电沉积的二氧化铅组成 ,经过实验获得了最佳的电极制备参数。中间层Sb2 O3 的质量分数为 15 %～ 2 5 % ,电沉积液中的添加剂NaF可使PbO2 镀层致密 ,浓度为 0 .4mg/L ,pH值为 1～2 ,电流密度为 5 0mA/cm2 。将该钛基二氧化铅电极应用到电解氧化 4-甲基吡啶合成 4-吡啶甲酸的实验中 ,以反应的转化率、电流效率和电极的腐蚀速度为依据 ,考察了电极的活性、镀层的质量和电极寿命 ,并通过极化曲线评价了电极的导电性及X -衍射光谱表征了二氧化铅的晶型为 β-PbO2     

Flame retardancy and its mechanism of polymers flame retarded by DBDPE/Sb2O3

The flammability characterization and thermal composition of polymers flame retarded by decabromodiphenylethane （DBDPE） and antimony trioxide （Sb2O3） were studied by cone calorimeter and thermogravimetry （TG）. The results show that ABS/DBDPE/Sb2O3 has the similar flammability parameters and thermal composition curves to ABS/DBDPO/Sb2O3. It suggests that DBDPE/Sb2O3 has the similar flame retardant behavior to DBDPO/Sb2O3. The heat release rate （HRR） and the effect heat combustion （EHC） curves of polymers flame retarded by DBDPE/Sb2O3 all decrease, but the mass loss rate （MLR） curve slightly increase. It shows that the decrease of HRR is not due to the increase of char formation ratio but the generation of incombustible gases. The major flame retardant mechanism of DBDPE/Sb2O3 is gas phase flame retardant mechanism. Increasing content of Sb2O3 in DBDPE/Sb2O3 can improve the flame retardant property and thermal stability of acrylonitrile butadiene styrene. Sb2O3 has a good synergistic effect with DBDPE.     

Growth of Nano-Sb2O3 on Mica Substrates and Flame Retardant Properties

In this paper, the Sb2O3 nanoparticles prepared with SbCl3 by the alky hydrolysis, processed with the surfactants, were assembled on mica substrates. The morphology and the assembled behavior of the nano-Sb2O3 on the mica were analyzed by means of TEM. The flame retardant properties of nano-Sb2O3 and Sb2O3/mica complex were studied by combustion test and thermal analysis. The results show that the Sb2O3 nanoparticles are assembled uniformly on the mica substrates. The nano-Sb2O3 was characterized with small size, narrow size distribution, uniform crystal and monodispersed particles. Compared with nano-Sb2O3, the Sb2O3/mica complexes have been achieved the same coordinated effects with Chlorinated Paraffin（CP） and excellent flame retardant properties.     

水热法制备Sb_2Se_3纳米晶

以酒石酸锑钾(K(SbO)C4H4O6.1/2H2O)和硒粉作为锑源和硒源,自制的2-十一烷基-1-二硫脲乙基咪唑啉季铵盐(SUDEI)为表面活性剂,150℃水热反应24 h,得到不同形貌的Sb2Se3纳米晶。通过透射电镜(TEM)、X射线衍射(XRD)、X射线光电子能谱仪(XPS)对Sb2Se3纳米晶进行了表征。讨论了反应条件对Sb2Se3纳米晶形貌的影响。     

含铁磷酸盐玻璃的制备及其结构研究

本工作用分析纯ＬｉＣＯ３，Ｆｅ２Ｏ３和ＮＨ４Ｈ２ＰＯ４制得了２０Ｌｉ２Ｏ－ｘＦｅ２Ｏ３－（８０－ｘ）Ｐ２Ｏ５系统玻璃，并应用红外和穆斯堡尔谱对其结构和铁的化学结合状态进行了研究。结果表明，玻璃中存在Ｆｅ（２＋）和Ｆｅ（３＋）离子，Ｆｅ（２＋）的配位数为６，而Ｆｅ（３＋）有４和６两种配位数。随Ｆｅ２Ｏ３含量的增加，Ｆｅ（２＋）／Ｆｅ比值减少，而Ｆｅ（３＋）（４配位）／Ｆｅ增加，发生［ＦｅＯ６］到［ＦｅＯ４］的配位变化，并且出现了焦磷酸盐基团的振动光谱．显然，玻璃的性质与Ｆｅ（２＋）／Ｆｅ和Ｆｅ（３＋）／Ｆｅ比值有关。     

B2O3对锂铝硅系统微晶玻璃结构性能的影响

采用差热分析(DTA),X-ray衍射分析(XRD),扫描电镜分析(SEM)等手段研究热处理制度对锂铝硅透明微晶玻璃热膨胀系数的影响。结果表明,随B2O3含量的增加,玻璃的熔化温度降低,熔化质量提高。经处理后的微晶玻璃样品,随B2O3含量的增加,透明性变差。当B2O3的含量超过3%时,出现比较严重的分相现象。微晶玻璃的主晶相为LixAlxSi1-xO2固溶体。     

含锆逆性玻璃及 TiO_2、PbO、SiO_2 的耐碱性以及氧化物耐碱性的评估

利用粉末失重法、分光光度法及原子吸收光谱法研究了含锆逆性玻璃及ＴｉＯ２、ＰｂＯ、ＳｉＯ２的耐碱性。在对比现存玻璃、氧化物耐碱性表示方法的基础上，研究得出了比较合理的评价氧化物耐碱性的指标。     

低压制备纳米Sb_2O_3粉的研究

用低压蒸发普通 Sb2 O3的方法制备出了纳米 Sb2 O3,分析了生成 Sb2 O3的热力学条件 ,对抑制 Sb2 O3的分解做了详细的理论分析 ,确定了制备纳米 Sb2 O3的温度条件和压力条件 ,证明在一定的氧分压情况下 Sb2 O3是不会分解的 ,测定了 Sb2 O3的粒度和粒度分布 ,探讨了生产可行性     

Ti基系列阳极的制备及电解染料废水实验研究

采用热氧化法制备了Ti／PbO2、Ti／SnO2-Sb2O3／PbO2、Ti／SnO2-Sb2O3／PbO2-Cu、Ti／SnO2-Sb2O3／PbO2-Ni和Ti／SnO2-Sb2O3／PbO2-Fe5种钛基系列阳极,进行电催化氧化处理模拟染料废水酸性品红溶液的实验研究,比较了不同电极的处理效率、反应速率,同时分析了酸性品红降解过程。结果表明：相对于Ti／PbO2和Ti／SnO2—Sb2O3／PbO2阳极,金属掺杂改性电极Ti／SnO2-Sb2O3／PbO2-Fe和Ti／SnO2-Sb2O3／PbO2-Ni对酸性品红有着更好的去除效率和降解速率,而Cu掺杂电极Ti／SnO2-Sb2O3／PbO2-Cu改性效果不明显。5种电极的电催化氧化过程均符合一级动力学模型。酸性品红在Ti／SnO2-Sb2O3／PbO2-Fe阳极上电催化氧化降解过程的紫外-可见光谱图表明在电流密度75mA／cm^2、电解质Na2SO4浓度12g／L的条件下,处理100mg／L的酸性品红模拟废水,60min内其特征吸收峰消失,酸性品红基本去除,但同时生成了部分小分子中间产物。     

FORMATION AND SOME PROPERTIES OF THE As_2Te_3-PbTe-XI_2(X=Pb,Hg) CHALCOHALIDE GLASSES

The As_2Te_3-based chalcogenide-halide glasses,which are strong candidates for infrared optical fibers,are studied.This paper investigates the glassforming regions of two quasi-ternary As_2Te_3-based systems.The glass-forming abilities are studied by differential thermal analysis(DTA).For the studied compositions,the glass transition temperatures (T_g) of As_2Te_3-PbTeHgI_2 glasses are higher than those of As_2Te_3-PbTe-PbI_2 glasses and As_2Te_3-HgI_2 glasses.With a wider infrared transmission range and the improvements in the thermal properties of the HgI_2 doped glasses, As_2Te_3-based glasses may lead to far-IR optical fiber development.     

助剂对Cu-ZnO-Al2O3-SiO2催化剂性质和催化性能的影响

研究了助剂MgO、TiO2、ZrO2等对CO2直接加氢合成二甲醚的Cu-ZnO-Al2O3-SiO2催化剂性质和催化性能的影响,并用XRD、XPS、H2-TPD、CO2-TPD、H2-TPR等手段进行了表征.结果表明,助剂不同程度地促进了CuO和ZnO的分散;降低了Cu-ZnO-Al2O3-SiO2催化剂的TPR还原温度;加入的助剂富集于催化剂表面,除ZrO2以外的其他助剂均降低了催化剂表面Cu原子的浓度;助剂对H2、CO2吸附中心有调变作用;活性评价结果表明,CO2的转化率与表面Cu原子的浓度和催化剂吸附氢的能力有关,ZrO2是CO2加氢制二甲醚Cu-ZnO-Al2O3-SiO2催化剂的优良助剂.     

Na2O-B2O3-SiO2系统玻璃结构驰豫的研究

采用正硅酸乙酯、硼酸、乙醇钠作为先驱体,采用的先驱体溶剂分别为乙醇、乙二醇甲醚和乙醇。用热饱和方法对样品进行处理制备大块干胶和玻璃,将处理好的凝胶玻璃进行膨胀系数曲线的测定。实验结果表明,用Sol-gel法制备的Na2O-B2O3-SiO2系统玻璃类似于熔制法得到的淬火玻璃的结构特性,内部质点无充分驰豫的条件。膨胀系数曲线为典型的熔制法淬火玻璃膨胀系数曲线。试样经过反复测试后,凝胶玻璃的膨胀系数曲线与经过退火玻璃的曲线一致。