STUDY OF SURFACE RESISTIVITY MODIFICATION IN Al_2O_3 CERAMIC IMPLANTED BY Fe~(2 )

The implanted ion range, the depth profileand the film sttucture of the implanted layer werestudied; the carrier concentration and the mobilitywere measured; the conductivity mechanism of thefilm implanted Fe into Al_2O_3 ceramic was discussed.The conclusion is that the implanted Fe~(2 ) ions moveinto Al_2O_3 lattice and replace Al~(3 ) to form subs-titution impurities so that the ion implanted lat-tice, as compared with the original one, presentsan effective negative charge which forms a negativecharge center. A vacancy is bound arround it, andan acceptor is introduced in the forbidden band.     

Fluorescence Detection for H_2PO_4~- based on Carbon Dots/Fe~(3+) Composite

A novel fluorescent probe for H_2PO_4~- was designed and fabricated based on the carbon dots/Fe~(3+) composite. The carbon dots were synthesized by an established one-pot hydrothermal method and characterized by transmission electron microscope, X-ray diffractometer, UV-Vis absorption spectrometer and fluorescence spectrophotometer. The carbon dots/Fe~(3+) composite was obtained by aqueous mixing of carbon dots and FeCl_3, and its fluorescence property was characterized by fluorescence spectrophotometer. The fluorescence of carbon dots was quenched by aqueous Fe~(3+) cations, resulting in the low fluorescence intensity of the carbon dots/Fe~(3+) composite. On the other hand, H_2PO_4~- reduced the concentration of Fe~(3+) by chemical reaction and enhanced the fluorescence of the carbon dots/Fe~(3+) composite. The Stern-Volmer equation was introduced to describe the relation between the relative fluorescence intensity of the carbon dots/Fe~(3+) composite and the concentration of H_2PO_4~-, and a fine linearity(R2=0.997) was found in the range of H_2PO_4~- concentration of 0.4-12 m M.     

Fe离子注入Al_2O_3陶瓷改变其表面电阻率的研究

本文研究了Fe离子注入Al_2O_3陶瓷的注入射程、纵向浓度分布和注入层结构,测定了注入层中的载流子浓度和迁移率,讨论了Al_2O_3陶瓷注入Fe离子其表面层的导电机理。其结论是:注入的Fe~(2-)离子进入Al_2O_3晶格,替代了Al~(3-)离子形成替位杂质。这样注入离子与原有晶格比较呈现一个有效负电荷,形成负电中心。它可以把一个空穴束缚在它的周围,在禁带引入受主能级。     

汽、水中痕量铜的测定—四(邻N—甲基烟酰胺基)苯卟啉分光光度法

本文研究了用四(邻N—甲基烟酰基)苯叶啉(TMPN_4)测定痕量铜的最适宜条件:在PH_4～5,温度为100℃时,加热10分钟反应完全。络合物的最大吸收在422nm,克分子吸光系数为2.5×10~6。铜的含量在0.0～2.5ug/2.5ml内遵守比尔定律,Fe~(3+)(8.0ppm), Fe~(2+)(8.0ppm), AI~(3+) (40.0ppm), Zn~(2+)(0.24ppm), Ca~(2+)(200ppm), Mg~(2+)(400ppm)及NaNO_3(0.1N), Na_2SO_4(0.1N),Kcl(0.1N),NaNO_2(0.1N),NaH_2PO_4(0.1N),Na_2SiO_3(0.01N)对测定不干扰,络合物中Cu(Ⅱ):TMPN_4=1:1。此法用于自来水,井水凝结水、蒸馏水中痕量铜的测定,效果良好。     

高温高压下Fe^26物态方程数值计算

本文在球元胞、中心力场、相对论Fermi统计近似下,用平均原子模型计算了任意温度和密度下热稠密物质Fe~(26)的状态方程。     

Effect of Ca~(2+) on CO_2 corrosion properties of X65 pipeline steel

The effect of Ca~(2+) on CO_2 corrosion to X65 pipeline steel was investigated in the simulated stratum water of an oil field containing different concentrations of Ca~(2+). It is found that Ca~(2+) can enhance the corrosion rate,especially in the Ca~(2+) concentration from 256 to 512 mg/L,which can be attributed to the growing grain size and loosing structure of corrosion scales with increasing Ca~(2+) concentration. X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS) investigations reveal that a complex carbonate (Fe, Ca)CO_3 forms at high Ca~(2+) concentration due to the gradual replacement of Fe~(2+) in FeCO_3 by Ca~(2+).     

Preparation and Photocatalytic Performance of Double-Shelled Hollow W_(18)O_(49)@C_3N_4@Ti_3C_2 Microspheres

C₃N₄,C₃N₄@Ti₃C₂ and W₁₈O₄₉@C₃N₄@Ti₃C₂ hollow spheres were successfully prepared by using SiO₂ template followed by gradual deposition method.The degradation of phenol solution and photolysis ability were tested to characterize its photocatalytic activity.Compared with the single-shelled C₃N₄ and C₃N₄@Ti₃     

N-羧甲基壳聚糖对Ca2+,Fe2+的络合(吸附)及光谱分析

研究N-羧甲基壳聚糖(NCMC)对Ca^2 ，Fe^2 的吸附性能，探讨了时间、pH对吸附性质的影响。结果表明NCMC对Ca^2 ，Fe^2 的络合能力随pH的升高而增大。当pH=10时NCMC对Ca^2 的最大吸附量为0．6575mmol／g；pH=6时NCMC对Fe^2 的最大吸附量为2．3920mmol／g。NCMC对Fe^2 的吸附能力大于Ca^2 ，并通过IR和UV光谱证实了NCMC与Ca^2 ，Fe^2 的络合作用。     

氧化钾对硅酸二钙和无水硫铝酸钙矿物形成的影响

目的 为研究K2O对高硅贝利特硫铝酸盐水泥主要矿物C2S和C4A3S的影响，为含有钾的低品位矿物原料生产高硅贝利特硫铝酸盐水泥奠定了基础．方法 采用f-CaO分析、热分析方法．结果 少量的K2O，降低了f-CaO的质量分数，降低了CaCO3的分解温度及矿物的合成温度．结论 适量的K2O，有利于f-CaO的吸收，降低了C2S和C4A3S矿物及C2S和C4A3S复合矿物合成温度。加速了高硅贝利特硫铝酸盐水泥矿物的形成；除K2O的作用外。复合矿物的相互作用也对这两种矿物的生成尤其是C2S的生成起了一定的促进作用．     

Si(100)上Ge_(1-x)C_x合金薄膜的CVD外延生长

用化学气相淀积生长方法,以乙烯为碳源、锗烷为锗源,在Si(100)衬底上外延生长出了C组分达3%的Ge1-xCx合金薄膜,研究表明随着生长温度和乙烯分压的提高均可导致Ge1-xCx薄膜中碳组分的增加;X射线衍射测量显示随着C组分的增加合金薄膜晶格常数不断减小,这表明外延薄膜中的C原子主要以替位式存在。红外吸收谱的测量结果显示Ge1-xCx合金的禁带宽度随着C组分的增加而线性增加,从0 67eV到0 87eV,与理论相符,说明碳的掺入有效地调节了禁带宽度。另外拉曼光谱显示Ge1-xCx合金在387cm-1出现一新峰,该峰是Ge1-xCx薄膜中的Ge在K点的双声子振动引起的。     

Eu5（PO4）3OH的粉末结构测定,计算及描述

本文对以水解法合成的Ｅｕ５（ＰＯ４）３ＯＨ的结构进行了测定及计算，计算结果表明，该物质属于六方晶系，空间群为Ｐ６３／ｍ，晶胞参数ａ０＝０．９７６４ｎｍ，ｃ０＝０．７６２７ｎｍ，Ｖ＝０．６０００ｎｍ＾３，Ｚ＝２。此外，提出了Ｅｕ５（ＰＯ４）３ＯＨ的结构模型，并对其结构进行了详细的描述。     

二乙基二硫代氨基甲酸钴[(C_5H_(10)NS_2)_3Co(Ⅲ)]的溶剂热合成、晶体结构及电化学性质

溶剂热法合成了二乙基二硫代氨基甲酸钴配合物[(C5H10NS2)3Co(Ⅲ)],并制备了其单晶。用X射线衍射法测定了晶体结构并结合晶体结构对配合物做了电化学研究。该化合物属于单斜晶系,C2/c空间群,晶胞参数a=1.417 1(3)nm,b=1.033 3(4)nm,c=1.711 4(5)nm,z=4,Dc=1.423 g.cm-3,μ=1.268 mm-1,F(000)=1 056,最终结构偏离因子R=0.032 1,ωR=0.086 4,S=1.070。     

溶剂浮选吸光光度法测定痕量钯

本文拟定了以 DDO 为捕收剂,CTMAB 为助浮剂,在 SnCl_2存在下,以石油醚+氯仿+正戊醇(v:v:v:=3:2: 5)为有机溶相,溶剂浮选吸光光度法测定痕量钯的方案.其表观摩尔吸光系数可达6.1×10~5L mol cm~(-1).大多数碱金属离子不干扰,可用来测定极稀溶液中的钯.     

8-羟基喹啉钼(VI)二氧配合物[MoO_2(C_9H_6NO)_2]的合成、晶体结构及热性能分析

通过X 射线单晶衍射,确定了化合物[MoO2 (C9H6NO)2 ]的晶体结构。化合物晶体属单斜晶系,空间群为C2/c,晶胞参数a=1 .341 6 ( 3 )nm,b= 0. 934 46 ( 19 )nm,c=1 .362 2(3)nm,β=109 .78(3)°,Z=4。该化合物通过Mo原子有一个二重对称轴。在[MoO2 (C9H6NO)2 ]的分子结构中, Mo(VI)原子处于扭曲的八面体中心,N(1)、N(1A)、O(2)、O(2A)位于八面体的赤道位置,O(1)、O(1A)位于八面体的顶点位置。从晶胞堆积图中可看到,通过C(8)—H(8A)…O(1)有一潜在的弱的氢键,使标题化合物的结构更稳定。     

红宝石与蓝宝石的色光效应分析

红宝石和蓝宝石都是刚玉类矿物,但两者色光效应有别,这是因为它们的呈色机理不同。内反射光强与内反射色是决定它们色感质量的核心;少量色素离子以类质同象方式进入矿物晶格是它们呈色的内因。红宝石是Cr~(3+)进入矿物晶格替代Al~(3+);蓝宝石则主要是Fe~(2+)和Ti~(4+)以不同比例替代晶格中的Al~(3+)。红宝石呈色是原子自身的不同轨道层内电子跃迁造成的,而蓝宝石呈色是原子间的电子跃迁造成的。     

[C3N5H4NH3]4XMo12O40(X=Si,Ge)荷移盐的合成与表征

合成了二种新型杂多酸荷移盐(C3N5H4NH3)4SiMo12O401和(C3N5H4NH3)4GeMo12O402.并用元素分析、红外光谱对其进行表征.对化合物1和2的结构分析表明,化合物中的多阴离子仍保留着其Keggin结构,但其特征振动谱带有一定的红移或蓝移.结果表明,形成电荷转移盐之后的杂多阴离子是一个独立的单元,它通过静电引力与C3N5H4NH3+作用.     

女贞子红色素的提取及其性质研究

通过酸水浸提,大孔吸附树脂吸附,对女贞子红色素进行了纯化,并对其稳定性进行了研究。结果表明,女贞子色素易溶于水和酒精,在酸性条件下稳定性良好,耐热性较好,常见金属离子如Ca2 、Ni2 、Cu2 、Mn2 、Fe2 等对其无不良影响,但氧化剂对色素的稳定性有较大影响。     

Facile Fabrication of Fe_2O_3/Nitrogen Deficient g-C_3N_(4-x) Composite Catalysts with Enhanced Photocatalytic Performances

The modification of graphitic carbon nitride can significantly improve the photocatalytic performance of graphitic carbon nitride(g-C_3N_4). Fe_2O_3/nitrogen-deficient g-C_3N_(4-x) composite catalysts were prepared with dicyandiamide as the precursor and Fe~(3+) doped in this study. The composite catalysts were characterized by XRD, SEM, FT-IR, XPS and photocurrent measurements. Close interaction occurred between Fe_2O_3 and nitrogen deficient g-C_3N_(4-x), more photogenerated electrons were created and effectively separated from the holes, resulting in a decrease of photocarrier recombination, and thus enhancing the photocurrent. Photocatalytic performance experiments showed that Fe_2O_3/nitrogen deficient g-C_3N_(4-x) could utilize lowenergy visible light more efficiently than pure g-C_3N_4, and the removal rate was 92% in 60 minutes.     

WCl_6-C_(10)H_(21)OH-Al(i-Bu)_3催化体系合成1,2—聚丁二烯的研究

本文以WCl_6—C_(10)H_(21)OH为主催化剂,Al(i-Bu)_3为助催化剂,CH_3COOC_2H_5为助溶剂,研究了CH_3COOC_2H_5的添加量和改变C_(10)H_(21)OH/WCl_6对催化活性的影响。结果表明,添加CH_3COOC_2H_5可使WCl_6在C_(10)H_(21)OH/WCl_6较低的条件下溶于加氢汽油;降低C_(10)H_(21)OH/WCl_6,聚合反应诱导期变短、适宜Al/W降低、催化活性提高,可得分子量较大、1,2—链节含量较高的聚丁二烯产物。     

Influence of Alkalis Doping on the Hydration Reactivities of Tricalcium Silicate

Influences of alkali oxides doping on the crystal structure, defects and hydration behavior of tricalcium silicate C_3S were investigated by X-ray powder diffraction with the Rietveld method, inductively coupled plasma optical emission spectroscopy, thermoluminescence and isothermal calorimetry. All the samples were stabilized as T1 form C_3S. Changes in the crystal structure of C_3S could mainly be monitored by changes in lattice parameters, which were closely correlated with the incorporation concentration and substitution types of alkalis. Although alkalis were incorporated at trace level in C_3S, the thermoluminescence and hydration behavior of C_3S were significantly influenced. Initial hydration activity was dramatically increased and highly related to the intensity of the irradiation-induced thermoluminescence peaks at low temperatures due to their direct correlation with defects. The oxygen vacancy sites resulting from the substitution of alkalis for Ca could readily account for the acceleration of the initial hydration of C_3S.