ВЛИЯНИЕ СТАРЕНИЯ НА Э ЛЕКТРИЧЕСКИЕ СВОЙСТ ВА ПОЛУПРОВОДНИКОВОЙ С ИСТЕМЫ Bi2Te3-Bi2Se3

, Bi₂Te₃-Bi₂Se₃. , , , . .

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Influence of ageing on change in electrical properties of semiconducting systems of Bi₂Te₃-Bi₂Se₃

The paper describes the effect of ageing observed on a semiconducting system Bi₂Te₃ — Bi₂Se₃. It is shown that the change in electrical conductivity and thermoelectric force, which takes place during ageing, is caused by the change in concentration of the free electrons. The influence of this process on the efficiency of equipment employing the Peltier effect is analyzed.

     

Pr2O3,Sm2O3,Eu2O3及Dy2O3掺杂SrTiO3的发光光谱

SrTiO_3粉末分别用Pr_2O3、Sm_2O_3、Eu_2O_3以及Dy_2O_3掺杂处理后,以SrTiO_3能吸收的光波(≤387nm)激发后发出的荧光具有稀土离子的发光特征。     

Bi_2O_3-B_2O_3-Ga_2O_3玻璃的三阶非线性研究

采用传统熔融淬冷法制备了4组高Bi2O3含量的Bi2O3-B2O3-Ga2O3玻璃样品。测试了样品的密度、折射率和透过光谱,并分析了它们和Ga2O3含量之间的关系,拟合了样品的线性折射率随波长的变化曲线。根据Z扫描实验原理,利用钛宝石飞秒激光器测量了800 nm波长下各个样品的三阶非线性折射率n2以及非线性吸收系数β。结果表明:随着Ga2O3含量的增加,样品的线性折射率n0和三阶非线性折射率n2也随之增加,线性折射率最大样品对应的n2和β分别为3.331×10-18m2/W和0.695 cm/GW,表明该系列玻璃样品是一种优良的三阶非线性光学基质材料。     

Ga2O3组分对Tm 3+掺杂GeO2-Ga2O3-Li2O-BaO-La2O3玻璃的光谱性能影响

制备了Tm3 (8.0mol%)掺杂(77-x)GeO2-xGa2O3-8Li2O-10BaO-5La2O3(x=4,8,12,16)系列玻璃.系统地研究了Ga2O3从4mol%变化到16mol%时,玻璃的光谱性质与热学性质的变化规律.差热分析表明,随着Ga2O3含量的增加,锗酸盐玻璃的热稳定性增加.运用Judd-Ofelt(J-O)理论计算得到了Tm3 在不同Ga203含量的GeO2-Ga2O3-Li2O-BaO-La2O3玻璃中的J-O强度参数(Ω2,Ω4,Ω6)及Tm3 各激发能级的自发跃迁概率、荧光分支比以及辐射寿命等光谱参量.在808nm激光二极管的激发下,测试并分析了Ga2O3对Tm3 荧光光谱特性的影响.随着Ga2O3从4t001%增加到16mol%,Tm3 在1.8μm处的荧光强度呈现先减弱后增强的特性.当Ga2O3含量大约在12mol%时,Tm3 在1.8μm处的荧光强度最弱,受激发射截面达到最小.还初步讨论了Ga2O3对玻璃结构与光谱参数的影响规律.     

Spectroscopic properties of Er~(3+)-doped AlF_3-La_2O_3-Al_2O_3-SiO_2 glasses

Er~(3+)-doped fluoride lanthanum aluminosilicate glasses with compositions of (65-x/2)SiO_2·(25-x/2)Al_2O_3·xAlF_3·9.1La_2O_3·0.6Er_2O_3·0.3Yb_2O_3(x=4, 8, 12, 20, 30) (mol%) were prepared and their glass transition temperatures and spectroscopic properties were investigated.The Ω_2, Ω_4, and Ω_6 intensity parameters of glasses were calculated by Judd-Ofelt theory from absorption curves. It was found that glasses transition temperature and melting temperature decreased with the increase of fluoride content in glass,Ω_2 decreased gradually with the increase of AlF_3 content,but both Ω_4 and Ω_6 did not increase until AlF_3 content increased to 30 mol%.The quantum efficiency of ~4I_(13/2) to ~4I_(15/2) transition of Er~(3+) ions increases with the increase of AlF_3 content in glass.Fluorescent lifetime is longer in glass containing more AlF_3 content.     

KNO3／Al2O3和K2CO3／Al2O3的强碱性研究

采用ＣＯ２－ＴＰＤ及Ｈａｍｍｅｔｔ批示剂法测定了ＫＮＯ３／Ａｌ２Ｏ３及Ｋ２ＣＯ３／Ａｌ２Ｏ３样品的碱量和碱强度。当ＫＮＯ３，Ｋ２ＣＯ３的负载量低于其单层分散阈值时，能在ＡｌＯ３均匀分布并产生强度为１８．４的强碱位；高于其单层分散阈值后则能生成强度为２７．０的超强碱位。     

ОБ УРАВНЕНИИ БАБА ДЛЯ ЧАСТИЦЫ С НАИБОЛЬШИМ СПИНОМ 3/2

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A Note to Bhabha's equation for a particle with maximum Spin 3/2

     

Calculation of Electron-Impact 2s^2 2p^4 ^3P→2p^3 3s^3S^0 Transition in Atomic Oxygen

The inelastic scattering of electron from oxygen for the 2s^2 2p^4 ^3P→2p^3 3s^3S^0 transirion is studied using the momentum-space coupled channel optical method at 15, 17.5, 20, 22.5, 25, 27.5, 30, 50, and 100eV. Direct ionization cross sections, i.e. differential and integral cross sections, are reported. Important continuum states are included in the coupled channel calculation via a complex equivalent-local optical potential. The present results are compared with the available experimental data and other theoretical calculation results.     

对含Y_2O_3和Gd_2O_3的La_2O_3-B_2O_3-BaO玻璃化学稳定性研究

本文研究了含Ｙ２Ｏ３和Ｇｄ２Ｏ３的Ｌａ２Ｏ３－Ｂ２Ｏ３－ＢａＯ玻璃的耐水性和耐酸性。结果表明，比硅酸盐玻璃化学稳定性差的Ｌａ２Ｏ３－Ｂ２Ｏ３－ＢａＯ玻璃，可以适量的用Ｙ２Ｏ３和Ｇｄ２Ｏ３取代Ｌａ２Ｏ３，可得以改善     

Eu3+掺杂Bi2O3-TeO2-B2O3-ZnO玻璃光谱性质

测量了Eu3+（1 mol%）掺杂(60-χ)Bi2O3-χ TeO2-30B2O3-10ZnO（χ＝5,10,20,30，摩尔百分比）玻璃的吸收光谱、发射光谱、激发光谱以及声子边带谱.根据稀土离子Eu3+光学跃起矩阵元的特点，从发射光谱获得了Eu3+光学跃起的J-O参数Ω2与Ω4.结果显示,强度参量Ω2随着Bi2O3量的增加与TeO2量的减少而减小，表明材料的对称性提高， Eu-O键强减弱，共价性减弱.随着Bi2O3量的增加，电－声子偶合减弱,材料的热稳定性大幅度提高.     

3BaO·3B_2O_3·2GeO_2非晶体晶化过程的研究

3BaO·3B_2O_3·2Ge0_2是BaO-B_2O_3-GeO_2三元系中的一个三元化合物。本文用差热分析法对3BaO·3B_2O_3·2GeO_2非晶态晶化过程进行了研究,非晶的晶化温度随颗粒度减小而下降。用等温晶化法和峰值位移法测定了不同颗粒度的晶化激活能,非晶颗粒度越小,晶化激活能越大。     

Tm3+掺杂SiO2-Al2O3-PbF2-AlF3玻璃的光谱特性

用高温熔融法制备了不同Tm3 摩尔分数掺杂的摩尔分数比为0.3(SiO2)…0.1(Al2O3)…0.1(AlF3)…0.5(PbF2)…x(Tm2O3)(摩尔分数x=0.5%,1.0%,2.0%,3.0%)玻璃。从吸收光谱特性出发,应用Judd-Ofelt理论,计算得到了Tm3 的J-O强度参量(Ω2,Ω4,Ω6)及Tm3 各激发能级的自发辐射跃迁概率、荧光分支比以及辐射寿命等光谱参量。在808nm波长的激光二极管激发下,研究了不同Tm3 掺杂摩尔分数下玻璃在约1.47μm与约1.8μm处的荧光特性,在掺杂摩尔分数约达到2.0%时,在1.8μm处的荧光强度达最大,然后随着掺杂摩尔分数的增大,其荧光强度反而降低。作者从Tm3 的交叉弛豫与摩尔分数猝灭效应解释了这一荧光强度变化的规律,同时,根据McCumber理论计算了Tm3 跃迁3H6→3F4的吸收截面和跃迁3F4→3H6的受激发射截面。     

Релятивистские волн овые уравнения ддя ча стиц со спином 3/2

3/2.     

关于YBa_2Cu_3O_x-PrBa_2Cu_3O_x-YBa_2Cu_3O_x多层膜的研究

采用磁控溅射法研制了 YBa_2Cu_3O_x-PrBa_2Cu_3O_x-YBa_2Cu_3O_x 多层外延膜.上、下 YBa_2·Cu_3O_x 层的零电阻转变温度分别是80K 和82K.在77K 测量得到 PrBa_2Cu_3O_x 隔离层的电阻率约为 8×10~4Ω·cm.     

Identification of the 3s 2 3p 2 3 P 1,2 — 3s3p 3 5 S 2 0 intercombination transition in siliconlike Ni14+

The³P1, 2^{? 5}S ₂ ^o intercombination lines in Ni¹⁴⁺ have been identified in the EUV spectrum emitted by foil-excited Ni ion beams. The wavelengths are close to the theoretically predicted values. The relative intensities of the lines confirm the predicted branching ratios. In a most recent paper Ellis and Martinson [1] give predicted wavelengths and transition rates for the 3s²3p^{2 3}P_1,2 — 3s3p^{3 5}S ₂ ^o , intercombination transition in siliconlike ions with 16≤Z≤28. The data were obtained theoretically (and compared with other theoretical data by Huang [2]) but adjusted to match the known wavelengths of this transition in the first three ions of the sequence and the finestructure intervals of the³P state which are known for a few more ionization stages.     

K2O-ZnO-Al2O3-B2O3-SiO2系掺Cr3+透明莫来石微晶玻璃的研究

采用了X射线衍射、透射电镜和吸收光谱及荧光光谱技术研究了K2O－ZnO-Al2O3-B2O3－SiO2系掺Cr^3 玻璃的析晶性能和光谱。研究结果表明：在K2O－Al2O3-B2O3-SiO2系掺Cr^3 玻璃的基础上引入ZnO后，析晶性能明显改善；析晶温度降低，析出的纳米莫来石微晶均匀、规则；微晶玻璃的发光强度明显增强。     

Subsolidus phase relation in the Bi_2O_3–Fe_2O_3–La_2O_3 system

Bismuth-containing semiconductor material is a hot topic in photocatalysts because of its effective absorption under the visible light.In this paper,we expect to explore a new bismuth-based photocatalyst by studying the subsolidus phase relations of the Bi2O3–Fe2O3–La2O3system.The X-ray diffraction data shows that in this ternary system the ternary compound does not exist,while seven binary compounds(including one solid solution series Bi1 xLaxO1.5with 0.167≤x≤0.339)are obtained and eight compatibility triangles are determined.     

Ho3+掺杂GeO2-Ga2O3-Li2O-BaO-La2O3玻璃的光谱和增益特性的计算

用高温熔融法制备了不同Ho3+浓度掺杂的65GeO2-12Ga2O3-8Li2O-10BaO-5La2O3-χHo2O3锗酸盐玻璃.从吸收光谱出发,应用Judd-Ofelt理论,获得了Ho3+离子的跃迁强度参量（Ω2,Ω4,Ω6）,并由此计算了Ho3+离子的自发辐射跃迁几率A,荧光分支比β,辐射能级寿命τ等光谱参量.根据McCumber理论,计算了Ho3+离子能级5I8→5I7（2.0 μm）跃迁的吸收截面和受激发射截面,同时也获得了相应的反映粒子数反转的增益截面光谱.钬掺杂的锗酸盐玻璃,其增益截面的最大值比所报道的氟锆铝酸盐玻璃大.结果表明,Ho3+掺杂的锗酸盐玻璃在2.0 μm附近波段的中红外激光器中将有一定的应用前景.     

GeO2对Eu3+掺杂Bi2O3-B2O3-ZnO玻璃光谱性质的影响

用高温融熔法制备了Eu^3＋掺杂摩尔分数为1％的（60-X）Bi2O3-XGeO2-30B2O3-10ZnO（摩尔分数X=5,10,20,30）系统玻璃。测定了玻璃的差热分析曲线、发射光谱与激发光谱。从发射光谱与稀土Eu^3＋离子光学跃起矩阵元的特点,计算了Eu^3＋光学跃迁的参量Ω2与Ω1。结果显示强度参量Ω2与Ω4随着GeO2量的增加而增加,表明材料的对称性降低,Eu-O键强增加,共价性增加。玻璃的软化温度随GeO2组份的增加而提高。在GeO2摩尔分数达10％时．析晶起始温度与玻璃软化温度的差达最大,约146℃,表明该玻璃的热稳定性最好。