SrxBa1—xTiO3陶瓷的频域介电谱

用固相反应法制备ＳｒｘＢａ１－ｘＴｉＯ３系列陶瓷．当ｘ＝０．３０时呈现显著的驰豫相变特征．在５Ｈｚ至１ＭＨｚ范围,相对介电常数的实部ε′随频率ｆ的降低而增大．１／ε′与ｌｇｆ的关系曲线呈现折曲的２段直线．高频相对介电常数的实部ε′ｈ随ｘ的增加而增大是与顺电相的增加而对应．测量点（ε′,ε″）随频率ｆ的变化分布在复平面的一条直线上．     

一类非线性ROBIN问题解的边界层现象

本文讨论了非线性Ｒｏｂｉｎ问题εｙ″＝ｆ（ｔ,ｙ,ｙ′）,ａ〈ｔ〈ｂ,ｙ（ａ,ε）－ｐ１ｙ′（ａ,ε）＝Ａ,ｙ（ｂ,ε）＋ｐ２ｙ′（ｂ,ε）＝Ｂ在ｆｙ′ｙ′≠０的情形下解的边界层现象。     

稀土冠醚配位化合物的研究：X,IX,对苯二甲酸二（2‘,3’,9‘…

合成双冠醚化合物对苯二甲酸二（２′，３′，９′，１０′－二苯并－１′，４′，８′，１１′，１４′－五氧杂－环十六－６′－醇）酯的１５个稀土配位化合物，通过元素分析，摩尔电导，紫外光谱，红外光谱，荧光光谱和热分析等它们的组成和性质作表征。     

一类复超球上Cauchy型积分的边界性质

研究Ｃｎ中复超球上的一类Ｃａｕｃｈｙ型积分得到下面的结果：（１）如果ｆ（ｔ）在球面Ｓ上可积，ｔ０∈Ｓ，β≥０，并且｜１－ｔｔ０′｜β｜ｆ（ｔ）｜有界可测，则∫ｆ（ｔ）ｄｔ（１－ｚｔ′）ｎ≤Ｍ｜１－ｚｔ０′｜β｜ｌｎ｜１－ｚｔ０′｜｜（２）如果ｆ（ｚ）在复超球Ｂ内全纯，在Ｂ上连续，则１ｗ∫ｆ（ｔ）ｄｔ（１－ｔｔ０′）ｎ＝－１２ｆ（ｔ０）     

Stein流形上凸区域的边界性质

研究Ｃ＾ｎ空间和Ｓｔｅｉｎ流形上凸区域的边界性质,利用局部化技巧和Ｃ＾ｎ空间中凸区域的ＣｏｘｏЦｋｕｕ－Ｐｌｅｍｅｌｊ公式,定义Ｓｔｅｉｎ流形上具有Ａｉｚｅｎｂｅｒｇ核的Ｃａｕｃｈｙ型积分的奇异积分的Ｃａｕｃｈｙ主值,得到如下的Ｓｔｅｉｎ流形上凸区域的ＣｏｘｏЦＫｕｕ－Ｐｌｅｍｅｌｊ公式Ｆ＾＋（η）＝Ｖ,Ｐ∫Ｍεｆ（ε）Ｋ（η,ε）＋１／２ｆ（η）,η∈Ｍ;Ａ＾－（η）＝Ｖ．Ｐ．∫Ｍεａ（ε）＾Ｔ     

苯乙烯原子转移自由基聚合及其嵌段共聚物合成

分别采用氯乙酸甲酯,氯乙腈,氯化苄和三氯乙酸甲酯作引发剂,氯化亚铜／２,２′－联吡啶配位化合物作催化剂,进行了苯乙烯（Ｓｔ）和甲基丙烯酸甲酯（ＭＭＡ）的原子转移自由基聚合,研究了引发剂种类对聚合速率及所得聚合物的相对分子质量及其分布的影响,并考察了各种引发剂的引发效率,实验结果表明,只有当引发剂Ｃ－Ｃｌ键断裂能低于聚合物末端Ｃ－Ｃｌ键断裂能时,才能得到较好的引发效率,聚合物的相对分子质量分布也较窄     

一类奇摄动三阶时滞微分方程边值问题

在本文中,我们利用微分不等式理论研究下列奇摄动三阶ＲＦＤＥ：εｙ′″（ｔ）＝ｆ（ｔ,ｙ（ｔ）,ｙ（ｔ－τ）,ｙ′（ｔ－τ）,ｙ″（ｔ）,ε）,ｔ∈（０,１）ｙ（ｔ）＝θ（ｔ）,ｔ∈［－τ,０］,ｙ′（０）＝θ′（０）,ｙ′（１）＝Ａ｛的边值问题,证明了解的存在性,并给出了解的有效估计式．     

微波固体VCO的研究

本文研究由同轴介质（介电常数εｒ＞８０）填充均匀阻抗谐振胶制成的微波固体ＶＣＯ，其频率稳定度高达３×１０（－５），频谱纯度好，Ｓ／Ｎ＞７０ｄＢ。     

BAPHDCA与La,Sm,Yb和Zn盐的相互作用的研究

讨论Ｎ,Ｎ′－二安替比林－１,６－己二酰胺（ＢＡＰＨＤＣＡ）分别与镧、钐、镱和锌的高氯酸盐,镧的硝酸盐和氯化物等在水溶液中全浓度范围内的相互作用行为;对体系中形成的５ 个固液异组成的三元化合物：ＲＥ（ＢＡＰＨＤＣＡ）２（ＣｌＯ４）３·４Ｈ２Ｏ（ＲＥ＝ Ｌａ,Ｓｍ ,Ｙｂ）、Ｌａ（ＢＡＰＨＤＣＡ）（ＮＯ３）３·４Ｈ２Ｏ和Ｚｎ（ＢＡＰＨＤＣＡ）（ＣｌＯ４）２·２Ｈ２Ｏ的组成、可能结构、配位方式及热分解机理作了初步探讨;对形成双核化合物的可能性进行了初步讨论。     

μ—4,4′—联吡啶多核铜（Ⅱ）配合物的晶体结构

本文合成了４，４′－联吡啶为桥联配体的多核Ｃｕ（Ⅱ）配合物（Ｃｕ（ｐｈｅｎ）（μ－４，４′－ｂｐｙ）（ＣｌＯ４）２）ｎ．Ｈ２Ｏ（ｐｈｅｎ＝１，１０菲咯啉，４，４′ｂｐｙ＝４，４′联吡啶），于定温下测定了该配合物的晶体结构，Ｃｕ（Ⅱ）的配位环境是一个畸变八面体，Ｃｕ（Ⅱ）通过４，４′联吡啶连接成锯齿状的链。     

Structural, electrical, dielectric and magnetic properties of Mn-Nd substituted CoFeO3 nano sized multiferroics

A series of Mn x Co_(1-x) Fe_(1-y) Nd_yO_3(where x=0.0–1.0 y=0.0–0.1) multiferroic nanocrystals was synthesized via sol-gel auto-combustion technique. The structure was confirmed by X-ray diffraction(XRD)while morphology was investigated by scanning electron microscopy(SEM). The electrical resistivity was observed to increase from 2.14 * 10~7 to 8.77 * 10~9 Ω-cm and activation energy was found to increase from 0.64 to 0.75 e V, while the drift mobility decreased from 4.75 * 10~(-13) to 1.27 * 10~(-15)cm~2V~(-1)S~(-1) by the substitution of Mn and Nd contents. The dielectric constant, dielectric loss and dielectric loss factor decrease with frequency and Mn-Nd contents. The saturation magnetization was increased from 34 to 70 emu g~(-1) while the coercivity decreased from 705 to 262 Oe with the increase of substituents.The increase in electrical resistivity and saturation magnetization while decrease in dielectric parameters and coercivity make these nanomaterials suitable for applications in microwave devices and longitudinal magnetic recording media.     

退火气氛对SrTiO3薄膜电学性能的影响

在不同的退火气氛下,采用金属有机物分解法在(111)Pt/Ti/SiO2/Si衬底上制备了SrTiO3薄膜材料,并对其结构和电学性能进行了研究。X射线衍射结果显示SrTiO3薄膜都呈现多晶立方钙钛矿结构。对比不同气氛下制备出的SrTiO3样品电学测量结果,发现在氧气氛中退火后,样品具有较低的漏电流和较好的介电性能,这可能是由于氧气氛中退火减少了SrTiO3薄膜内氧空位的浓度引起的。     

ZnO and MnO2 Doped PbTiO3 Ceramics Prepared by Sol-gel Method

ZnO and MnO2-doped PbTiO3 nanometer powders have been prepared by using titanium butoxide (Ti(OC4H9)4) and lead acetate (Pb(Ac)2.3H2O) as starting materials, acetic acid (HAc) and methanol (CH3OH) as catalyst and solvent, respectively, and Zn(Ac)2 and Mn(NO3)2 as dopants. High density and crack-free PbTiO3 ceramics were obtained. Electrical measurement indicates that the ceramics has lower dielectric constant, dielectric loss, and especially low surrounding moisture effect.     

Effect of Zinc additive on dielectric properties of Cd–Se glassy system

Cd5Se95–xZnx(x=0, 2, 4, 6) glassy alloy has been prepared by a melt-quenching technique. Thin films were deposited by thermal coating unit on ultraclean glass substrate under a vacuum of 10–6Torr. The absence of any sharp peaks in the X-ray diffraction confirms the amorphous nature of thin films. The frequency and temperature dependence of dielectric constant and dielectric loss in the frequency range of 1 kHz to 1 MHz and in the temperature range of 290–370 K were studied. Dielectric dispersion was observed when Zinc(Zn) was incorporated into the Cd–Se system.The increase in dielectric parameter with Zn concentration may be due to increase in defect states. The DC conductivity has been reported to investigate the effect of Zn concentration on DC conduction loss. The results are interpreted in term of dipolar theory for Cd5Se95 and Cd5Se93Zn2samples, while the remaining samples have been explained on the basis of DC conduction loss. It was also observed that the DC conductivity increased with the increase of Zinc concentration, which may be due to the decrease in the band gap near Fermi level.     

与畴界有关的介电损耗、介电常数和内耗研究Ⅱ.理论部分

提出了畴界与外场、晶格及缺陷间的互作用模型以及畴界间的互作用模型,并在该模型基础上,系统地解释了与畴界运动有关的介电损耗、介电常数的和内耗(f=1KHz～10KHz)。本文还对介电损耗的理论和实验结果进行了比较     

Ferroelectric, dielectric, and optical properties of Nd-substituted Bi4Ti3O12 nanoparticles synthesized by sol-gel method

This paper reports the synthesis of neodymium substituted bismuth titanate nanoparticles(BNdT) for ferroelectric random access memory(Fe RAM) based applications using sol-gel route. X-ray diffraction pattern showed that the BNdT nanoparticles exhibited perovskite structure with orthorhombic phase. The microstructure of the BNdT nanoparticles showed that the grains were in spherical structure with a bi-modal distribution of spheres. Dielectric constant and dielectric loss of BNdT nanoparticles were measured in the frequency range 100 Hz to 100 kHz. Nd-substituted BNdT nanoparticles showed the high remanent polarization(P_r=33.2 μC/cm~2, Ec=62.5 kV/cm) than pure bismuth titanate(BT)(P_r=14.6 μC/cm~2, Ec=182.8 kV/cm) ideal for FeRAM based applications. The occurrence of red shift in photoluminescence(PL) spectrum is considered to be due to the isomerisation that may occur from the heating of samples.     

烧成条件对瓷料介电性的影响

通过对陶瓷（1－y）（Sr1-xPbxTiO3）·y（B2O3·3TiO2）（x＝0.23，y＝0．13）的烧成条件探讨，发现1250℃的烧成温度和1．5h的保温时间是最佳烧成条件．     

Size-manipulat ion, compacti on and electrical properties of barium manganite nanorods synthesized via the CHM method

A composite-hydroxide mediated method was employed to synthesize barium manganite nanorods.Diameter,surface smoothness and uniformity of these nanorods were optimized by varying reaction temperature and reaction time.The rods with an average diameter of 200 nm and length of1–1.5 μm were obtained at optimum conditions of 200 1C/48 h.The dielectric study of these rods reveals that they have higher value of dielectric constant at lower frequencies which was attributed to the interfacial and rotational type polarizations.Similarly,the increase in dielectric constant with temperature was attributed to the thermal activation of such polarizations.Furthermore,the analysis of ln(J) vs.E1/2characteristics in the temperature range of 300–400 K shows that possible operative conduction mechanism was of Poole–Frenkel type.The value of βexp was found to be 4.85 times greater than the expected theoretical value of feld lowering coeffcient with an internal feld enhancement factor ofα2 23.5.This high value of βexp may be due to some localized electric felds existing inside the sample.     

新型介质制成的粉末ACEL器件的主要光电特性

新型材料（Ｐ１９０－５３５、Ｐ２１０－７７０）具有无色透明、粘性大、耐热、抗水性能强、介电常数大、电导小等优点，用它作为粉末交流电致发光的介质，制备粉末ＡＣＥＬ器件，并测试了这种器件的Ｌ－Ｖ、Ｉ－Ｖ、Ｌ－ｆ、Ｉ－ｆ、光谱和老化等主要光电特性，证明器件的发光性能得到较大幅度的提高。     

介质阻挡放电中的表面电荷

在介质阻挡放电中,计算不同的放电间隙,气压,介电常数和介质厚度等放电条件下的表面电荷量,在VD和SD两种情况下分别进行测量,比较实验和计算结果,并讨论其机理。