La_2O_3施主掺杂(MgCoNi)O系氧敏材料的高温缺陷化学分析

讨论了少量Ｌａ２Ｏ３施主掺杂的（ＭｇＣｏＮｉ）Ｏ系样品在不同测试温度下的电导与氧分压关系．实验发现，施主杂质有两方面的作用：当施主含量较低时，以缺位补偿为主；另一方面，施主含量较高时，电子补偿占优，随着施主含量的增加，由缺位补偿向电子补偿过渡，用阳离子缺位扩散控制机制解释了施主杂质对晶粒生长的影响     

La2O3施主掺杂（MgCoNi）O系氧敏材料的高温缺陷化…

讨论了少量Ｌａ２Ｏ３施主掺杂的（ＭｇＣｏＮｉ）Ｏ系样品在不同测试温度下的电导与氧分压关系。实验发现，施主杂质有两方面的作用：当施主含量较低时，以缺位补偿为主；另一方面，施主含量较高时，电子补偿占优，随着施主含量的增加，由缺位补偿向电子补偿过渡，用阳离子缺位扩散控制机制解释了施主杂质对晶粒生长的影响。     

NiO替位掺杂对（Mg_xCo_（1－x））O系材料的影响

用ＮｉＯ替位掺杂对（Ｍｇ＿ｘＣｏ＿（１－ｘ））Ｏ系氧敏材料的性能进行了研究，通过测量样品在不同氧分压条件下的高温平衡电导，以及用ＸＲＤ，ＳＥＭ，差热分析等手段对样品进行了分析。实验发现替位掺杂的ＮｉＯ强烈地影响材料的稳定性、缺陷结构及微观结构等．     

掺SrLi1／4Nb3／4O3的SrTiO3氧敏材料特性的研究

利用Ｈ２／Ｈ２Ｏ体系控制氧分压，采用四电极法测量了掺杂ＳｒＬｉ１／４Ｎｂ３／４Ｏ３的ＳｒＴｉＯ３瓷体在８００～１２００℃，ＰＯ２＝１０－１５～１０５Ｐａ下的电导率，当ｐ＜１００Ｐａ，σ∝Ｐ－１／８Ｏ２；ｐＯ２≥１００Ｐａ，电导率随ｐＯ２变化较为平缓．从缺陷化学角度探讨了ＳｒＴｉＯ３系材料的氧敏性能     

ZrO_2－Tb_2O_（3．5）－Y_2O_3氧化物体系的混合导电性和氧渗透

以电化学方法研究了ＺｒＯ２－Ｔｂ２Ｏ３．５－Ｙ２Ｏ３复合氧化物体系的混合电导和氧渗透性，并从固体缺陷化学的角度进行了讨论．结果表明，在所研究的组成范围内（Ｔｂ含量高达５０ｍｏｌ％），试样皆为面心立方萤石结构，其晶格常数随Ｔｂ含量增多而线性增大．Ｔｂ元素的变价及其随温度和组成的依赖关系决定了体系的混合电导性质．Ｔｂ含量的增多导致电子电导的增大，而Ｙ的掺入对其电性质的改善不明显．氧渗透性决定于材料电子电导和离子电导的综合作用，氧渗透通量较ＺｒＯ２－Ｙ２Ｏ３体系提高了１～２个量级．氧渗透过程机制遵循氧离子和电子空穴通过材料膜的体扩散为控制步骤这一模型．     

掺杂ZrO2对Laβ—Al2O3固体电解质的性能影响

研究了掺杂不同量的ＺｒＯ２对Ｌａβ－Ａｌ２Ｏ３固体电解质的电导和抗热震性能的影响,结果表明ＺｒＯ２的加入导致电导率下降,抗热震性能提高,为此,以加入质量分散１０％ＺｒＯ２为宜。     

氧和铝在氧化铝中的自扩散参数评估

评估了氧和铝在Ａｌ２Ｏ３中的自扩散参数,分析了其扩散机理．得出：（１）在１７７０～２１００Ｋ 温度范围内,氧分压不超过１．０×１０５Ｐａ时,杂质总含量为３０×１０－６～５００×１０－６,Ｍｇ,Ｔｉ含量低于３０× １０－６的未掺杂Ａｌ２Ｏ３单晶中,氧的自扩散系数与温度的关系式,氧分压和扩散方向对该扩散系数 值影响不明显．（２）在１９４３～２１７８Ｋ范围,多晶Ａｌ２Ｏ３中铝的自扩散系数在１０－１５到１０－１４ｍ２／ｓ之间, 扩散活化能为 ４７７ ｋＪ／ｍｏｌ．（３）单晶Ａｌ２Ｏ３中主要杂质为ＴｉＯ２和 ＭｇＯ,掺Ｔｉ将降低氧的自扩散系 数,增加铝的自扩散系数;掺Ｍｇ使氧的自扩散系数略有增加;其他杂质对氧和铝在Ａｌ２Ｏ３中的 扩散系数影响不大．（４）氧和铝均通过空位扩散．     

高d33.g33值PZT压电陶瓷材料中Sb2O3掺杂的作用

Ｓｂ２Ｏ３对Ｐｂ（Ｚｒ０．５４Ｔｉ０．４６）Ｏ３的掺杂改性具有调整材料四方度（ｃ／ａ）的作用．实验表明，Ｓｂ２Ｏ３的适量添加可使材料四方度的调整达到一个较佳值，从而得到ｄ３３＝５７０×１０－１２Ｃ／Ｎ、ｇ３３＝３２×１０－３Ｖｍ／Ｎ的高压电活性的材料组成．该材料可获得各种重要应用     

Nb掺杂Ba—Sn—W—O系半导瓷材料特性的研究

研究了Ｎｂ掺杂Ｂａ－Ｓｎ－Ｗ－Ｏ系复合陶瓷材料的显微结构及电导特性。研究表明，该系列材料是主导电相为Ｂａ（Ｓｎ，Ｎｂ）Ｏ３的低Ｂ值ＮＴＣ热敏电阻材料，Ｎｂ２Ｏ５的引入，在烧结过程中可能在两主晶相晶粒的表层分别产生ＶＢａ和Ｖｏ，影响烧结过程中的扩散机制。当Ｎｂ２Ｏ５的引入量约为１．０ｍｏｌ％时，可促进该系列材料烧结成致密瓷。     

钠快离子导体Na_(3-x)Zr_(2-x)V_xSi_2PO_(12)系统的固相合成与表征

通过高温固相反应合成了钠快离子导体Ｎａ３－ｘＺｒ２－ｘＶｘＳｉ２ＰＯ１２系统的一系列合成物、其合成反应均可在低于１３７３Ｋ的温度下完成，且该系统的合成温度随ｘ增大而降低．Ｘ－射线衍射数据表明，当ｘ＜０．５时，其合成物为ＮＡＳＩＣＯＮ单纯相，其空间群为Ｃ２／ｃ，当ｘ＞０．５时，合成物开始玻璃化。系统合成物的有关晶胞参数随ｘ的增大而相应缩小，电性能测定结果表明，最好电导性的起始组成为ｘ－０．１．其导电率在室温时为５．４５×１０－４Ｓ·ｃｍ－１，在７２３Ｋ时为１．０４×１０－１ｓ·ｃｍ－１，其电导激活能为 ２３．４６ｋＪ／ｍｏｌ。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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