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国家自然科学基金(10674034)

作品数:11 被引量:38H指数:4
相关作者:苏文辉杨延强吴文智张建平金钦汉更多>>
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11 条 记 录,以下是 1-10
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Synthesis of ZrSiO_4 and Coesite in SiO_2-ZrO_2 System Under High Pressure被引量:2
2008年
ZrSiO4 and coesite were obtained under high-pressure and high-temperature from the nano precursor of a-SiO2 and ZrO2. XRD and Raman measurements indicate that ZrSiO4 was formed at a temperature higher than 920 ℃ under a pressure of 3.6 GPa. As the pressure increased to 3.9 GPa, the ZrSiO4 formation temperature was reduced to 815 ℃. The formation temperature for coesite was 990 ℃ under 3.9 GPa. The lower formation temperature for ZrSiO4, as compared to that for coesite, provided an experimental evidence that the coesite in the Earth's surface usually occurs as inclusions in ZrSiO4.
XUE Yan-fengXU Da-pengZHANG Guang-qiangZHOU Xian-fengDING Zhan-huiLIU Xiao-meiSU Wen-hui
关键词:ZRSIO4COESITE
Electrochemical Characterization and Performance Evaluation of Pr_(0.7)Sr_(0.3)Co_(1-y)Cu_yO_(3-δ) as Cathode Material for IT-SOFCs
2007年
The cathode material Pr0.7Sr0.3Co1-yCuyO3-δ (y=0.05~0.3) was synthesized by a sol-gel method. X-ray diffraction indicated that the samples with y≤0.2 were single phase orthorhombic perovskite structure, but in the case of y=0.3, traces of a second phase were observed. The unit cell volumes increased with increasing copper content. The electrical conductivity decreased gradually with increasing Cu addition. The investigation of the electrochemical performance suggested that the sample with y=0.1 exhibited the lowest overpotential in all prepared Pr0.7Sr0.3Co1-yCuyO3-δ. With Pr0.7Sr0.3Co0.9Cu0.1O3-δ cathode and porous NiO/Ce0.8Sm0.2O1.9 anode, the single cell based on SDC thin film electrolyte was obtained by a simple dry pressing process. Maximum power densities of the cell were 406 and 481 mW·cm-2 at 700 and 750 ℃, respectively.
朱成军刘晓梅徐丹严端廷裴力苏文辉
Synthesis of Small-sized Coesite Under Lower Pressure被引量:1
2010年
With the help of high-energy mechanical milling and a-SiO2 as the initial material, we investigated the synthesis of coesite at a high temperature and high pressure under the condition of adding a certain amount of hard Fe filling. The synthetic samples were measured by XRD and Raman spectroscopy. The results show that a small amount of small-sized coesite can be obtained under 2.5 GPa and 973 K.
WANG De-junLIU Xiao-meiZHU Cheng-junYAN Duan-tingLIU Fu-linSU Wen-hui
关键词:COESITE
水溶性CdTe量子点的三阶光学非线性极化特性被引量:14
2008年
利用超短脉冲Z扫描技术和光学Kerr效应研究了以巯基丙酸为稳定剂的CdTe量子点水溶液的三阶光学非线性极化特性.在532nm,30ps和800nm,130fs脉冲激光激发下,发现分别具有正负相反取值的三阶光学非线性折射率,自由载流子吸收和双光子吸收分别是这两种脉冲激光激发下三阶光学非线性吸收的起因.测量得到CdTe量子点的三阶光学非线性极化率约为CS2的3·2倍,在520—700nm光谱区的CdTe量子点的光学响应时间小于400fs.
吴文智郑植仁金钦汉闫玉禧刘伟龙张建平杨延强苏文辉
关键词:Z扫描双光子吸收
Study on rare earth electrolyte of SDC-LSGM被引量:4
2008年
Ce0.85Sm0.15O1.925 (SDC) and La0.9Sr0.1Ga0.5Mg0.2O2.85 (LSGM) were synthesized using Glycine-Nitrate Process (GNP), and the composite electrolytes were prepared by mixing SDC and LSGM. An X-ray diffraction pattern indicated that the mixture of SDC and LSGM consisted of their original phases after heating at 1450 ℃ for 10 h. The electronic conductivity of SDC-LSGM composite electrolytes were measured by direct current polarization method using Hebb-Wagner ion blocking cell at 700-800 ℃ in the oxygen partial pressure range of 104-10-20 MPa and compared with the results of SDC. Typical polarization curves, which were theoretically predicted, were observed on all the samples. The slopes of lgσe-lgPo2 plot for all the composite electrolytes agreed with the theoretically predicted value of-1/4 at some intermediate oxygen partial pressures and -1/6 at low oxygen partial pressure. The electronic conductivity of SDC-LSGM composite electrolytes decreased with the increase in LSGM content, whereas the ionic transport number ti of all the samples increased with the increase in LSGM content.
徐丹刘晓梅朱成军王德军严端廷王德涌苏文辉
关键词:SDC
低强度飞秒激光激发下CdTe和CdTe/CdS核壳量子点的荧光上转换研究被引量:1
2009年
利用400nm和800nm不同波长的低强度飞秒激光,对CdTe和CdTe/CdS核壳量子点溶胶进行激发,研究其稳态和时间分辨荧光性质.800nm飞秒激光激发下,CdTe和CdTe/CdS核壳量子点产生上转换发光现象,上转换荧光峰与400nm激发下的荧光峰相比蓝移最多达15nm,而且蓝移值与荧光量子产率有关.变功率激发确认激发光功率与上转换荧光强度间满足二次方关系,时间分辨荧光的研究表明荧光动力学曲线服从双e指数衰减.提出表面态辅助的双光子吸收模型是低激发强度上转换发光的主要机理.CdTe和CdTe/CdS核壳量子点荧光由带边激子态和诱捕态两种成分组成,两种成分峰位不同,带边激子态波长较短,诱捕态波长较长.800nm激发与400nm激发时相比,激子态相对比重增加,这导致荧光峰的蓝移.
安利民杨延强宋维斯苏文辉曾庆辉朝克夫孔祥贵
关键词:CDTE量子点时间分辨荧光上转换荧光
CdTe/CdS量子点的Ⅰ-Ⅱ型结构转变与荧光性质被引量:7
2009年
制备了壳层厚度可以精确控制的CdTe/CdS核壳量子点,利用紫外-可见吸收光谱、光致发光光谱、透射电镜和时间分辨光谱等技术,分析了CdS壳层厚度对CdTe量子点的荧光量子产率和光谱结构的影响规律.发现了不同于CdSe/CdS,CdSe/ZnS,CdTe/ZnS等核壳量子点的荧光峰展宽、大幅度红移以及荧光寿命大幅度增加现象.根据能带的位置关系,随着CdS厚度的增加,CdTe从Ⅰ型结构逐渐过渡到Ⅱ型核壳结构.对于Ⅱ型CdTe/CdS核壳量子点,不仅存在CdTe核区导带电子与价带空穴间的直接复合,还存在CdS壳层导带电子与CdTe核价带空穴界面处的间接复合,发光机制的变化导致荧光峰的展宽、明显红移和荧光寿命的增加.当壳层过厚时,壳层表面新引入的缺陷会阻碍荧光寿命和量子产率的进一步提高.
安利民曾庆辉赵家龙宋维斯苏文辉
关键词:碲化镉量子点荧光寿命
Si-C-SiO_2体系在高压变质条件下的结构相变被引量:1
2009年
根据高能机械球磨与地球板块间的碰撞具有的碰撞局域性和剪切应力的相似特点,采用高能机械球磨与静高温、高压技术,按照质量比m(Si):m(C):m(SiO2)=65∶14∶21制成样品,人工合成柯石英.用X射线粉末衍射对经高能机械球磨后的样品进行了结构表征.结果表明:得到合成柯石英的最低条件是3.8 GPa和873K;合成的柯石英为单斜柯石英,与天然矿物中发现的柯石英晶体的结构相同.
王德军刘润茹张广强刘福林邢淑芝
关键词:柯石英高温高压
Influence of Carbon-doped Content on Formation Conditions of Coesite被引量:1
2009年
The mixtures of a-quartz and graphite powder with different mass ratios were, respectively, high-energetically mechanically milled and then treated under high pressure and high temperature. The influences of carbon content on the synthesis conditions of coesite were investigated. The experimental products were characterized by XRD, TEM, and Raman spectrometry. The results show that the existence of carbon can obviously inhibit the formation of coesite, and the higher the carbon content of the initial material, the higher the pressure for forming coesite.
WANG De-junLIU Xiao-meiZHU Cheng-junYAN Duan-tingLIU Yi-xinSUN YingLIU Fu-linSU Wen-hui
关键词:COESITEGRAPHITE
水溶性CdTe量子点的稳态和纳秒时间分辨光致发光光谱被引量:4
2007年
报道了以飞秒脉冲激光为激发光源的水溶性CdTe量子点(QDs)的稳态荧光光谱和纳秒时间分辨荧光光谱.实验发现CdTe量子点的荧光光谱峰值位置随激发波长变化发生明显移动,激发脉冲波长越长,荧光峰位红移越大.荧光动力学实验数据显示,在400nm和800nm脉冲激光激发下,水溶性CdTe量子点的荧光光谱中均含有激子态和诱捕态两个衰减成分,两者的发射峰相距很近,诱捕态的发射峰波长较长.在800nm脉冲激光激发下的诱捕态成分占总荧光强度的比重比400nm激发下的约高3倍,其相对强度的这种变化导致了稳态荧光发射峰位的红移.
吴文智闫玉禧郑植仁金钦汉刘伟龙张建平杨延强苏文辉
关键词:CDTE量子点荧光光谱上转换荧光
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