Zn:Fe:LiNbO3晶体全息存储性能

在ＬｉＮｂＯ３中掺进ＺｎＯ和Ｆｅ２Ｏ３生长了Ｚｎ：Ｆｅ：ＬｉＮｂＯ３晶体。     

Pr:Fe:LiNbO3晶体光折变性能的研究

在Fe∶LiNbO3中掺进Pr6011生长Pr∶Fe∶LiNbO3晶体。对晶体进行氧化－还原处理。测试晶体的指数增益系数、衍射效率、响应时间、光电导和信噪比。测试结果Pr∶Fe∶LiNbO3晶体的响应时间缩短,信噪比提高,克服了Fe∶LiNbO3响应时间长,光电导和信噪低的缺点。以Pr∶Fe∶LiNbO3晶体作为存储元件实现了全息关联存储。     

全息光子晶体的理论分析

提出用光学全息的方法来制作光子晶体，并且从理论上推导出光子晶体的周期结构，验证了光学全息方法实现光子晶体的可行性。     

对绿光敏感的全息存储光致聚合物性能的研究

报道了一种对绿光敏感的以丙烯酰胺为单体的光致聚合物，该光聚物由单体、光引发剂、共引发剂和成膜物组成。可以得到材料的最大衍射效率为55％。将光聚物用不同温度进行烘烤加热，可以看到材料的折射率调制度会增加。使用角度复用技术在光聚物中存储10幅全息图，说明所研究材料有希望于大容量体全息存储。     

用于全息记录的光致聚合物材料的研究进展

阐述了光致聚合物的反应原理、形成全息图的机理,讨论了影响光致聚合物全息存储性能的因素及其规律,同时还介绍了光致聚合物用于全息存储的最新进展,并对其发展趋势进行了展望.     

Bi12TiO20粉体的制备及性能研究

采用化学溶液分解法制备了Bi12TiO20粉体.通过XRD及光催化降解甲基橙的分析,研究了制备条件对光催化活性的影响.结果表明,在可见光下,前驱体溶液浓度为0.25mol/L,加热温度为70℃,加热时间为3h,煅烧温度为500℃,煅烧时间为2h时,所制备粉体的光催化活性最好,其光催化降解甲基橙的降解率除个别样品外均大于德国Degussa P25.制备出的Bi12TiO20材料的带隙能约为2.28eV.     

Bi_(12)SiO_20熔体表面张力对流研究

利用高温熔体实时观察装置观察和研究了Ｂｉ１２ＳｉＯ２０熔体中表面张力对流从稳态向振荡态的转变过程;稳态过程中的对流图样变化;可能与对流转变有关的两个对流区域的交叉;振荡态对流的分叉现象．     

Bi_(12)SiO_(20)∶Mn,Cr晶体的杂质诱导光色特性

采用提拉法、电阻炉加热铂坩埚,a 轴取向生长纯的 Bi_(12)SiO_(20)和 Bi_(12)SiO_(20)∶0.05wt·%MnO_2,0.02wt·%Cr_2O_3(BSO∶Mn,Cr)晶体。电子顺磁共振谱指出:光照后激活心电荷态各自为 Mn~(5+)和 Cr~(4+);其 g 因子大小分别为2.0009和1.9616。光照前 BSO∶Mn 在410～750nm 有吸收带,并和吸收边重叠,它相应于 Mn~(5+)离子 ~3A_2→~3T_2,~3T_1跃迁,Mn~(5+)和 Mn~(4+)同时在晶体里存在。光照后,Mn~(5+)离子吸收增加。另外,BSO∶Cr 光色效应可通过 Cr~(5+)→Cr~(4+)电荷传输过程来解释。纯 BSO 晶体粉末有一个 g=2.0109峰宽为75G 的 ESR 带,这带被归为本征捕获空穴心。     

Synthesis and Electrical Properties of Li-modified Bi_(0.5)Na_(0.5)TiO_3-BaTiO_3 Lead-free Piezoelectric Ceramics

Lead-free piezoelectric ceramics (1-y)Bi0.5(Na1-xLix)0.5TiO3-yBaTiO3 with x=0-0.125 and y=0.02-0.12 were fabricated by a solid-state reaction process, and their dielectric, piezoelectric and ferroelectric properties were investigated. The results show that the addition of Li+ significantly improves the sintering performance and piezoelectric properties of the ceramics. X-ray diffraction (XRD) patterns indicate that the ceramics possess pure perovskite structure. At room temperature, the ceramics provide hig...     

锗酸铋晶体光电导性质的研究

生长了六种掺杂锗酸铋(简称 BGO)晶体(分别掺 Fe、Cr、Mn、W、Pb 和 Ce)。在合适的测试条件下,测量了它们的光吸收系数、光电导参数和暗电导率,并与未掺杂样品进行了比较。计算出了样品的特征参量μφτ,为上述材料光折变性质的研究提供了必不可少的数据。在此基础上,对 BG0∶Cr、BGO∶Fe 和BGO∶Mn 晶体的光折变机制进行了简略的讨论,认为 BGO∶Cr 中的光折变中心可能是:Cr~(3+)作为施主,Cr~(4+)作为电子陷阱;或 Cr~(4+)作为受主,Cr~(3+)为空穴陷阱。     

Microstructure and Ferroelectric Properties of (Bi_(0.9)Ho_(0.1))_(3.999)Ti_(2.997)V_(0.003)O_(12) Thin Films Prepared by Sol-gel Method for Nonvolatile Memory

The (Bi0.9Ho0.1)3.999Ti2.997V0.003O12 (BHTV) films have been prepared on Pt/Ti/SiO2/Si substrates by solgel method. The microstructure and ferroelectric properties of the BHTV films were investigated. The BHTV films show a single phase of Bi-layered Aurivillius structure and dense microstructure. The Ho3+/V5+ cosubstitution can effectively improve the ferroelectric properties. The BHTV film exhibits good ferroelectric properties with 2Pr of 47.6℃/cm2, 2Ec of 265 kV/cm (at applied field of 420 kV/cm), dielec...     

液相自组装制备钛酸铋功能陶瓷薄膜的工艺研究

以硝酸铋和氟钛酸铵为原料,以三氯十八烷基硅烷(OTS)为模板,利用自组装单层膜(SAM)技术,在玻璃基片上制备钛酸铋薄膜.改性基板的亲水性测定与原子力显微镜(AFM)测试表明,紫外光照射使基板由疏水转变为亲水,能够对OTS-SAM起到修饰作用.借助XRD,SEM测试手段分析了前驱液的pH值、沉积条件和煅烧温度对Bi4 ...     

Construction of novel TiO_2/Bi_4Ti_3O_(12)/MoS_2 core/shell nanofibers for enhanced visible light photocatalysis

TiO2/Bi4 Ti3 O12 hybrids have been widely prepared as promising photocatalysts for decomposing organic contaminations.However,the insufficient visible light absorption and low charge separation efficiency lead to their poor photocatalytic activity.Herein,a robust methodology to construct novel TiO2/Bi4 Ti3 O12/MoS2 core/shell structures as visible light photocatalysts is presented.Homogeneous bismuth oxyiodide(BiOI) nanoplates were immobilized on electrospun TiO2 nanofiber surface by successive ionic layer adsorption and reaction(SILAR) method.TiO2/Bi4 Ti3 O12 core/shell nanofibers were conveniently prepared by partial conversion of TiO2 to high crystallized Bi4 Ti3 O12 shells through a solid-state reaction with BiOI nanoplates,which is accompanied with certain transition of TiO2 from anatase to rutile phase.Afterwards,MoS2 nanosheets with several layers thick were uniform decorated on the TiO2/Bi4 TiO3 O12 fiber surface resulting in TiO2/Bi4 Ti3 O12/MoS2 structures.Significant enhancement of visible light absorption and photo-generated charge separation of TiO2/Bi4 Ti3 O12 were achieved by introduction of MoS2.As a result,the optimized TiO2/Bi4 Ti3 O12/MoS2-2 presents 60% improvement for photodegrading RhB after 120 min irradiation under visible light and 3 times higher of apparent reaction rate constant in compared with the TiO2/Bi4 Ti3 O12.This synthetic method can also be used to establish other photocatalysts simply at low cost,therefore,is suitable for practical applications.     

Sol-gel法制备Si基Bi_(3.15)Nd_(0.85)Ti_3O_(12)铁电薄膜

采用Sol-gel法分别在Si(100)和Si(111)衬底上制备Bi_(3.15)Nd_(0.85)Ti_3O_(12)(BNT)铁电薄膜。研究了衬底、退火温度、退火保温时间和薄膜厚度等因素对BNT铁电薄膜结晶和微观结构的影响。在500℃退火的BNT薄膜已经结晶形成层状钙钛矿相;升高退火温度(500～800℃)、延长保温时间(30～150min)、增加薄膜厚度(170～850nm),都有利于BNT薄膜晶粒长大,其中退火温度和薄膜厚度是影响晶粒长大的关键因素;每次涂覆的厚度大约是85nm。与Si(100)衬底相比,由于Si(111)与BNT薄膜具有更好的晶格匹配,因此BNT薄膜在Si(111)衬底上更容易结晶。