Ba0.9Sr0.1TiO3薄膜的椭偏光谱研究

用椭偏光谱仪首次在光子能量为2．1－5．2eV的范围内,测量了不同热处理温度下Ba0.9Sr0.1TiO3(BST)薄膜的椭偏光谱。建立适当的拟合模型,并用Cauchy色散模型描述BST薄膜的光学性质,用最优化法获得了所用样品的光学常数（折射率n和消光系数k）谱及禁带能Eg比较这些结果,初步得到了BST薄膜的折射率n、消光系数k和禁带能Eg随退火温度变化的变化规律。     

Ba0.9Sr0.1TiO3薄膜的椭偏光谱研究

用椭偏光谱仪首次在光子能量为2.15.2eV的范围内,测量了不同热处理温度下Ba0.9Sr0.1TiO3(BST)薄膜的椭偏光谱.建立适当的拟合模型,并用Cauchy色散模型描述BST薄膜的光学性质,用最优化法获得了所有样品的光学常数(折射率n和消光系数k)谱及禁带能Eg.比较这些结果,初步得到了BST薄膜的折射率n、消光系数k和禁带能Eg随退火温度变化的变化规律.     

(Pb,Ca)TiO3铁电薄膜光学性质的研究

用溶胶凝胶法在Ｓｉ（１００）衬底上制备了（Ｐｂ,Ｃａ）ＴｉＯ３铁电薄膜样品,测量了其在２．３￣５．０ｅＶ能量范围的鸫谱,并获得样品的膜厚和在该区间的光学常数谱,实验发现Ｐｂ离子被Ｃａ离子取代后,折射率向低能方向移动;同时随着Ｃａ含量的增加,（Ｐｂ１Ｃａ（ＴＩＯ３工能方向移动,表明Ｃａ离子取代Ｐｂ离子后,禁带宽度Ｅｇ减小,还了引起折射率峰移动和禁带宽度Ｅｇ减小的原因。     

双噁唑啉化合物对PBT的增粘作用

以２．２＇－双（２－唑啉）和双（２－唑啉基）苯作扩链剂，用焙融挤出的方法，对聚对苯二甲酸丁二酯（ＰＢＴ）进行扩链，考察扩链剂的用量、反应时间和反应温度对ＰＢＴ的特性粘度及端羧基含量（ＣＶ）的影响。结果表明，当用２，２＇－双（２－唑啉）作扩链剂时，ＰＢＴ的特性粘度［η］从０．７９９提高到０．９２６ｄＬ／ｇ，ＣＶ降至５ｅｑ／１０￣６ｇ以下；当用双（２－　唑啉基）苯作扩链剂，［η］从０．７６３增至０．９２５ｄＬ／ｇ，ＣＶ降至１０ｅｑ／１０￣６ｇ以下，达到了较满意的扩链效果。     

Ba0.7Sr0.3TiO3薄膜的制备、结构及性能研究

研究了一种以乙二醇为稳定剂的新的ＢＳＴ前驱液,用ｓｏｌ－ｇｅｌ法在Ｐｔ／Ｔｉ／ＳｉＯ_２／Ｓｉ（１００）基底上成功地制备出具有优良电学性能的Ｂａ_０．７Ｓｒ_０．３　ＴｉＯ_３薄膜．乙二醇的加入有效地增加了前驱液的稳定性,并降低薄膜的结晶温度．利用ＸＲＤ、ＤＴＡ等技术分析了凝胶热处理过程中相变化情况及薄膜厚度与成相的关系．厚度 ２００ｎｍ,Ｏ_２气氛中 ７００℃处理 １５ｍｉｎ后的 ＢＳＴ薄膜具有良好的介电性能,１００ｋＨｚ时介电常数ε＞４００,介电损耗 Ｄ＜０．０２;Ｐ—Ｅ电滞回线说明薄膜具有良好的铁电性能,剩余极化只约为１．４μＣ／ｃｍ^２,矫顽场强 Ｅ_ｃ约为 ４８ｋＶ／ｃｍ．     

涂层与薄膜

２０００１２０１ 原位退火时磁控溅射Ｎｄ１Ｂａ２Ｃｕ３Ｏ７－δ薄膜的影响——Ｍｏｒｉ Ｚ．Ｔｈｉｎ Ｓｏｌｉｄ Ｆｉｌｍｓ,１９９９,３５４（１～２）：１９５（英文） ＮｄＢａ２Ｃｕ３３Ｏ７－δ（ＮＢＣＯ）薄膜经原位退火后,薄膜质量得到改善。用单靶直流磁控溅射方法在 ＭｇＯ（１００）上制备 ＮＢＣＯ薄膜,沉积后将薄膜冷却至室温,然后在４００ＰａＯ２气氛中,将沉积室温升高至３５０－６００℃,保温０．５～８０．０ ｈ。经此处理后,薄膜的超导性能以及电阻率、粗糙度明显改善。原位退火后可提高薄膜Ｃ轴向零电阻温度…     

铌酸锶钡薄膜制备及椭偏光谱研究

用溶胶-凝胶法成功地制备出了退火温度分别为500、600、700、800、900℃的铌酸锶钡(SBN)薄膜;对制备出SBN薄膜分别进行了椭偏光谱测量研究,得到了不同退火SBN薄膜椭偏光谱参数曲线;并对测得的椭偏光谱进行了数值反演计算,得到了不同退火温度的SBN薄膜的光学常数谱.结果发现SBN薄膜的折射率和消光系数都随着退火温度的增高而增大.     

光子扫描隧道显微镜测量折射率图象的初步研究

光子扫描隧道显微镜（ＰＳＴＭ：Ｐｈｏｔｏｎ Ｓｃａｎｎｉｎｇ ＴｕｎｎｅｌｉｎｇＭｉｃｒｏｓｃｏｐｅ）测得的图象不仅与形貌有关,而且与贯穿整个样品的光学参数有关,即有可能用它获取样品折射率图象。本文在理想情况下运用多层薄膜理论,分析了ＰＳＴＭ中各种参量（样品层折射率ｎ１,厚度ｄ１,入射角θ０）对折射率测量的影响。结果表明在适当的样品厚度ｄ１（ｄ１≤λ／８）,能达到较大灵敏度,且无明显假象,结论可供     

Ti系高效催化剂乙烯—1—相烯气相共聚反应及共聚物结构…

研究了Ｔｉ－Ｍｇ催化剂（ＭＧ型）的乙烯－１－丁烯气相共聚合。常压下聚合动力学曲线为衰减型。催化效率为１０．２－１１．０ｋｇ ＰＥ／ｇＴｉ，产物密度ｄ＝０．９０５－０．９２２ｇ／ｃｍ＾３。Φ－１００流化床共聚合（１．２ＰＭａ）催化效率为１３７－１７３ｋｇＰＥ／ｇＴｉ。产物特性粘度「η」ＭＩ２．１６、ＭＦＲ１０．０／２．１６分别为１．０９－２．２２、１．０－６．９、７．８－１０．４。共聚物熔点、结晶度     

水基金属有机物分解法制备Ba0.5Sr0.5TiO3薄膜的研究

制备了水基Ｂａ＾２＋、Ｓｒ＾２＋、Ｔｉ＾４＋三元有机物溶液。根据红外光 谱测定及对比实验分析了溶液配制过程中化学反应机理。采用金属有机物分解法（ＭＯＤ）制备Ｂａ０．５Ｓｒ０．５ＴｉＯ３（ＢＳＴ）薄膜。通过ＸＲＤ、ＳＥ趱 阻抗分析仪等分析测试手段,薄膜的相结构、微观形态及电性能。结果表明,所制备ＢＳＴ薄 数矿晶相结构,结晶完整晶粒小（１０－５０ｎｍ）,显微结构均匀致密,并具有良好的电性能（电容密度为     

La0.5Y0.5Ni4.8Mn0.1Al0.1和La0.5Y0.5Ni4.8Al0.2合金的储氢性能研究

针对两种新型稀土型储氢合金La0.5Y0.5Ni4.8Mn0.1Al0.1和La0.5Y0.5Ni4.8Al0.2的储氢特性进行研究分析。实验表明,相同温度下,La0.5Y0.5Ni4.8Mn0.1Al0.1和La0.5Y0.5Ni4.8Al0.2合金的PCT曲线基本重合,且都具有优良的吸氢动力学性能;相比之下,后者的滞后系数要小于前者,吸氢量较大,吸氢速率也较快,故其储氢性能较优。300次吸放氢循环实验结果表明,La0.5Y0.5Ni4.8Al0.2合金的吸氢动力学性能虽然略有下降,但抗粉化性能较好。     

Dy0.6Tb0.3Pr0.1(Fe0.95Mn0.05)x取向晶体的结构与磁致伸缩

采用Ｃｚｏｃｈｒａｌｓｋｉ方法生长了Ｄｙ０．６Ｔｂ０．３Ｐｒ０．１（Ｆｅ０．９５Ｍｎ０．０５）ｘ（１．８５≤ｘ≤１．９５）取向合金。所有合金主相为立方Ｌａｖｅｓ相结构,择优取向不完整择优取向的方向与Ｘ的大小有关。研究了沿着这些样品的生长方向的磁致伸缩性能以及磁致伸缩性能与压力之间的关系。     

Thermal Stability of Amorphous Hydride Mg_(50)Ni_(50)H_(54) and Mg_(30)Ni_(70)H_(45)

The thermal stability of amorphous ternary hydrides Mg_(50)Ni_(50)H_(54) and Mg_(30)Ni_(70)H_(45) and their corre-sponding amorphous binary alloys Mg_(50)Ni_(50) and Mg_(30)Ni_(70) were studied with X-ray diffraction(XRD) and differential scanning calorimetry(DSC). Samples of the amorphous alloys were preparedby mechanical alloying and the amorphous hydrides were obtained by charging the alloys with gas-eous hydrogen at 3.0 MPa and 423 K. It was found that the amorphous hydrides released most oftheir hydrogen before the crystallization of the essentially hydrogen depleted amorphous alloy. Thecrystallization temperature of amorphous Mg_(50)Ni_(50)H_(54) elevated and that of amorphousMg_(30)Ni_(70)H_(45) did not change in relation to the original binary amorphous alloy. This is very excep-tional for amorphous hydrides. The reason for the effects of hydrogen absorption/desorption on thecrystallization of amorphous alloys was discussed.     

Zr65Al7.5Ni10Cu15Co2.5合金的玻璃转变温度

根据Ｚｒ６５Ａｌ７。５Ｎｉ１０Ｃｕ１５Ｃｏ２。５合金的纳米晶，晶体，液体和玻璃比热的测量结果，研究了合金的玻璃转变温度与全金的热力学函数，动力学参数以及加热速度的关系。结果表明，非晶态合金玻璃转变所需转变激活能很小，玻璃转变温度实际上是由于加热速度引起的不同状态的玻璃与液体的热力学平衡温度。     

Acousto-optic interaction in alpha-BaB(2)O(4)and Li(2)B(4)O(7) crystals

Experimental studies and analysis of acousto-optic diffraction in alpha-BaB(2)O(4) and Li(2)B(4)O(7) crystals are given. Ultrasonic wave velocity, elastic compliance and stiffness coefficients, and piezo-optic and photoelastic coefficients of alpha-BaB(2)O(4) and Li(2)B(4)O(7) crystals are determined. The acousto-optic figure of merit has been estimated for different possible geometries of acousto-optic interaction. It is shown that the acousto-optic figures of merit for alpha-BaB(2)O(4) crystals reach the value M(2)=(270 +/- 70) x 10(-15) s(3)/kg for the case of interaction with the slowest ultrasonic wave. The directions of propagation and polarization of those acoustic waves are obtained on the basis of construction of acoustic slowness surfaces. The acousto-optic diffraction is experimentally studied for alpha-BaB(2)O(4) and Li(2)B(4)O(7) crystals.     

Nanomechanical characterization of one-step combustion-synthesized Al(4)B(2)O(9) and Al(18)B(4)O(33) nanowires

Two kinds of aluminum borate nanowires, Al(4)B(2)O(9) and Al(18)B(4)O(33), were successfully synthesized by a one-step combustion method through control of the Al:B atomic ratio and synthesis temperature. Both nanowires are single crystalline but have distinguishing growth habits. Nanoindentation tests were performed directly on individual nanowires to reveal their mechanical properties. A 70% reduction in elastic modulus was found in Al(18)B(4)O(33) nanowires compared with their bulk counterpart. Al(18)B(4)O(33) nanowires exhibited higher hardness and elastic modulus than Al(4)B(2)O(9) nanowires.     

Plasma surface treatments of poly(l-lactic acid) (PLLA) and poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV)

The surfaces of poly(l-lactic acid) (PLLA) and poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) were modified by oxygen and nitrogen plasma treatments. The physical and chemical surface characteristics were evaluated by contact angle tests, scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS). The plasma treatments caused an increase in both contact angle and roughening, altered the surface morphology, inserted polar groups, and, consequently, enhanced the hydrophilicity for both PLLA and PHBV polymers.     

Natural Passivity of Amorphous Fe_(40)Ni_(40)P_(14)B_6 and Fe_(54.6)Ni_(38)Si_(4.1)B_(2.3)V_1 Alloys

The natural passive films forrned on Fe_(40)Ni_(40)P_(14)B_6 and Fe_(54.6)Ni_(38)Si_(4.1)B_(2.3)V_1 amorphous alloys long-term exposed in air have been studied by X-ray photoelectron spectroscopy (XPS) and Auger electron (including Ar+ ion depth profiling) spectroscopy (AES). The following aspects have been investigated: (1) chemical states of the elements in the films. binding energies and the chemical shifts measured by XPSf (2) structure and composition of the films fand (3) thickness of the passive films determined by AES depth profiling and XPS analysis.     

An SANS Study of Decomposition Kinetics in Amorphous Cu_(12.5)Ni_(10)Zr_(41)Ti_(14)Be_(22.5)

Phase decomposition in amorphous Cu12.5Ni10Zr411Ti14Be22.5 alloy as annealed in the super-cooled liquid range was studied by applying small angle neutron scattering (SANS). As annealed between 600 K and 700 K, the alloy was observed to decompose into two new amorphous phases,with the second phase precipitates embedded in the matrix of the first. Long time annealing of the alloy results in crystallization in addition to evolution of the decomposed microstructure.The kinetic diagram of the decomposition and crystallization for this alloy is given. The second phase precipitates have several nanometers in size and occupy a quite low volume fraction. The decomposition of the supercooled liquid in overall temperature range exhibits the features of spinodal reaction.