在N2中[VnCr3—n（μ3—O）（μ—O2CCH3）6（THF）3]X[n=0—3,X=Cl^—1,ClO4^—,（VO5）0.5^—]及[VnFe3—n（μ3—O）（μ—O2CCH3）6（THF）3]X（n=0—3,X=Cl^—1）

The reaction behavior of the title complexes have been investigated by means of in situ IR in nitrogen atmosphere. It has been found that they enabled the acetic acid to convert to acetone and methane in different temperatures. The results indicate that the sequence of the ketonization reaction activity for the clusters was [V3OAT] > [VFe2OAT], [V2CrOAT] > [Fe3OAT], [VCr2OAT] > [Cr3OAT] [OAT = (mu 3-O) (mu-O2CCH3)6 (THF)3], and the sequence of the methanation reaction activity for the clusters was [Cr3OAT] > [VCr2OAT], [V2CrOAT] > [V3OAT] > [VFe2OAT], [Fe2OAH]. The ketonization reaction activity of [Fe3OAT] were obviously lower than that of [Fe3OAH] [OAH = (mu 3-O) (mu-O2CCH3)6 (H2O)3] and the methanation reaction activity of [Cr3OAT] were also much lower than that of [Cr3OAH]. The difference between [Fe3OAH], [Cr3OAT] and [Fe3OAH], [Cr3OAH] mentioned above were discussed.     

Na（4D）＋Na（3S）=Na（4F）＋Na（3S）碰撞能量转移截面

利用双光子吸收，将Ｎａ（３Ｓ）原子激发到４Ｄ态，测量了Ｎａ（４Ｄ）＋Ｎａ（３Ｓ）＝Ｎａ（４Ｆ）＋Ｎａ（３Ｓ）碰撞能量转移截面，因为直接由４Ｆ→３Ｄ的荧光不能探测，所以检测３Ｄ→３Ｐ级联荧光讯号。结合基态钠原子密度的测量，给出了截面值σ４Ｄ→４Ｆ－１．３×１０＾－１４±２８％（ｃｍ＾２）。     

Growht and defects in YbxY1—xAl3（BO3）4 crystals

YbxY1-xAl3(BO3)4(x=0.1,0.07 and 0)crystals have been grown by the flux method.The growth defects of YbxY1-xAl3(BO3)4 crystals were detected by X-ray topography.It is found that the perfcetion of YbYAB crystal with low Yb dopant is better than that with high Yb dopant.In Yb0.1Y0.9Al3(BO3)4 crystal,growht bands,growth boundaries,grown-in dislocations and inclusions were observed.Howver,the densities of growth defects for Yb0.07Y0.93Al3(BO3)4 and YAl3(BO3)4 are low and no obvious inclusions are observed in these crytals.In addition,growth twins wrer detected in YbxY1-xAl3(BO3)4 crystal by using the chemical etching method.It is found that the growth twins occur frequently in Yb0.01Y0.9Al3(BO3)4 crystal whereas no growth twin appears in YAl3(BO3)4 crystal. Based on the experimental observations,the formation mechanism of growth twins is discussed.In the meantime,the effective measures for reducing the growth twins and defects are proposed.2001 Elsevier Science B.V.All rights reserved.     

Sr_3Ga_2Ge_4O_（14）晶体中Cr~（3＋）和Cr~（4＋）吸收光谱

采用提拉法生长了掺Ｃｒ的Ｓｒ３Ｇａ２Ｇｅ４Ｏ１４低温石榴石结构型单晶，测量了它的吸收光谱及其偏振特性，系统描述了该晶体在可见和近红外波段各吸收带的特征，指出Ｃｒ在此晶体晶格中主要存在两种价态Ｃｒ３＋和Ｃｒ４＋，Ｃｒ４＋在近红外的吸收将影响到Ｃｒ３＋的发光。     

掺Ce~（3＋）、Tb~（3＋）的M_3Y_2（BO_3）_4（M＝Ca，Sr）

采用固相反应的方法；经二次灼烧合成了掺Ｃｅ（３＋）、Ｔｂ（３＋）的Ｃａ３Ｙ２（ＢＯ３）４和Ｓｒ３Ｙ２（ＢＯ３）４磷光体；分析了合成过程中铈的还原情况．用Ｘ－射线衍射分析确定了它们的结构均为正交晶系，空间群Ｐ２１ｃｎ测定了Ｃｅ（３＋）和Ｔｂ（３＋）在两种基质中的光谱，得到Ｃｅ（３＋）波长位移的某些规律，观察到Ｃｅ（３＋）对Ｔｂ（３＋）的敏化作用．     

N（4Su）＋CH）（a^4Σ^—）体系的分子反应动力学研究

用轨线法对Ｎ（＾４Ｓｕ）＋ＣＨ（０,０）→ＣＮ（ｖ＇,Ｊ＾＇）＋Ｈ（Ｓｇ）和Ｎ（＾４Ｓｕ）＋ＣＨ（０,０）→ＮＨ（ｖ＇,Ｊ＇）＋Ｃ（＾３Ｐｇ）反应进行计算,研究了上反应的阈能、反应截面、产物散射分析和微观反应机理。     

[OsⅣ（N）（NH3）4]（CF3SO3）3电化学还原过程的原位FTIR光 …

运用原位ＦＴＩＲＳ,ＵＶ／Ｖｉｓ和电化学方法研究了乙腈溶液中「ＯｓⅣ（Ｎ）（ＮＨ３）４」（ＣＦ３ＳＯ３）３在ＧＣ和Ｐｔ电极上的还原过程。结果首次在Ｐｔ电极上检测到桥氮物种υ（Ｎ≡Ｎ）的红外谱峰,位于２０１９和１９７０ｃｍ＾－１附近,分别指认为「Ⅲ,Ⅱ」和「Ⅱ,Ⅱ」混合价桥氮俄络合物。为进一步探讨桥氮偶联过程提供了新的谱学数据。     

Growth,defects,and properties of GdCa4O（BO3）3 and Nd：GdCa4O（BO3）3 crystals

Pure and neodymium-doped gadolinium calcium oxoborate crystals of high quality were grown by the Czochralski method.The orientation of crystal was precisely determined,and the samples for measurements were prepared.Through synchrotron x-ray topography and high-resolution x-ray diffractometry,the twin structure was discovered.Some properties such as the figure of merit value,and dielectric,piezoelectric,and elastic constants were meausured along with a discussion of the anisotropy of the laser properties.     

氮化硅（Si3N4）—稀土氧化物陶瓷的超高压烧结研究

在5～7GPa,600～1800℃的压力-温度范围内对组份为氮化硅-稀土氧化物微粉混合体(3Si_3N,+0.5La_2O_3+0.5Pr_6O_(11)(mol.％))的烧结产物进行了研究。所得结果表明其成相规律与Sialon体系在高温高压下烧结时不同。在直到5GPa的高压力下,α-Si_3N_4表现出相当高的稳定性,并不转变成β相。当烧结温度低于1600℃时,烧结体仍然由以α-Si_3N_4为基础的固溶体及稀土氧化物组成,而后者则表现出一系列相变化。当压力超过6GPa、温度高于1600℃时,物料烧结成一个新的单相高压结构ReSi_3O_2N_4。其衍射数据可以用一个正交点阵来拟合。其晶格参数为:α=1.2983nm,b=0.8140nm,c=0.4285nm。     

三氰基—5—[2—（3—乙基—2苯骈噻唑啉基）亚乙基]—4苯基2（5H）呋喃…

本文通过对标题化合物晶体结构与分子结构的分析，讨论了端基推拉电子对烯键桥键长的影响，分析间的相互作用及分子中生色团的电荷转移等情况。从而为解释一系列的实验现象提供了依据。     

液晶冠醚4—（烯丙基氧）—4′—（4′—羧基苯并—15—冠—5）联苯的变温红外光谱和拉曼光谱研究

本文用红外光谱法和激光拉曼光谱法研究了液晶冠醚４一（烯丙基氧）一４′一（４′一羧基苯并一１５一冠一５）联苯在升温时从结晶态到液晶态再到各向同住的液态相转变过程中红外光谱和拉曼光谱的变化。对该液晶冠醚的红外和拉曼特征频串进行了初步的经验式归属，并以频率位移、相对强度及峰形的变化描述了该化合物的相转变并初步讨论了相转变过程中光谱信息与分子结构的关系。     

含O3MoS3单元的配合物[Mox（CO）y（O,S—C6H4—1,2）3FezLm[^n—（x=1,2或3,y=0,3

用红外光谱研究标题配合物的结构,得到了很有意义的结果。     

纳米（Li2AO4）1—x—（ZrO2）x固体电解质陶瓷

用溶液凝胶共混法制备了纳米级的Ｌｉ２ＳＯ４－ＺｒＯ２复合固体电解质陶瓷。在复合陶瓷中，Ｌｉ２ＳＯ４、ＺｒＯ２的晶粒平均尺寸分别为４５、２７ｎｍ。晶粒尺寸的纳米化在材料中引入了大量的界面结构和表面结构。研究了掺不同量的纳米ＺｒＯ２第二相对Ｌｉ２ＳＯ４相变温度、相变行为及体系电导的影响，在纳米ＺｒＯ２作用下，Ｌｉ２ＳＯ４的相变温度可以降低１４０℃。在适当配比时，在５４０℃其离子电导可达到０．２Ｓ／ｃｍ