复合添加(Ca,Mg)-α-Sialon的晶胞参数研究

利用高分辨率的Ｇｕｉｎｉｅｒ－Ｈａｇｇ相机和计算机控制的底片扫描及数据处理程序系统,测定了复合添加,组份为（Ｃａ_０．５Ｍｇ_０．５）_xＳｉ_{１２－３ｘ}Al_3xＯ_ｘＮ１_６－ｘ（ｘ＝０．３、０．６、１．０和１．４）的α－Ｓｏａｌｏｎ的晶胞参数．材料由热压工艺制备而得．研究结果表明,当ｘ≥１．０时,材料的主晶相为α－Ｓｉａｌｏｎ和含Ｍｇ的ＡlＮ多型体．（Ｃａ,Ｍｇ）－α－Ｓｉａｌｏｎ的晶胞参数明显低于相同组份下的Ｃａ－α－Ｓｉａｌｏｎ的晶胞参数·ＥＤＡＸ的结果进一步给出固溶进入α－Ｓｉａｌｏｎ的包括名义组份中９０％的Ｃａ^＋＋和少量的Ｍｇ^＋＋,而大部分Ｍｇ^＋＋进入ＡlＮ多型体,这一结果为净化α－Ｓｉａｌｏｎ陶瓷的晶界提供了新的有效途径．     

Ca-α-Sialon的形成特性和显微结构的研究

由热压工艺制备了组份为Ｃａ_ｘＳｉ_{１２－３ｘ}Ａｌ_３ｘＯ_ｘＮ_１６－ｘ（０．３≤ｘ≤２．０）的Ｃａ－α－Ｓｉａｌｏｎ陶瓷。本文报道了它的反应过程、相组成、晶胞参数随组份的变化和显微结构的研究结果．研究结果表明,当ｘ≥１．０时,制备的Ｃａ－α’样品的物相由α－Ｓｉａｌｏｎ和ＡＩＮ多型体２１Ｒ组成,其中２１Ｒ的含量随ｘ值的增加而变大．ＴＥＭ的观察结果与物相分析相符,并进一步揭示了在Ｃａ－α－Ｓｉａｌｏｎ样品中长颗粒形貌的α－Ｓｉａｌｏｎ的存在．     

AIN-多型体对形成长颗粒α-Sialon的影响

通过ＳＥＭ、ＥＤＳ等方法，研究了添加不同含量ＡＩＮ－多型体对（Ｙ＋Ｓm）－α－Ｓｉａｌｏｎ晶粒形貌的影响．结果表明，随ＡＩＮ－多型体添加量增多，材料中长颗粒α－Ｓｉａｌｏｎ的数量增加．本文对ａ’－ＡＩＮ－多型体两相区内长颗粒α－Ｓｉａｌｏｎ的形成机理进行了讨论．     

（Ca,Mg）—Sialon陶瓷在多元醇及多元醇水溶液润滑下的摩擦学性能

与干摩时相比,三种醇的水溶液都降低了（Ｃａ,Ｍｇ）－Ｓｉａｌｏｎ陶瓷／ＧＣｒ１５的摩擦系数,但都不同程度地增加了陶瓷的磨损体积。所有醇都降低了（Ｃａ,Ｍｇ）－Ｓｉａｌｏｎ陶瓷／ＧＣｒ１５的摩擦系烤及（Ｃａ,Ｍｇ）－Ｓｉａｌｏｎ陶瓷的磨损体积;在乙二醇润滑下（Ｃａ,Ｍｇ）－Ｓｉａｌｏｎ陶瓷／ＧＣｒ１５表现出最低的磨擦系数（０．０６）;（Ｃａ,Ｍｇ）－Ｓｉａｌｏｎ陶瓷在二醇润下,磨损体积由大到小的顺序     

Si3N4原料对形成长颗粒 Ca-α-Sialon晶粒形貌的影响

针对固定组份的Ｃａ－α－Ｓｉａｌｏｎ系统Ｃａ１.８Ｓｉ６.６Ａl５．４Ｏ１．８Ｎ1４．２）,选用不同α／β比值的Ｓｉ３Ｎ４原料考察了无压烧结所得材料的致密化、反应过程及显微结构的异同．结果表明,由两种不同α／β比值的Ｓｉ３Ｎ４原料制备的材料,其α－Ｓｉａｌｏｎ晶粒均具有长颗粒的形貌．但高β相含量的Ｓｉ３Ｎ４原料会阻碍Ｃａ－α－Ｓｉａｌｏｎ材料的致密化,β－Ｓｉ３Ｎ４相完全消失的温度也比α－Ｓｉ３Ｎ４提高了１００℃．原料中β相含量废越高,提供给α－Ｓｉａｌｏｎ生长的核心数越少,α－Ｓｉａｌｏｎ晶粒越粗大,而且高β相Ｓｉ３Ｎ４原料中宽的粒径分布导致所得α－Ｓｉａｌｏｎ晶粒尺寸的不均匀．     

立方A^4＋M^5＋2O7型化合物与新型负热膨胀材料

概述了立方Ａ＾４＋Ｍ＾５＋２Ｏ７型化合物的结构特点，讨论了ＡＶ２－ｘＰｘＯ７型（Ａ＝Ｚｒ或Ｈｆ；ｘ＝０．１～１．２）及其部分取代的Ａ＾４＋１－ｙＢ＾４＋ｙＶ２－ｘＰｘＯ７型（Ｂ＝Ｔｉ，Ｃｅ，Ｔｈ，Ｕ，Ｍｏ，Ｐｔ，Ｐｂ，Ｓｎ，Ｇｅ或Ｓｉ；ｙ＝０．１～０．４）和Ａ＾４＋１－ｙＣ＾１＋ｙＤ＾３＋ｙＶ２－ｘＰｘＯ７型（Ｃ为碱金属元素，Ｄ为稀土金属元素）材料的负热膨胀性能。     

Si3N4原料对形成长颗粒Ca-α-Sialon晶粒形貌的影响

针对固定组份的Ｃａ－α－Ｓｉａｌｏｎ系统Ｃａ１．８Ｓｉ６．６Ａｌ５．４Ｏ１．８ｎ１４．２）,选用不同α／β比值的Ｓｉ３Ｎ４原料考究了无压烧结所得材料的致密化,反应过程及显微结构的异同。     

不同稀土元素对α-Sialon-AlN-多型体复相陶瓷生成动力学的影响

研究了以Ｙ,Ｓｍ以及复合稀土Ｙ＋Ｓｍ分别作为α－Ｓｉａｌｏｎ的形成离子,组份为 ９０ｗｔ％ α－Ｓｉａｌｏｎ（ｍ＝ １,ｎ＝ １７）＋１０ｗｔ％１２Ｈ的样品在 １４５０～１８００℃热压条件下的致密化和反 应过程．结果表明,添加Ｙ_２Ｏ_３＋Ｓｍ_２Ｏ_３复合稀土对致密化最有利,不同的稀土元素对反应过 程有较大的影响,即在 Ｓｍ－组份中 α－Ｓｉ_３Ｎ_４很快消失, α－Ｓｉａｌｏｎ与 ＡＩＮ－多型体同时形成而 Ｙ－ 组份中α－Ｓｉ_３Ｎ₄消失较慢,α－Ｓｉａｌｏｎ的形成受到ＡｌＮ一多型体的抑制．     

AIN-多型体对形成长颗粒α-Sialon的影响

通过ＳＥＭ、ＥＤＳ等方法,研究了添加不同含量ＡｌＮ－多型体对（Ｙ＋Ｓｍ）－α－Ｓ晶粒形貌的影响。结果表明,随ＡｌＮ－多型体添加量增多,材料中长颗粒α－Ｓｉａｌｏｎ的数量增加。     

稀土含氮黄长石固溶体R2Si3-xAlxO3+xN4-x的X射线衍射研究

用热压和无压烧结工艺，在１７００～１８００℃制备了含氮稀土黄长石固溶体Ｒ２Ｓｉ３－ｘＡｌｘＯ３＋ｘＮ４－ｘ（Ｒ＝Ｎｄ，Ｓｍ，ｘ＝０，０．３，０．６，１．０，１．２；Ｒ＝Ｄｙ，Ｙ，Ｘ＝０，０．３，０．６，１．０；Ｒ＝Ｙｂ，Ｘ＝０，０．３）利用Ｇｕｉｎｉｅｒ－Ｈａｅｇｇ照相法，光密度计在ＬＳ－１８和相应的程序系统（ＳＣＡＮ，ＳＣＡＮＰＩ和ＰＩＲＵＭ）给出了稀土黄长石的Ｘ射线衍射图谱，精密测定了具有不同     

微波消解-ICP-AES法测定茶叶中钾、钠、磷、硫、铁、锰、铜、锌、钙、镁方法研究

通过优化微波消解条件,并根据不同元素性质,调谐ICP-AES工作条件至最佳,实现了茶叶中K、Na、P、S以及Fe、Mn、Cu、Zn、Ca、Mg 10种元素的同时测定。10种元素测定结果 RSD%为0.67(Cu)～5.57(Na),回收率为84.0%(Na)～101.5%(Fe),检出限为0.001(Mn)～0.029(S)μg·g-1,表明该方法准确可靠,能够满足茶叶中K、Na、P、S、Fe、Mn、Cu、Zn、Ca、Mg分析要求。     

p,V, T and derived thermodynamic data for toluene,trichloromethane, dichloromethane,acetonitrile, aniline,and n-dodecane

Experimentally determined p,V,T data are reported for toluene, trichloromethane, dichloromethane, acetonitrile, aniline, and n-dodecane at 278, 288, 298, 313, and 323 K, except for dichloromethane, for which the highest temperature was 298 K. At each temperature, measurements were done at pressures up to about 280 MPa or (for aniline and n-dodecane) at a lower pressure slightly below the freezing pressure at the temperature of measurement. Values of the isobaric expansivity isothermal compressibility and (for toluene, trichloromethane, dichloromethane, and acetonitrile) internal pressure, derived from the p,V,T data, are presented.     

Optical properties of the metals Al, Co, Cu, Au, Fe, Pb, Ni, Pd, Pt, Ag, Ti, and W in the infrared and far infrared

Infrared optical constants collected from the literature are tabulated. The data for the noble metals and Al, Pb, and W can be reasonably fit using the Drude model. It is shown that -epsilon1(omega) = epsilon2(omega) approximately omega(2)(p)/(2omega(2)(tau)) at the damping frequency omega = omega(tau). Also -epsilon1(omega(tau)) approximately - (1/2) epsilon1(0), where the plasma frequency is omega(p).     

抓管理重服务求可靠要效益--记广西计量测试研究所国家实验室认可工作

我所2001年9月份顺利地通过了中国实验室认可委紧张而严格的评审,得到了权威机构认可,成为西南地区较早通过国家实验室认可的省级计量校准机构.在建立质量体系、运行质量体系走过了艰辛之路,我们将全所职工的艰辛之路介绍给大家,希望能给将要申请认可的实验室得以参考.     

Dry Autoclaving for the Nanofabrication of Sulfides,Selenides, Borides,Phosphides, Nitrides,Carbides, and Oxides

This review compiles various nanostructures fabricated by a distinct “dry autoclaving” approach, where the chemical reactions are carried out without solvents; above the dissociation temperature of the chemical precursor(s) at elevated temperature in a closed reactor. The diversity to fabricate carbides (SiC, Mo₂C, WC), oxides (VOx‐C, ZnO, Eu₂O₃, Fe₃O₄, MoO₂), hexaborides (LaB₆, CeB₆, NdB₆, SmB₆, EuB₆, GdB₆), nitrides (TiN, NbN, TaN), phosphides (PtP₂, WP), sulfides (ZnS, FeS/C, SnS/C, WS₂, WS₂/C), and selenides (Zn_1‐xMn_xSe/C, Cd_1‐xMn_xSe/C), with various shapes and sizes is accounted with plausible applications. This unique single‐step, solvent‐free synthetic process opens up a new route in the growing nanomaterials science; owing to its considerable advantages on the existing approaches.     

标准·质量·认证·会议(英文)

Standards IGRS:First Complete International Standards System in 3C Collaboration Field After ISO and IEC released three international standards of Intelligent Grouping and Resource Sharing (IGRS) including Core Protocol,File Communication Framework and Device Validation,four standards of IGRS,Application Framework,Basic Application,Service Types and Devices Types,got approved with high passing rate in the voting of Final Draft International Standard (FDIS) and will be officially issued soon around the world. It symbolizes that all     

Elastic, structural, bonding, and defect properties of zinc-blende BN, AlN, GaN, InN and their alloys

Simple tight-binding simulations, incorporating only the Herman–Skillman atomic term values, are shown to provide valuable information about the bonding, elastic and structural properties of zinc-blende group III-nitrides. Our calculated values of the elastic parameters (viz., bulk modulus, elastic stiffness constants, Kleinman's internal displacement parameter, Keating force constants, etc.) for BN, AlN, GaN, and InN are shown to exist well within the range of values derived from more sophisticated methods. Despite the crude approximations used, the tight-binding method has clearly provided the meaningful trends to the local distortions around isoelectronic impurities and has described reasonably well the bond length variations as a function of composition in ternary alloys.