稀土玻璃陶瓷现状与展望

含Nd^3 离子的激光玻璃是最普遍采用的谐振腔工作物质之一，Nd^3 离子能引起吸收和发光，它是谐振腔的发光中心。掺钕磷酸盐激光玻璃以大的发射截面、高增益逐渐取代硅酸盐激光玻璃，     

无机化合物玻璃态结构——介稳巨大络合物

迄令为止,对玻璃态的结构,尚未形成统一、公认的理论,本文提出对无机化合物玻璃态结构的看法:无机化合物玻璃是由络阴离子与阳离子组成。本文并提出:络阴离子形成的五要素、络阴离子联结的三法则、阳离子三个必备条件及巨大络合物构造的五项原理。     

Preparation and Structure Characterization of Rare Earth Doped Alumina-Siloxane Gel and Its Modification on ER Effect

A series of samples of alumina-siloxane gel wrapped by poly (methyl methacrylate) and doped with rare earths such as lanthanum, praseodymium, yttrium, gadolinium and europium were prepared. The structure features were characterized by micrograph, X-ray fluorescence spectrum, X-ray diffraction spectrum, Fourier transform infrared spectrum and differential thermal analysis.Tests indicate that rare earths modify the electrorheological effects of the stable suspensions composed of samples stirred with silicon oil.     

SrAl2O4:Eu2+,Dy3+长余辉发光材料发光性能的研究

采用微乳液法合成黄绿色SrAl2O4：Eu^2＋,Dy^3＋长余辉发光粉体,并且表征其晶体结构、激发光谱、发射光谱和余辉衰减特性.XRD分析表明：所合成的样品为SrAl2O4单斜晶系的晶体结构.激发波长的范围较宽,表明从紫外至可见光均可激发该发光材料.发射光谱主峰位于525 nm.样品在自然光照射后持续发出明亮的黄绿光.最后讨论微乳液体系中表面活性剂用量、激活剂和共激活剂浓度以及灼烧温度对产品发光性能的影响.     

Biological Function of REE in Plants ＆ Microbes

Rare earth elements （REE） and their compounds years. The bioinorganic chemical research of REE during the are widely applied in agronomic and medical fields for many past few years indicates that REE play important roles in the promotion of photosynthetic rate as well as root absorption, regulation of hormone and nitrogen metabolism, and suppression of microbes, etc. The metallic or non-metallic targets of key biomolecule in various physiological processes can be chosen by REE for the chelation or replacement, which enables REE to regulate the biological functions or behaviors of those biomolecule and consequently leads to significant embodiment of biological function of REE in plants and microbes. Overdose of REE, however, shows an inhibitory effect on living organisms. Therefore, this paper proposes two suggestions that will be available in the extension of full use of REE＇s biological function. One is to obey the dose law of REE and control REE concentrations within a safe range. The other is to further test the bioaccumulation and long-period influence of REE on organisms.     

Effects of Y2O3 on Thermal Shock of Al2O3／TiCN Composites

Advancedstructuralceramics ,suchasoxides ,nitridesandcarbides ,havebecomepreferredrefracto rymaterialsforaviation ,spaceflight ,energyandmet allurgybecauseoftheirchemicalstability ,creepresis tanceandhightemperaturestrength .Buttheyareaf fectedgreatlybyte…     

Synthesis of Long Afterglow Phosphors MAI204：Eu^2＋ , Dy^3＋ （M=Ca, Sr, Ba） by Microemulsion Method and Their Luminescent Properties

Long afterglow phosphors MAl2O4：Eu^2＋ , Dy^3＋ （M = Ca, Sr, Ba） were synthesized by microemulsion method, and their crystal structure and luminescent properties were compared and investigated. XRD patterns of samples indicate that phosphors CaAl2O4：Eu^2＋, Dy^3＋ and SrAl2O4 ： Eu^2＋, Dy^3＋ are with monoelinie crystal structure and phosphor BaAl2O4：Eu^2＋ , Dy^3＋ is with hexagonal crystal structure. The wide range of excitation spectrum of phosphors MAl2O4： Eu^2 ＋ , Dy^3＋ （M = Ca,Sr, Ba） indicates that the luminescent materials can he excited by light from ultraviolet ray to visible light and the maximum emission wavelength of phosphors MAl2O4：Eu^2＋ , Dy^3＋ （M = Ca, Sr, Ba） is found mainly at λem of 440 nm （M = Ca）, 520 nm （M = Sr） and 496 nm （M = Ba） respectively, the corresponding colors of emission light are blue, green and eyna-green respectively. The afterglow decay tendency of phosphors can he summarized as three processes： initial rapid decay, intermediate transitional decay and very long slow decay. Afterglow decay curves coincide with formula I = At^ - n, and the sequence of afterglow intensity and time is Sr 〉 Ca 〉 Ba.     

PET基磁性膜材料的制备与性能表征

用共沉淀法制备出具有磁性的Fe3O4纳米粒子水溶液。红外光谱和XRD表明,纳米粒子是Fe3O4且其粒径在15 nm左右。通过磁滞回线得到纳米粒子比饱和磁化强度σr=56.58 emu/g。对PET薄膜进行预处理和阴离子化后,在PET表面交替吸附聚电解质聚二甲基二烯丙基氯化铵(PDDA)和纳米粒子水溶液,由于PDDA的存在,Fe3O4纳米粒子能均匀地被吸附在PET表面,形成PET基磁性膜材料,且吸附的强度较强。该材料的矫顽力为41.11 Oe,剩余磁化强度为0.66 emu,与Fe3O4纳米粒子一样,具有超顺磁性。     

Fatigue Resistance of Filled NR with PMMA—Wrapped and Rare Earth—Doped Alumina—Siloxane Gel

Poly(methyl methacryate0(PMMA)was used to wrap alumina-siloxane sol which was produced by water glass,aluminum nitrate and α－methacrylic acid,and as a result,alumina-siloxane gel wrapped by PMMA was obtained.Meanwhile,rare earth ions were employed to dope in the course of reaction,and the formed rare earth doped PMMWmicrocapsule powder was filled into natural rudbber(NR),It,is found through the analysis of mechanical properties that Young′s modulus universally improves and a remarkable resistance to fatigueis displayed.Retention rate of tensile strength is twice that of the controlled sample after ten thousand times of extension fatigue.