One is about of temperature - dependence of luminescence of eu3 + and tb3 + doped in oxide glass and nanocrystalline y2o3 ; the other is about of light - induced luminescent and structural change in nanocrystalline y2o3 : tb . the creative works are as follows : ( 1 ) euand tb doped nanocrystalline y2o3 with different sizes were prepared by combustion synthesis . dependences of particle size , crystallinity and fluorescence characteristic on ratio of gly / y ( no3 ) 3 and annealing temperature were studied 本文以变温与光辐照为实验方法研究了eu与tb掺杂y _ 2o _ 3纳米晶及氧化物玻璃中发光性质随温度的变化关系和光诱导y _ 2o _ 3 ： tb纳米晶发光性质及结构的改变过程，得到如下创新性研究成果： ( 1 )用燃烧法制备了稀土掺杂y _ 2o _ 3纳米晶，研究了甘氨酸与硝酸钇的反应比例( g n ) 、退火条件对稀土掺杂y _ 2o _ 3纳米晶颗粒尺寸、结晶状况及发光特性的影响。
The addition of y - zro2 improves the fracture toughness of pcd and the grinding ratio also increases with the y2o3 content increasing . the optimum comprehensive properties of pcd can be achieved as the y - zro2 powders contain 2mol % y2o3 . aluminum addition in si3n4 or si3n4 bond pcbn can prevent y - zro2 powders from forming the nontransformable tetragonal phase 在si _ 3n _ 4及si _ 3n _ 4中介结合的pcbn中加入适量的al作为烧结助剂，可以避免不可相变的t相zro _ 2形成，使应力诱导相变增韧高温高压烧结的氮化硅系陶瓷成为可能。
So re oxides has two form existence , one is concentrate on the matrix equiaxial crystal grain boundary as a micron particles and the other is distributed in matrix crystal dispersively as the nanometer particles compared the electron emission performance of mo - la2o3 , mo - ; la2o3 - y2o3 and mo - la2c > 3 - sc2o3 cathode , the mo - la2o3 - sc2c > 3 cathode show excellent electron emission character 上述研究表明不论是在稀土?钼阴极还是在稀土?钨电极中，稀土氧化物的存在形式有两种，一种是微米级的颗粒偏聚于晶界处，另外一种是弥散分布于基体晶粒的纳米小颗粒。
The lifetime of particles co - doped with li + and na + increased as compared to that of un - doped one . however , the lifetime decreased as co - doped with other dopants . in addition , we also studied that ultraviolet ( uv ) light - induced spectral change in eu3 + - doped aluminosilicate glass and red to blue up - conversion emission of tm3 + - , yb3 + - doped y2o3 nanocrystals ( 2 )在紫外光辐照下， eu ~ ( 3 + )掺杂的氧化物玻璃电荷迁移带强度降低，通过研究辐照与激光的功率密度、波长的关系，发现这种变化属于单光子过程，并具有频率选择性。
This research has studied the microstructure of cathode materials systematically by the means of high resolution transmission electron microscopy and scanning electron microscopy , surveyed the electron emission performance of la2o3 , - mo , la2o3 - y2o3 - mo , la2o3 - sc2c > 3 - mo cathode with the self - designed electron emission surveyor and analyzed the elements changing of the surface of mo - la2o3 - sc2c > 3 cathode in - situ . while it was heated to different temperature . at last , the relationship of the microstructure of cathode , diffusion of active matter and electron emission performances has been discussed 本研究采用高分辨扫描电镜、透射电镜对稀土钼钨阴极材料的显微结构进行了系统研究；利用本课题研究组设计研制的电子发射测量仪对la2o3 - mo ， la2o3 - sc2o3 - mo ， la2o3 ? y2o3 - mo三种阴极(以下称镧?钼阴极、镧钪?钼阴极、镧钇?钼阴极)的发射性能进行了测量；利用经改造后的俄歇电子能谱仪“原位”分析了发射性能较好的镧钪钼阴极在不同温度下表面活性元素的变化情况。
In the process of making 95 alumina ceramics , selected five kinds of alumina powder and studied the influence of different alumina powder on the sintering properties and mechanic properties of 95 alumina ceramics , moreover , selected the most agreeable alumina powder according to the apparatus for granularity analysis and scanning electron microscope ( sem ) . the influence of different sintering temperature on the sintering mechanic properties , the microstructure of 95 alumina ceramics were investigated by adding y2o3 and la2o3 as two kinds of rare earth additives in alumina ceramics . the results indicated that the additive of la2o3 could improve the properties of 95 alumina ceramics more effectively and could get fine grain and tabular alumina that can enhance the strength of the material 选用了五种al2o3粉料，研究了其对95al2o3瓷烧结性能和力学性能的影响，并结合粒度分析仪sem对al2o3粉料进行优选；通过添加y2o3 、 la2o3两种稀土添加剂，研究了不同烧成温度对95al2o3瓷的烧结性能、力学性能及显微结构等的影响，结果表明：添加la2o3可以有效提高95氧化铝瓷烧结性能和力学性能，形成细晶和板状氧化铝瓷的显微结构；通过对比不同氧化铝粉料制备氧化铝瓷烧成温度曲线与烧结性能的关系，确定最佳的烧成温度范围为1570 ~ 1600 。
Begin with the comparation of two widely used methods producing the strontium titanate , the oxalate decomposition method shows its advantage hi the microstructure and future performance . the effect of caco3 is studied , and so is the effect of the donor dopant , such as nb2o5 , y2o3 and la2o3 . the dopant of tio2 is also considered , which involve ti / sr ratio , sintering temperature , oxygen partial pressure , donor dopant , grain growth and future electric performance 从对比草酸盐分解法和固相合成法这两种制备srtio _ 3主晶相的方法开始，在予合成料的制备过程中分析了施主nb _ 2o _ 5 、 y _ 2o _ 3 、 la _ 2o _ 3以及caco _ 3所产生的影响；在tio _ 2掺杂的问题上，综合考虑了ti / sr比、烧结温度、氧分压、施主掺杂、晶粒的微观生长与成瓷后的元件宏观电性能等之间的相互关系。
