| 1. | The rietveld method is a process of refinement in terms of a postulated method .
Rietveld方法是一个取决于假设模型的精化过程。 |
| 2. | The rietveld method is a process of refinement in terms of a postulated method
Rietveld方法是一个取决于假设模型的精化过程。 |
| 3. | Moreover , we got the accurate figure of the crystal structure of ti stone through the rietveld method
还通过rieweld方法对钛宝石晶体的结构进行了精确的表征。 |
| 4. | The xrd dates were refined by rietveld method of whole pattern fitting by using the computer progress of dbws - 9411 , and then the exact crystal structures were got
用计算机程序dbws - 9411 ，对yag的粉末衍射数据进行了rietveld全谱图拟合，得到了准确的物相结构。 |
| 5. | Through the rietveld method of whole pattern fitting of the three parts , we found that the distribution of ti ions in the crystal increase from the bottom to the top
通过rietveld方法对钛宝石晶体三个部位进行全谱拟合，晶体中钛离子分布是从晶体的底部至晶体的顶部逐渐增加的。 |
| 6. | The structure of triuranuim octaoxide ( u3o8 ) and the oxidation of uranium metal were studied by x - ray diffraction ( xrd ) and rietveld method in different partial pressure of oxygen and temperatures
本论文利用x射线衍射( xrd )并结合rietveld方法较系统地对金属铀和八氧化三铀( u _ 3o _ 8 )在不同温度、压力条件下的表层氧化情况和结构变化进行了分析研究。 |
| 7. | The specimens of uranium flat were heated in air , oxygen or low pressure , to investigate the formation of uo2 + x and u3o8 on the surface layer of specimens . the processes of oxidation to uo2 + x and u3o8 were analyzed by xrd to determine the extent of surface layer oxidation and the structure of oxidations . the xrd patterns were fitted by rietveld method to refine the structure of different phases and to calculate quantificationally
对金属铀表层在大气环境中的氧化情况进行分析研究，结果表明：所有温度条件下，金属铀的氧化都是在表层形成一定厚度的uo _ ( 2 + x ) ，只有在较高的温度条件下(如300 )氧化物才会进一步转化为u _ 3o _ 8 。 |
| 8. | We continued to use the rietveld method of whole pattern fitting of the x - ray powder diffraction data , then found that additive mgo may bring the crystal thinning of al2o3 ceramics , which can improve many properties of ceramic materials . meanwhile , we discussed the operation mechanism of the crystal thinning
然后对其x射线粉末衍射数据进行rietveld全谱拟合，得知mgo的添加可以细化al _ 2o _ 3陶瓷的晶粒，晶粒的细化可以提高陶瓷材料的许多性能，同时对其细化晶粒的作用机理进行了讨论。 |
