But the grain growth , grain semiconduction and grain boundary insulation were influenced by many factors , such as the type and contents of dopants , sintering temperature and so on . therefore , in this thesis the effect of the restore sintering temperature , the oxygenize temperature , the donor and acceptor dopant on the dielectric and varistor properties of devices were studied . with sem , the microstructure of srtio3 - based double function ceramic was analyzed 而晶粒生长、晶粒半导化和晶界绝缘化受到多种因素的影响，诸如杂质的种类和含量、烧成温度等，因此本论文研究了还原烧成温度、中温氧化温度、施主和受主掺杂等对srtio _ 3基陶瓷的压敏和介电性能的影响，并借助于sem分析对srtio _ 3基双功能陶瓷的微观结构进行了分析。
Research of this thesis include two parts mainly , first part include the preparation of srtio3 powder materials by sol - gel process and solid phase synthesis process . the second part , on the base of strontium titanate powder materials prepared , srtio3 - based capacitor - varistor double function ceramic were fabricated by the conventional ceramic process 第二部分是在制备的钛酸锶粉体材料的基础上，通过掺杂施主、受主离子对钛酸锶材料进行半导化，制备电容-压敏双功能器件，并对两种方法制备的元件性能分析比较。
We have investigated the influence on the character of cdte thin films with different conditions and parameters . secondly , in normal temperature , cdte thin films are high resistance semiconductor , for improving its electricity capability , we commonly inject benefactor or acceptor impurities into the pure cdte thin films , the ion influx technique is a good method among many adulteration means . at present , the literatures on the doped cdte thin films by the ion influx technique have a fat lot reports 本论文首先采用近距离升华法在不同基片上制备cdte薄膜,研究了不同工艺条件和参数对cdte薄膜性质的影响。其次,在常温下,本征cdte薄膜均为高阻半导体。为了改善其导电性能,通常向cdte薄膜中掺入施主或受主杂质,其中离子注入技术是掺杂方法之一。
The factorial test method was used to investigate the influence of cu and alkali metals , the mechanism is explained from the point of view of the microstructure . the formation of the boundary layer is introduced . mn is widely used in the electronic ceramic , here i calculate its phase - change temperature from both theory and experiment result , we get almost the same outcome , by the way , its function as acceptor and its influence on the electric property is analysed 在主合成料制备过程中利用正交实验法分析了cu与碱金属所起的作用，并从微观结构的角度上做出了解释；介绍了晶界层的形成原理；对于电子陶瓷中广泛使用的mn ，从理论与试验结果两方面对其相变温度进行了计算，得出了一致的结果，还分析了它的受主作用与对电性能的影响。
We measured the samples " electrical properties ( square resistance , square carrier concentration , carrier mobility and hall coefficient ) at room temperature by hall measurement . the experimental results revealed that all the samples are p - type , with increasing the annealing temperature , the carrier mobility increased and the square carrier concentration decreased . these changes in electrical properties are explained by a decrease in the number of mn acceptors because of the forming of mnas phase and the resuming of lattice defects during annealing 所有样品均为p型导电类型；发现在650到850温度范围内，随着退火温度的升高，样品的方块载流子浓度呈下降趋势，而载流子迁移率呈上升趋势；这是由于在退火过程中，随着退火温度的升高，有更多的mn参与mnas相的形成，使得以替位受主形式存在的mn减少，并且晶格缺陷得到恢复所致。
Subcontracting of international engineering is composed of international engineering . the time of our country contract international engineering is very short so that we can not grasp the complex nature of international engineering . it is showed that the question of easily emerge in international engineering labor only subcontractor and full subcontractor of our country . for example , there is not the process of the signature of subcontractor in the international contractor conditions 本文阐明了目前我国国际工程劳务分包合同和施工全包性分包合同中容易产生的问题，如，国际合同条款中没有明确的分包合同签订过程，分包合同管理不规范，分包合同受主合同制约太大，承包商、分包商、业主之间没有公正的第三方等等。
