For this reason , the sensing materials for automobile exhaust gas are widely studied and exploited . in this paper , rare - earth perovskite - like complex oxide la _ 2nio _ 4 has been studies as a newly gas - sensing material used for automotive oxygen sensor 本文从la _ 2nio _ 4系稀土复合氧化物薄膜的制备方法、气敏性、掺杂改性三方面对这种新型的氧敏材料进行了系统的研究。
Due to their versatile function , oxide thin films can be widely applied in the fields of microelectronics , optoelectronics and microelectronic mechanism systems . thus the fabrication technology and growth control approach have been extensively investigated 氧化物薄膜由于其丰富的物理性质可广泛地被应用于微电子学、光电子学和微电子机械系统等领域,对其制备工艺和生长控制的研究愈加受到重视。
As one of magnetism properties in the magnetism materials , magnetoresistance ( mr ) effect shows the magnitude about resistivity dependence of the magnetic field . the time when people focus on magnetoresistance effect is the last ten years . after mr effect was discovered from the multilayered films fe / co by baibich et al in 1988 , helmolt et al got the same result from la _ ( 2 3 ) ba _ ( 1 3 ) mno _ x films 人们对磁电阻效应的研究主要在于最近的十年间，继1988年baibich等人在磁性多层膜fe co中发现了磁电阻效应后， 1993年helmolt等人在la _ ( 2 3 ) ba _ ( 1 3 ) mno _ x等镧锰氧化物薄膜材料中也发现了磁电阻效应。
Abstract : based on the ahievement of epitaxial growth in several perovskite oxide films , we discuss the importance of substrate temperature ( ts ) and substrate material in the epitaxial growth of perovskite oxide thin films . influences of ts on growth orientation and epitaxial threshold temperature were observed . the results indicate that during the growth of the oxide films the phase formation and growth dynamics should be taken into consideration . the threshold temperature for epitaxial growth depends on the substrate materials . this demonstrates the influence of substrate material on the initial nucleation and epitaxial growth 文摘:在成功地外延生长超导、铁电、铁磁等多种性质的钙钛矿结构氧化物薄膜的基础上，讨论影响氧化物薄膜外延生长的一些因素.考虑到相形成和薄膜生长动力学，在利用脉冲激光淀积法外延生长氧化物薄膜中衬底温度是十分重要的工艺参数.衬底温度对成相和生长薄膜的取向都有影响.考虑到薄膜是首先在衬底表面成核、成相并生长.因此衬底材料晶格的影响是不容忽视的.观察到衬底材料对薄膜外延生长温度的影响.在适当的工艺条件下，利用低温三步法工艺制备得到有很强织构的外延薄膜.这突出表明界面层的相互作用对钙钛矿结构薄膜的取向有着相当大的影响
The theoretical calculation and explanation of strain behavior during heteroepitaxy of oxides thin films : when the lattice mismatch is relative small ( for example , batio _ 3 / srtio _ 3 with a lattice mismatch of 2 . 18 % ) , the growth mode of thin films is layer - by - layer , and the critical thickness and strain relaxation can be calculated or estimated by matthews - blakeslee expressions ; when the lattice mismatch is large ( for example mgo / srtio _ 3 with lattice mismatch of 8 % ) , the strain relaxation process can be explained by theory of coherent strained islands 氧化物薄膜异质外延应变行为的理论预测和解释。对于晶格失配较小的外延体系(如batio3 / srtio _ 3 2 . 18 % ) ,薄膜以层状方式进行生长,临界厚度和应变释放过程可以用经典的matthews - blakeslee公式进行预测;对于晶格失配较大的体系(如mgo / srtio _ 3 8 % ) ,薄膜以岛状方式进行生长,应变释放过程可以由弹性应变岛的理论体系进行解释。
The product can be used in plastics , varnishes , enamel , cosmetics , textiles , printings , etc . the laboratory experiments were made on the hydrolysis of ticl4 solutions and deposition films of titanium hydroxides and oxyhydroxides onto the mica powder . and mainly studied the structure transformation of hydrolysis and deposition of the ticl4 solutions and the dehydrolysis of the titanium hydroxides and oxyhydroxides under the sinter processing . exclude mica powder , the specifically hydrolysis and deposition of some other metal salt such as fecl3 solutions and the dehydrolysis of the metal hydroxides and oxyhydroxides under the hydrothermal processing were also studied 本实验采用金属盐水解沉淀法，在云母粉表面镀覆tio _ 2 、 fe _ 2o _ 3 、 cr _ 2o _ 3 、 co _ 2o _ 3等不同的系列金属氧化物薄膜，通过实验室和中间试验研究了云母珠光颜料的全部制作过程，并重点研究分析了镀膜过程中偏钛酸沉淀物自ticl _ 4溶液中水解析出的结构变化过程以及焙烧过程中氢(羟)氧化钛缩合脱水生成氧化钛的结构变化过程。
Based on laser molecular beam epitaxy , the strain behavior and the corresponding control technology in oxides heteroepitaxial system , especially in ferroelectric thin films with perovskite structure , was systematically studied by using in situ reflected - high - energy - electron - diffraction ( rheed ) . some original and meaningful results were obtained . following aspects were included in this dissertation : the structure of thin films is analyzed by rheed 本论文基于激光分子束外延的基本原理,以高能电子反射为主要监测工具,对氧化物薄膜特别是铁电氧化物薄膜异质外延过程中应变行为及其控制方法进行了系统的研究,并取得了一系列有意义的结果,主要包括以下内容:利用反射高能电子衍射( rheed )的信息对薄膜结构进行分析。
