排序方式: 共有28条查询结果,搜索用时 671 毫秒
1.
研究了不同成分的BiYbO_3-BaTiO_3-LiNbO_3陶瓷的晶体结构、表面形貌与介电、铁电性能。研究结果表明,BiYbO_3-BaTiO_3-LiNbO_3预烧粉体均为纯相,烧结后试样中存在少量的Bi2O_3和Yb_2TiO_5第二相,其组织致密、多边形状晶粒中有少量细小的球状晶粒存在。0.25BY-0.7BT-0.05LN陶瓷的介电常数最大(ε_(rmax)=280),剩余极化强度相对较大,P_r=0.47μC/cm2,矫顽场强E_c=19.04kV/cm。0.1BY-0.8BT-0.1LN陶瓷的剩余极化强度最大(P_(rmax)=0.83μC/cm~2),矫顽场强E_c=17.86kV/cm。 相似文献
2.
退火工艺对钛酸锶钡薄膜结构的影响 总被引:4,自引:0,他引:4
采用射频磁控溅射在Pt/Ti/SiO2/Si(100)衬底上制备Ba0.6Sr0.4TiO3(BST)铁电薄膜,在500~750℃之间对薄膜快速退火。XRD分析表明:500℃时BST薄膜开始晶化为ABO3型钙钛矿结构,温度越高结晶越完整,晶粒越大。理论计算表明,薄膜在低温退火后无择优取向,高温退火后在(111)、(210)晶面有择优取向。退火气氛、保温时间、循环次数等因素对薄膜晶粒大小无明显影响,但对表面粗糙度和结晶程度影响较大。 相似文献
3.
4.
Transport properties and anomalous fatigue effect of Ag/Bi0.9La0.lFeO3/La0.7Sr0.3MnO3 heterostructures
下载免费PDF全文
![点击此处可从《中国物理 B》网站下载免费的PDF全文](/ch/ext_images/free.gif)
The transport properties and fatigue effect of Ag/Bi0.9La0.lFeO3/La0.7Sr0.3MnO3 heterostructures are described. By examining the I-V curves, an anomalous fatigue effect was found and its influences on resistive states were studied. I-V curves combined with C-f spectra were used to directly analyze the transport properties and fatigue effect. Compared to the first I-V cycle state, this structure shows more than one order increase of resistance after 100 cycles of "I-V curve training". The redistribution of oxygen vacancies in the depletion layer of Ag/Bi0.9La0.lFeO3 is believed to be responsible for the different resistance mechanisms and tenfold magnitude drop in resistance. The resistive switching is understood to be caused by electric field-induced carrier trapping and detrapping, which changes the depletion layer thickness at the Ag/Bi0.9La0.lFeO3 interface. 相似文献
5.
6.
7.
Transport properties and anomalous fatigue effect of Ag/Bi_(0.9)La_(0.1)FeO_3/La_(0.7)Sr_(0.3)MnO_3 heterostructures
下载免费PDF全文
![点击此处可从《中国物理 B》网站下载免费的PDF全文](/ch/ext_images/free.gif)
The transport properties and fatigue effect of Ag/Bi0.9La0.1FeO3/La0.7Sr0.3MnO3 heterostructures are described. By examining the I–V curves, an anomalous fatigue effect was found and its influences on resistive states were studied. I–V curves combined with C– f spectra were used to directly analyze the transport properties and fatigue effect. Compared to the first I–V cycle state, this structure shows more than one order increase of resistance after 100 cycles of "I–V curve training". The redistribution of oxygen vacancies in the depletion layer of Ag/Bi0.9La0.1FeO3 is believed to be responsible for the different resistance mechanisms and tenfold magnitude drop in resistance. The resistive switching is understood to be caused by electric field–induced carrier trapping and detrapping, which changes the depletion layer thickness at the Ag/Bi0.9La0.1FeO3 interface. 相似文献
8.
9.
采用溶胶-凝胶匀胶法制备锆钛酸铅铁电薄膜,研究了前驱体影响因素(如有机溶剂、前驱单体加入顺序、添加剂)、溶胶影响因素(如溶胶浓度、pH值)、匀胶速度和退火温度对成膜质量及薄膜微结构、铁电性的影响.结果表明:采用乙二醇甲醚为溶剂对pb2+、Zr4+和Ti4+金属盐进行溶解优于乙醇和乙二醇,但由于乙二醇甲醚对硝酸锆的溶解性差,对硝酸锆应先用乙醇溶解再加入乙二醇甲醚的方法来进行溶解;以硝酸锆为Zr源配制溶胶时,只有先将Pb前驱液滴加到Ti前驱液中,然后再滴入Zr前驱液的方式才能得到澄清前驱体.将锆钛酸铅溶胶浓度和pH值分别控制在0.2~0.3 mol/L和2~3较为适宜,与此溶胶相适应的匀胶参数:转速为4000 r/min,时间为60 s.随退火温度升高,薄膜的晶化程度增加,且逐渐表现出(100)晶面择优取向,晶格常数c和四方率c/a逐渐增加,而晶格常数a逐渐减小;随退火温度升高,晶粒尺寸逐渐增大,使得剩余极化强度逐渐增加,矫顽场强逐渐减小.当退火温度为850 ℃时制备的锆钛酸铅薄膜具有均匀的晶粒、较低的表面粗糙度和最为优异的铁电性. 相似文献
10.