排序方式: 共有17条查询结果,搜索用时 31 毫秒
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" 在Pt/Ti/SiO2/Si基片上用溶胶-凝胶法与快速退火工艺制备了300 nm厚的锆钛酸铅Pb(Zr0:95Ti0:05)O3 (PZT95/5)反铁电薄膜.结果显示600~700 ℃晶化处理的钙钛矿PZT95/5薄膜具有高度(111)取向生长特性.薄膜的电性能测量采用金属-铁电-金属电容器结构.在20 V电压作用下,600~700 ℃晶化处理的PZT95/5薄膜显示出饱和电滞回线.在1 kHz下,600、650和700 ℃晶化的薄膜介电常数与损耗分别为519与0.028、677与0.029、987 相似文献
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采用氧化物固相反应法制备了锰掺杂改性的Ba(Zr0.06Ti0.94)O3陶瓷.研究了锰的掺杂量对Ba(Zr0.06Ti0.94)MnxO3 (BZTM)陶瓷的结构、介电和压电性能的影响.实验发现,当锰含量x<0.5 mol%时进入晶格,使材料压电性能提高,损耗减小,表现出受主掺杂的特性;当锰含量x>0.5 mo
关键词:
Ba(Zr
3 陶瓷')" href="#">Ti)O3 陶瓷
锰掺杂
介电性能
压电性能 相似文献
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催化动力学分光光度法测定水样中的痕量铜 总被引:6,自引:2,他引:4
在pH值为7.6的磷酸二氢钾-硼砂缓冲介质中,痕量铜(Ⅱ)可灵敏地催化H2O2氧化N,N-二甲基苯胺(DMA)与3-甲基-2-苯并噻唑-酮腙(MBTH)的氧化还原显色反应。研究了该反应的最佳条件,建立了催化动力学分光光度法测定痕量铜的新方法。该方法的线性范围为(1.5~7.7)μg/L,检出限为0.4630μg/L。该法被用于测定水样中铜的含量,获得满意结果。 相似文献
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可转换债券在我国是一种比较新的金融工具,在资本市场上的地位也越来越重要.并被誉为是上市公司再融资三驾马车之一.具有债性、股性及期权性三大特征.不同于以往复杂的定价模型,本文以可转换债券的“期权价值”为基础,利用实物期权思想,提出一个简单的模型对可转换债券的最优转换时点进行研究,并给出相应的模型刻画. 相似文献
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Based on a surface reaction mechanism for diamond deposition from the gas phase, a kinetic model is developed to describe diamond nucleation sites and the initial stage of diamond growth in chemical vapor deposition. The timein dependent solutions to the rate equations, which describe the steady-state growth of diamond films, is obtained analytically for the case of small ratio of car bon flux to atomic hydrogen flux. The time-dependent solutions obtained by nume rical methods for large ratio of carbon to atomic hydrogen flux describe the nucleation and initial gorwth stage of diamond films. This model suggests some general predictions for diamond nucleation and growth and can be used to explain several important experimental phenomena observed by others. 相似文献
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Lead strontium titanate (Pb0.50Sr0.50)TiO3 (PST) ceramics are prepared by the traditional ceramic processing. The dielectric constants and dielectric loss have been investigated in a temperature range from 25℃ to 300℃. The maximum dielectric constants for unpoled and poled samples are 9924 and 9683, respectively. The temperatures of phase transition for unpoled and poled samples are observed at 153℃ and 157℃, respectively. The phasetransition temperatures for unpoled and poled samples are not equal, which results from the polarization state of the domains. The remnant polarization and the coercive electric field are 18 uC/cm^2 and 6 kV/cm, respectively, from polarization-electric field (P - E) hysteresis loop. The temperature dependence of pyroelectric coefficients of the PST ceramics is measured by a dynamic technique. The dielectric constant and loss Lan δ of the poled PST ceramics are 813 and 0.010, respectively. The pyroelectric coefficients and figure of merit are 294 uC/cm^2 K and 13.6 × 10^-6 pa^-0.5, respectively, at room temperature 25℃and frequency lOOHz. 相似文献
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脉冲激光诱导液-固界面反应制备立方相C3N4纳米晶 总被引:2,自引:0,他引:2
β-C3N4是由Liu和Cohen等[1~3]从第一性原理出发计算而预言的一种新型超硬材料,据Liu等提出的经验公式计算认为,β-C3N4的硬度为427 GPa,具有接近金刚石的体模量(理论值为435 GPa,实验值为443 GPa). 相似文献
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