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High temperature thermoelectric properties of highly c-axis oriented Bi2Sr2Co2Oy thin films fabricated by pulsed laser deposition 下载免费PDF全文
High-temperature thermoelectric transport property measurements have been performed on the highly c-axis oriented Bi2Sr2Co20v thin films prepared by pulsed laser deposition on LaA1Oa (001). Both the electric resistivity p and the seebeck coefficient S of the film exhibit an increasing trend with the temperature from 300 K-1000 K and reach up to 4.8 m. cm and 202 V/K at 980 K, resulting in a power factor of 0.85 mW/mK which are comparable to those of the single crystalline samples. A small polaron hopping conduction can be responsible for the conduction mechanism of the film at high temperature. The results demonstrate that the Bi2Sr2Co2Oy thin film has potential application has high temperature thin film thermoelectric devices, 相似文献
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High temperature thermoelectric properties of highly c-axis oriented Bi<sub>2</sub>Sr<sub>2</sub>Co<sub>2</sub>O<sub>y</sub> thin films fabricated by pulsed laser deposition 下载免费PDF全文
High-temperature thermoelectric transport property measurements have been performed on the highly c-axis oriented Bi2Sr2Co2Oy thin films prepared by pulsed laser deposition on LaAlO3(001).Both the electric resistivity ρ and the seebeck coefficient S of the film exhibit an increasing trend with the temperature from 300 K-1000 K and reach up to 4.8 m·Ω· cm and 202 μV/K at 980 K,resulting in a power factor of 0.85 mW/mK which are comparable to those of the single crystalline samples.A small polaron hopping conduction can be responsible for the conduction mechanism of the film at high temperature.The results demonstrate that the Bi2Sr2Co2Oy thin film has potential application in high temperature thin film thermoelectric devices. 相似文献
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为提高空间稳定惯性导航系统的姿态精度,利用姿态误差进行系统级参数标定和校准.首先,给出了姿态误差模型,考虑陀螺漂移、加速度计误差、壳体翻滚失准角、安装误差和框架角零偏的影响;接着,利用姿态误差模型进行可辨识性讨论和分析,总结出能分离的参数和标定方法,并据此设计试验方案.获得姿态误差后,结合最小二乘法和姿态误差模型进行系统级参数标定和校准,结果表明,参数标定误差小于15%的姿态精度指标,校准后,纵横摇角和航向角精度提高了60%和40%. 相似文献
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利用脉冲激光沉积技术在c-Al2O3单晶基片上制备了Bi2Sr2Co2Oy热电薄膜并研究了沉积温度和氧压对薄膜晶体结构及电输运性能的影响.在最佳沉积条件下制备的单相、c轴取向的Bi2Sr2Co2Oy薄膜的室温电阻率ρ和塞贝克系数S分别为2.9mΩ/cm和110μupV/K,其功率因子S2/ρ好于在单晶样品上得到的值.此外,该薄膜在低温下表现出较强的负磁阻效应,在2K,9T时达到了40%. 相似文献
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Laser-induced voltage effects in Ca3Co4O9 thin films on tilted LaAlO3(001) substrates grown by chemical solution deposition 下载免费PDF全文
Laser-induced voltage effects in c-axis oriented Ca3Co4O9 thin films have been studied with samples fabricated on 10 tilted LaAlO3(001) substrates by a simple chemical solution deposition method. An open-circuit voltage with a rise time of about 10 ns and full width at half maximum of about 28 ns is detected when the film surface is irradiated by a 308-nm laser pulse with a duration of 25 ns. Besides, open-circuit voltage signals are also observed when the film surface is irradiated separately by the laser pulses of 532 nm and 1064 nm. The results indicate that Ca3Co4O9 thin films have a great potential application in the wide range photodetctor from the ultraviolet to near infrared regions. 相似文献
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为提高陀螺仪的精度,应用了壳体翻滚技术补偿与壳体有关的常值漂移误差,设计了一种基于TMS320F2810的直流无刷伺服电动机的位置控制系统。文中介绍了壳体翻滚系统的组成与原理,提出了一种轨迹规划的算法,分析了被控对象的特性,应用库仑摩擦模型补偿系统摩擦非线性,并对控制系统进行建模与仿真。实验分析表明壳体翻滚在匀速阶段速度为34~35 pulse/s;角度跟踪误差小于0.5%。文中以DSP TMS320F2810为核心实现两路壳体翻滚装置的数字控制,控制系统满足了陀螺仪壳体翻滚的技术指标要求。 相似文献
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