Present situation of tourmaline research and development on the effect of spontaneous polarization 电气石自发极化特性的研究及发展现状
The strong periodic surface electric strength caused by spontaneous polarization may be used as an undulator instead of Wiggler magnet to produce free electron laser. 铁电单晶体自发极化引起的强周期性表面电场可能用来代替Wiggler磁铁产生自由电子激光。但落在铁电晶体表面上的自由电子将逐渐把表面势屏蔽掉。
The theory indicated that the process of ferroelectric phase transition was involved in the excitation of screen charges and their slow diffusion on the interface, till the homogeneous spontaneous polarization appears within each electric domain. 理论表明铁电相变过程涉及屏蔽电荷的激发及其在界面的缓慢扩散,以最后得出各个电畴内部的均匀自发极化。
By using the boundary condition given by the spontaneous and piezoelectric polarization, the Schrodinger Poisson equations in AlGaN/ GaN heterostructures are solved self consistently, from which the heterostructure band and its two dimensional electron gases are obtained. 应用AlGaN/GaN异质结中的压电极化和自发极化边界条件自洽求解了薛定谔方程和泊松方程,求出了异质结能带和二维电子气分布。
The spontaneous polarization and phase transition in order-disorder ferroelectric crystal was studied using Monte Carlo computer simulation. Our study has been developed in the framework of the X Y model with nearest neighbor interaction. 采用XY模型和蒙特卡罗方法对有序无序型铁电体的自发极化行为以及相变特征进行了计算机模拟研究,得到了与实验报道及理论研究符合良好的结果。
The nonuniqueness of spontaneous deformations and of directions in spontaneous polarization, and the inevitable existence of various singular surfaces in polycrystal materials cause the spontaneous configuration of ferroelectric ferroelastic materials to have intricate structures. 铁电材料在自极化过程中自变形和自极化方向的不唯一性,以及多晶材料中存在各种不同方向晶界的不可避免性,使得其自极化稳定构形具有极其复杂的结构。
Only series 1 of all the vibrational modes causes the change of the dipole moment of PVDF molecule, and is related to the spontaneous polarization. 其中只有系列Ⅲ能改变分子的电偶极矩,该系列振动模式和β相的PVDF的自发极化有着密切的关系。
Properties of Nonlinear Optical Rectification in Nitride Semiconductor Coupling Quantum Wells: Effects of Piezoelectricity and Spontaneous Polarization 氮化物半导体耦合量子阱中非线性光整流特性:压电效应与自发极化效应
It was proved tha ( d) 3M2CPOOB is ferroelectric liquid crystal with large spontaneous polarization. Its response time reaches the order of μ-sec. 测定了3M2-CPOOB的响应时间、倾斜角、电滞回线、自发极化率等物性参数,证明其是一个低温、宽温程、大自发极化率的铁电液晶,响应时间达微秒级。
The characteristics of the Schottky barrier at grain boundaries in polycrystal-line ferroelectric semiconductors are discussed on the basis of the screening mechanism of spontaneous polarization to the surface state charges. 本文从自发极化对表面态电荷屏蔽的机制出发,讨论多晶铁电半导体晶界处肖特基势垒的特征,并作了数值估算。
The simulation results show that the response velocity quickens as spontaneous polarization increases and rotational viscosity as well as thickness of liquid crystal film decreases. 实验结果表明:调制速率随自发极化强度的提高而增加,随转动粘滞系数、液晶薄膜厚度的提高而减慢。
Experimental results show that the continuous pyroelectric conversion cycle can be directly realized under the proper conditions without the loss of spontaneous polarization. 实验结果表明:在避免失去自发极化的适宜工况条件下,可以直接实现连续的热释电转换循环;
This BMF coexists with the spontaneous, polarization P3. 这一电动势与晶体的自发极化Ps同时存在。
A new principle for free electron lasers is proposed for the first time by using very strong surface periodic potential caused by the spontaneous polarization of ferroelectric single crystals. 本文利用铁电晶体自发极化产生的强大周期性表面势,首次提出新的自由电子激光原理。
Synthesis of Ferroelectric Liquid Crystals with Large Spontaneous Polarization and Study of their Properties 手性液晶的研究X.强极性铁电液晶的合成及其性能
The existence of domain walls reduces both the spontaneous polarization and the Curie temperature, and increases the critical size. 畴壁的存在使自发极化和居里温度降低,使临界尺寸增大。
Permanent Spontaneous Polarization of Tourmaline and its Application to Environment and Health Field 电气石的自发极化效应在环境与健康领域的应用
Spontaneous Polarization of SrTiO_3 at Low Temperature 钛酸锶(SrTiO3)低温时的自发极化
The measurement of pyroelectric property is shown that the spontaneous polarization, pyroelectric coefficience and pyroelectric merit are large than that of pure TGS crystal. 热释电性能测试表明,晶体的自发极化、热释电系数和热释电优值大于纯态的TGS。
The spontaneous polarization is an important feature of ferroelectrics. 铁电体的自发极化是铁电材料的一个重要特性。
Through bifurcations, the system enters into the spontaneous spin polarization regime from the Rabi regime. 通过分岔,系统从Rabi机制进入自发自旋极化机制。
The spontaneous polarization along the c-axis will affect the structural, optical, electrical, and chemical properties of ZnO thin films and nano-structures. 纤锌矿结构的ZnO晶体沿着c轴方向具有极性,自发极化对ZnO的光电性能、化学性质等都有重要影响。
Through comparing the dielectric force and the force between the spontaneous polarization and the electric field, the fast response mechanism of the ferroelectric liquid crystal is clear. 分析了铁电液晶响应过程中的介电力和自发极化与电场之间的作用力大小,明确了铁电液晶快速响应特点的响应机制。
These phenomena are different from those only are determined by the parameters, we name them as conditional bifurcation and conditional spontaneous spin polarization. 这些现象不同于那些只依赖于系统参数的分岔和自发自旋极化现象,是条件分岔和条件自发自旋极化。
The creation of defects does not change the spontaneous polarization of the system significantly, and the polarization reversal also changes little. 同时,这些缺陷的产生并不显著改变体系的自发极化强度,对体系的极化翻转过程也基本没有影响。
The BHT film showed a significant anisotropy of the ferroelectric polarization, and the spontaneous polarization remains along the a-axis. BHT薄膜表现出显著的铁电极化各向异性,主要自发极化发现仍沿a轴方向。
Spontaneous polarization and piezoelectric polarization exist in polar ZnO-based heterojunction. As a result, the luminescence efficiency of ZnO-based device would decrease and the luminescent wavelength would redshift. 极性ZnO基异质结中存在自发极化和压电极化现象,将会导致器件发光效率降低和发光波长红移。
The ferroelectricity means the spontaneous polarization that exists in some materials, and the spontaneous polarization can change its direction when the external electric field alters. 铁电性是指某些物质存在自发电极化现象,并且自发极化矢量取向能随着外电场而改变。
In-plane shear strain increases the in-plane spontaneous polarization but reduces the out-of-plane spontaneous polarization. 切应变会增加平面内的自发极化但是降低了平面外自发极化。