Processing, structure, properties, and applications of PZT thin films

被引:368
作者
Izyumskaya, N. [1 ,2 ]
Alivov, Ya. [1 ,2 ]
Cho, S. -J. [1 ,2 ]
Morkoc, H. [1 ,2 ]
Lee, H.
Kang, Y. -S.
机构
[1] Virginia Commonwealth Univ, Dept Elect & Comp Engn, Richmond, VA 23284 USA
[2] Virginia Commonwealth Univ, Dept Phys, Richmond, VA 23284 USA
关键词
PZT; thin films; ferroelectricity; piezoelectricity; pyroelectricity; sol-gel; PLD; MOCVD; MBE; ferroelectric devices;
D O I
10.1080/10408430701707347
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
There has been a resurgence of complex oxides of late owing to their ferroelectric and ferromagnetic properties. Although these properties had been recognized decades ago, the renewed interest stems from modern deposition techniques that can produce high quality materials and attractive proposed device concepts. In addition to their use on their own, the interest is building on the use of these materials in a stack also. Ferroelectrics are dielectric materials that have spontaneous polarization in certain temperature range and show nonlinear polarization-electric field dependence called a hysteresis loop. The outstanding properties of the ferroelectrics are due to non-centro-symmetric crystal structure resulting from slight distortion of the cubic perovskite structure. The ferroelectric materials are ferroelastic also in that a change in shape results in a change in the electric polarization (thus electric field) developed in the crystal and vice versa. Therefore they can be used to transform acoustic waves to electrical signal in sonar detectors and convert electric field into motion in actuators and mechanical scanners requiring fine control. In a broader sense the ferroelectric materials can be used for pyroelectric and piezoelectric sensors, voltage tunable capacitors, infrared detectors, surface acoustic wave (SAW) devices, microactuators, and nonvolatile random-access memories (NVRAMs), including the potential production of one transistor memory cells, and applications requiring nonlinear optic components. Another set of potential applications seeks to exploit the ferroelastic properties in stacked templates where they are juxtaposed to ferromagnetic materials. Doing so would allow the control of magnetic properties with electric field, which is novel. Such templates taking advantage two or more properties acquired a new name and now goes by multiferroics. After a brief historical development, this article discusses technological issues such as growth and processing, electrical and optical properties, piezo, pyro, and ferroelectric properties, degradation, measurements methods, and application of mainly lead-zirconate-titanate (PZT = PbZr1-xTixO3). The focus on PZT stems from its large electromechanical constant, large saturation polarization and large dielectric constant.
引用
收藏
页码:111 / 202
页数:92
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