PZT 'composite' ferroelectric thick films
PZT 'composite' ferroelectric thick films
复制标题
DOI：
10.1016/s0955-2219(01)00260-6
复制
发表时间：
2002-03-01
影响因子：
5.7
通讯作者：
Perrin, C
中科院分区：
文献类型：
--
作者：
Corker, DL;Zhang, Q;Perrin, C
采用一种改进的溶胶-凝胶/陶瓷粉末复合技术，在低温下制备了锆钛酸铅陶瓷厚膜。在这个过程中，铁电粉末悬浮在相同成分的有机金属溶液中，使用旋涂技术将其沉积在金属或镀铂的硅衬底上。通过加入一种新型的Cu(2O)O/PbO液相烧结助剂，介电性能从450-680的值得到了改善。进行了流变学研究以监测有机金属溶液和复合悬浮液的老化情况。在41天的试验期内，有机金属溶液被证明保持稳定。测试进一步表明，溶液的稳定性可降至-20摄氏度。在大规模制造的运输过程中，可能会经历这样的低温。通过模拟像0-3复合材料这样的厚膜，我们知道电学性能随着粉液比的增大而增强。通过调整有机金属溶液的pH值，使悬浮颗粒上产生的Zeta电位增加，实现了这一必要的更大负载。这大大降低了复合悬浮液的粘度，从而允许更大的粉末装载量。这样，载药量可达2.5g/ml。在16微米厚的薄膜上测得最佳介电常数和损耗分别高达680和0.01，在1.6V/微米电压下的相关自发极化为19.8微米/厘米(2)。(C)2001爱思唯尔科学有限公司。保留所有权利。
Thick-films of lead zirconate titanate ceramic have been fabricated at low-temperature using a modified sol-gel/ceramic powder technology termed the composite technique. In this process, a ferroelectric powder is suspended in an organometallic solution of the same composition, which is deposited either on metallic or platinised silicon substrates using spin-coating. Dielectric properties have been improved from values around 450-680 by incorporating a novel Cu(2)O/PbO liquid-phase sintering aid. Rheology studies were carried out to monitor ageing of both the organometallic solution and composite suspension. Over a trial period of 41 days, the organometallic solution was shown to remain stable. Tests further indicated solution stability down to -20 degreesC. Such low temperatures may be experienced during transportation in large-scale manufacturing. By modelling such thick films as 0-3 composites, it is known that electric properties are enhanced with greater powder:solution ratio. This necessary greater loading has been achieved by adjusting the pH of the organometallic solution, allowing the zeta-potential developed on suspended particles to be increased. This considerably lowers the viscosity of the composite suspension and hence allows much greater powder loading. In this way, loadings of up to 2.5 g/ml have been achieved. Optimum permittivities and losses in sintered films of up to 680 and 0.01 have been measured on films 16 mum thick, with associated spontaneous polarisation of 19.8 muC/cm(2) with 1.6 V/mum applied. (C) 2001 Elsevier Science Ltd. All rights reserved.