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Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics最新文献

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Preparation of epitaxial LiNbO/sub 3/ films by the sol-gel method 溶胶-凝胶法制备外延LiNbO/ sub3 /薄膜
K. Terabe, N. Iyi, H. Uematsu, I. Sakaguchi, Yasuhiro Matsui, K. Kitamura, S. Kimura
The effect of substrates on the crystallinity and interdiffusion behaviors in sol-gel derived LiNbO/sub 3/ films were investigated using X-ray diffraction, transmission electron microscopy and secondary ion mass spectroscopy. The epitaxial films were obtained on (0001)-sapphire, (0001)-LiTaO/sub 3/ and (0001)-5%MgO doped LiNbO/sub 3/ substrates with similar crystal structures, but with a variety of lattice constants. When sapphire, which has the largest lattice mismatch with the film, was used, the resulting films heat-treated at 500/spl deg/C showed a low degree of crystallinity. On the other hand, the films on LiTaO/sub 3/ and 5% MgO doped LiNbO/sub 3/, which have smaller lattice mismatches, showed better degrees of crystallinity. Furthermore, these epitaxial films were formed without serious interdiffusion. Our study shows LiNbO/sub 3/ films, for the practical application such as optical waveguides, can be prepared by the sol-gel method using a substrate with a small lattice mismatch.
利用x射线衍射、透射电子显微镜和二次离子质谱研究了衬底对溶胶-凝胶法制备LiNbO/ sub3 /薄膜结晶度和互扩散行为的影响。在(0001)-蓝宝石、(0001)-LiTaO/sub 3/和(0001)-5%MgO掺杂的LiNbO/sub 3/衬底上获得了晶体结构相似但晶格常数不同的外延薄膜。当使用与薄膜晶格失配最大的蓝宝石时,得到的薄膜在500/spl℃下热处理,结晶度较低。另一方面,LiTaO/sub 3/和5% MgO掺杂的LiNbO/sub 3/薄膜的晶格错配较小,结晶度较好。此外,这些外延膜的形成没有严重的相互扩散。我们的研究表明,LiNbO/ sub3 /薄膜可以通过溶胶-凝胶法在晶格失配较小的衬底上制备,用于光学波导等实际应用。
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引用次数: 0
Processing and characterization of samarium and manganese modified lead titanate thin film 钐锰改性钛酸铅薄膜的制备与表征
C. Fan, W. Huebner
Samarium and manganese modified lead titanate thin films were fabricated by spin-coating an amorphous citrate precursor. These films transformed into an oxide film upon heat treatment at 400/spl deg/C or above. Relatively large area and crack-free thin films could be obtained by this process both easily and inexpensively. The rheological behavior of the precursor solution, as well as its thermal decomposition and phase development were studied by means of DSC/TGA and XRD. The thickness and grain size of the oxide film were examined by TEM and SEM.
以无定形柠檬酸盐为前驱体,采用自旋涂覆法制备了钐锰改性钛酸铅薄膜。这些薄膜在400°C或更高的温度下热处理后转变成氧化膜。该方法可制备面积较大、无裂纹的薄膜,制备方法简单,成本低。采用DSC/TGA和XRD研究了前驱体溶液的流变行为、热分解和相发育过程。采用透射电镜和扫描电镜对氧化膜的厚度和晶粒尺寸进行了表征。
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引用次数: 0
Dielectric, Piezoelectric, and Pyroelectric Properties of Barium-Modified Lead Magnesium Tantalate-L 钡改性钽酸铅镁- l的介电、压电和热释电性质
S. Choi, J. W. Jung
46stract Dielectric, piezoelectric and pyroelectric properties of relaxor ferroelectrics in the 0. 65Pbl..Ba, (Mg1,3Ta2,3)03-0, 35PbTi03 solid solution series have been investigated. The dielectric constant and loss of ceramic samples were determined. The piezoelectric d33 constant and electromechanical coupling factor were measured for various compositions in the Ba-doping PMT-PT ceramics, The pyroelectric coefficient and spontaneous polarization were measured by the static Byer-Roundy method as a function of temperature. The values of dielectric constant, electromechanical coupling factor and pyroelectric coefficient for Ba-doped PMT-PT are much larger compared to the values observed for the undoped PMT-PT ceramics. Ba-doping also shifted the Tc downward, approximately 6 ‘C/mol% additon of Ea. Further additions of Ba could be used to shift the Tc downward without significantly changing the dielectric behav i or.
摘要:研究了弛豫铁电体的介电、压电和热释电性质。65年出版广播公司. .研究了Ba, (Mg1, 3ta2,3)03-0, 35PbTi03固溶体系列。测定了陶瓷样品的介电常数和损耗。采用静态Byer-Roundy法测量了不同成分ba掺杂PMT-PT陶瓷的压电d33常数和机电耦合系数,并测量了热释电系数和自发极化随温度的变化规律。掺ba的PMT-PT陶瓷的介电常数、机电耦合系数和热释电系数比未掺ba的PMT-PT陶瓷大得多。Ba掺杂也使Tc下降,Ea的添加量约为6′C/mol%。进一步添加Ba可以使Tc下降,而不会显著改变介电行为。
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引用次数: 0
Electrically-induced shape changes in cement-based materials 电致水泥基材料的形状变化
Hua Ai, Jiefang Li, D. Viehland
The electromechanical behavior of hardened portland cement paste has been investigated as a function of measurement frequency and DC electrical bias using an interferometric technique. Large field induced shape changes on the order of 100 A have been found in millimeter thick specimens exposed to moisture. In addition, strong hysteresis effects were found on cycling a large AC field. Dry samples were found to exhibit no field-induced deformations. The mechanism underlying this anomalous behavior is believed to be an electro-osmotically induced swelling of the pore structures. Evidence in support of this hypothesis was found by corresponding investigations of porous silica gels.
采用干涉测量技术研究了硬化波特兰水泥膏体的机电性能与测量频率和直流偏压的关系。在暴露于湿气中的毫米厚试样中发现了100 A左右的大电场诱导形状变化。此外,在大交流磁场循环时发现了强磁滞效应。干燥样品被发现没有表现出场致变形。这种异常行为的机制被认为是电渗透诱导的孔隙结构膨胀。通过对多孔硅胶的相应研究,发现了支持这一假设的证据。
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引用次数: 0
Dielectric properties of strontium and lead based complex perovskite ceramics 锶-铅基复合钙钛矿陶瓷的介电性能
S. Gridnev, N.G. Pavlova, S. P. Rogova, L. Korotkov, V.V. Zaentsev
The dielectric properties and structure of the complex perovskite ceramics (0.7PbZrO/sub 3/-0.3K/sub 0.5/Bi/sub 0.5/TiO/sub 3/)+xSrTiO/sub 3/ have been investigated in the temperature range from 283 K to 333 K with the intention of understanding a change of a sign which occurs in the temperature coefficient of the capacitance at x/spl sime/0.5.
本文研究了复合钙钛矿陶瓷(0.7PbZrO/sub 3/-0.3K/sub 0.5/Bi/sub 0.5/TiO/sub 3/)+xSrTiO/sub 3/的介电性能和结构,在283 ~ 333 K的温度范围内,了解了x/spl sime/0.5时电容温度系数的符号变化。
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引用次数: 1
A simple unified analytical model for ferroelectric thin film capacitor and its applications for nonvolatile memory operation 铁电薄膜电容器的简单统一分析模型及其在非易失性存储器中的应用
D. Chen, M. Azuma, L. Mcmillan, C. A. Paz de Araújo
A simple unified analytical ferroelectric model has been developed based on an effective field assumption and statistical physics, which covers ferroelectric hysteresis, switching, and phase transitions including first and second order phase transitions as well as Curie-Weiss law. The model parameters may be extracted from measured data using commercial customizable optimization tools such as SmartSpice's Optimizer. The model can be used for modeling, simulation and statistical process control for ferroelectric nonvolatile memory design and fabrication.
基于有效场假设和统计物理,建立了一个简单的统一分析铁电模型,该模型涵盖了铁电滞后、开关、相变(包括一阶和二阶相变)以及居里-魏斯定律。可以使用商业定制优化工具(如SmartSpice的Optimizer)从测量数据中提取模型参数。该模型可用于铁电非易失性存储器设计和制造的建模、仿真和统计过程控制。
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引用次数: 8
Structural and thermal study of Pb(Zr,Ti,Ce)O/sub 3/ ceramics Pb(Zr,Ti,Ce)O/sub - 3/陶瓷的结构和热研究
E. Ching-Prado, W. Pérez, R. Katiyar, A. Garg, D. C. Agrawal
Solid solution having compositions Pb[Zr/sub x-y/Ce/sub y/Ti/sub 1-x/]O/sub 3/ with y=0.0, 0.001, 0.00125, and 0.02 were studied. The samples were prepared from sintered oxides. XRD measurements indicate a mixture of rhombohedral and tetragonal phases in all the samples, where the tetragonal phase increases with increasing CeO/sub 2/ concentration. Also, the c/a ratio of the tetragonal structure was found to increase with increasing CeO/sub 2/, content. Precipitation of cerium oxide was observed for the sample with y=0.02, showing that the solubility of CeO/sub 2/ in lead zirconate is lower than 2%. Raman scattering measurements confirm that all the samples are perovskite in structure, but inhomogeneities were found. The strong line around 465 cm/sup -1/, corresponding to F/sub 2g/ symmetry, shows the presence of cerium oxide in the sample with y=0.02. Finally, DSC measurements show that the Curie temperature decreases with increasing CeO/sub 2/ content.
研究了组分Pb[Zr/sub - x-y/Ce/sub -y/ Ti/sub - 1-x/]O/sub - 3/, y=0.0、0.001、0.00125和0.02的固溶体。样品由烧结氧化物制备。XRD测试结果表明,样品中存在菱面体相和四方相的混合物,其中四方相随着CeO/sub 2/浓度的增加而增加。同时发现,随着CeO/sub 2/含量的增加,四边形结构的c/a比也随之增加。y=0.02时,样品中有氧化铈析出,表明CeO/sub 2/在锆酸铅中的溶解度低于2%。拉曼散射测量证实所有样品在结构上都是钙钛矿,但发现了不均匀性。在465 cm/sup -1/附近的强线,对应于F/sub 2g/对称性,表明样品中存在氧化铈,y=0.02。DSC测量结果表明,居里温度随CeO/sub 2/含量的增加而降低。
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引用次数: 0
Processing and characterization of ferroelectric thin films in the Pb/sub 5/Ge/sub 3/O/sub 11/-PbZr/sub 0.5/Ti/sub 0.5/O/sub 3/ system Pb/sub 5/Ge/sub 3/O/sub 11/-PbZr/sub 0.5/Ti/sub 0.5/O/sub 3/体系中铁电薄膜的制备与表征
S. M. Landin, M. J. Haun
This work investigates the crystallization of pure Pb/sub 5/Ge/sub 3/O/sub 11/ (PG) and composition in the Pb/sub 5/Ge/sub 3/O/sub 11/-PbZr/sub 0.5/Ti/sub 0.5/O/sub 3/ (PG-PZT) system. PG is of interest due to its low processing temperatures and possible application as pyroelectric sensors and nonvolatile ferroelectric memories. Compositions in the PG-PZT system crystallize to form multiple ferroelectric phases at relatively low temperatures, potentially offering a unique combination of ferroelectric properties and processing conditions. Ferroelectric thin films in the PG-PZT system were fabricated on (111) Pt-coated silicon substrates using sol gel processing techniques. Rapid thermal processing was utilized to investigate the time/temperature dependencies of crystallization, phase transformations and orientation of both Pb/sub 5/Ge/sub 3/O/sub 11/ and PbZr/sub 0.5/Ti/sub 0.5/O/sub 3/. Pb/sub 5/Ge/sub 3/O/sub 11/ films with a thickness of 2000 /spl Aring/ crystallized with a c-axis orientation of greater than 90% when heat treated at 700/spl deg/C for 30 seconds.
本文研究了纯Pb/sub - 5/Ge/sub - 3/O/sub - 11/ (PG)的结晶及其在Pb/sub - 5/Ge/sub - 3/O/sub - 11/-PbZr/sub - 0.5/Ti/sub - 0.5/O/sub - 3/ (PG- pzt)体系中的组成。由于其加工温度低,可能应用于热释电传感器和非易失性铁电存储器,因此对PG感兴趣。PG-PZT体系中的成分在相对较低的温度下结晶形成多个铁电相,可能提供铁电性能和加工条件的独特组合。采用溶胶-凝胶工艺在(111)pt包覆的硅衬底上制备了PG-PZT体系的铁电薄膜。利用快速热处理技术研究了Pb/sub 5/Ge/sub 3/O/sub 11/和PbZr/sub 0.5/Ti/sub 0.5/O/sub 3/的结晶、相变和取向的时间/温度依赖性。在700/spl℃下热处理30秒,得到了厚度为2000 /spl的Pb/sub 5/Ge/sub 3/O/sub 11/薄膜,其C轴取向大于90%。
{"title":"Processing and characterization of ferroelectric thin films in the Pb/sub 5/Ge/sub 3/O/sub 11/-PbZr/sub 0.5/Ti/sub 0.5/O/sub 3/ system","authors":"S. M. Landin, M. J. Haun","doi":"10.1109/ISAF.1994.522404","DOIUrl":"https://doi.org/10.1109/ISAF.1994.522404","url":null,"abstract":"This work investigates the crystallization of pure Pb/sub 5/Ge/sub 3/O/sub 11/ (PG) and composition in the Pb/sub 5/Ge/sub 3/O/sub 11/-PbZr/sub 0.5/Ti/sub 0.5/O/sub 3/ (PG-PZT) system. PG is of interest due to its low processing temperatures and possible application as pyroelectric sensors and nonvolatile ferroelectric memories. Compositions in the PG-PZT system crystallize to form multiple ferroelectric phases at relatively low temperatures, potentially offering a unique combination of ferroelectric properties and processing conditions. Ferroelectric thin films in the PG-PZT system were fabricated on (111) Pt-coated silicon substrates using sol gel processing techniques. Rapid thermal processing was utilized to investigate the time/temperature dependencies of crystallization, phase transformations and orientation of both Pb/sub 5/Ge/sub 3/O/sub 11/ and PbZr/sub 0.5/Ti/sub 0.5/O/sub 3/. Pb/sub 5/Ge/sub 3/O/sub 11/ films with a thickness of 2000 /spl Aring/ crystallized with a c-axis orientation of greater than 90% when heat treated at 700/spl deg/C for 30 seconds.","PeriodicalId":20488,"journal":{"name":"Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics","volume":"16 1","pages":"468-471"},"PeriodicalIF":0.0,"publicationDate":"1994-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88740923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Switching in ferroelectric thin films: how to extract information about domain kinetics from traditional current data 铁电薄膜中的开关:如何从传统电流数据中提取有关畴动力学的信息
V. Shur, E. L. Rumyantsev, S. Makarov, V. V. Volegov
In this paper we demonstrate the possibility of extracting original detail information about domain kinetics during polarization reversal in thin ferroelectric films from the switching current data. The developed method of mathematical treatment was verified by computer simulations and direct experiments in model ferroelectric single crystals.
在本文中,我们证明了从开关电流数据中提取铁电薄膜极化反转过程中畴动力学原始细节信息的可能性。通过铁电单晶模型的计算机模拟和直接实验验证了所建立的数学处理方法。
{"title":"Switching in ferroelectric thin films: how to extract information about domain kinetics from traditional current data","authors":"V. Shur, E. L. Rumyantsev, S. Makarov, V. V. Volegov","doi":"10.1109/ISAF.1994.522457","DOIUrl":"https://doi.org/10.1109/ISAF.1994.522457","url":null,"abstract":"In this paper we demonstrate the possibility of extracting original detail information about domain kinetics during polarization reversal in thin ferroelectric films from the switching current data. The developed method of mathematical treatment was verified by computer simulations and direct experiments in model ferroelectric single crystals.","PeriodicalId":20488,"journal":{"name":"Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics","volume":"4 1","pages":"669-673"},"PeriodicalIF":0.0,"publicationDate":"1994-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88785663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Preparation of Bi/sub 4/Ti/sub 3/O/sub 12/ thin films by reactive magnetron sputtering using metal target and their evaluations 金属靶反应磁控溅射制备Bi/sub - 4/Ti/sub - 3/O/sub - 12/薄膜及其评价
T. Yamamoto, H. Matsuoka
As sputtered ferroelectric and [001] oriented Bi/sub 4/Ti/sub 3/O/sub 12/ thin films were prepared on a Pt/Ti/SiO/sub 2//Si substrate at a comparatively low temperature around 330 /spl deg/C, by a reactive magnetron sputtering using Bi and Ti metal target. The chemical composition of deposited film is determined by the multi-element structure of target designed by a sputtering yield of Bi and Ti, which was changed by the gas ratio of the Ar/sup +/ and O/sub 2/ and the value of input rf-power. Dielectric constant was 100 at 1 kHz. The remanent polarization and the coercive field were 7uC/cm/sup 2/ and 51.2 kV/cm, respectively.
采用反应磁控溅射的方法,在Pt/Ti/SiO/ sub2 //Si衬底上制备了[001]取向的Bi/sub 4/Ti/sub 3/O/sub 12/薄膜,温度较低,约为330 /spl℃。沉积膜的化学成分是由由Bi和Ti的溅射量设计的靶材的多元素结构决定的,而Ar/sup +/和O/sub 2/的气体比和输入rf功率的值会改变靶材的化学成分。在1khz时介电常数为100。残余极化和矫顽力场分别为7uC/cm/sup 2/和51.2 kV/cm。
{"title":"Preparation of Bi/sub 4/Ti/sub 3/O/sub 12/ thin films by reactive magnetron sputtering using metal target and their evaluations","authors":"T. Yamamoto, H. Matsuoka","doi":"10.1109/ISAF.1994.522409","DOIUrl":"https://doi.org/10.1109/ISAF.1994.522409","url":null,"abstract":"As sputtered ferroelectric and [001] oriented Bi/sub 4/Ti/sub 3/O/sub 12/ thin films were prepared on a Pt/Ti/SiO/sub 2//Si substrate at a comparatively low temperature around 330 /spl deg/C, by a reactive magnetron sputtering using Bi and Ti metal target. The chemical composition of deposited film is determined by the multi-element structure of target designed by a sputtering yield of Bi and Ti, which was changed by the gas ratio of the Ar/sup +/ and O/sub 2/ and the value of input rf-power. Dielectric constant was 100 at 1 kHz. The remanent polarization and the coercive field were 7uC/cm/sup 2/ and 51.2 kV/cm, respectively.","PeriodicalId":20488,"journal":{"name":"Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics","volume":"601 1","pages":"485-487"},"PeriodicalIF":0.0,"publicationDate":"1994-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77322684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics
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