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bluesky1803木虫 (小有名气)
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[交流]
【讨论】The effect of grain size
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| Recently, The effect of grain size of ferroelectric ceramics has been investigated widely, but the mechanism of it isn't studied clearly.I want to talk about it with you !! |
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mse507
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2楼2009-08-01 13:03:28
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3楼2009-08-05 11:10:42
4楼2009-08-05 20:16:27
5楼2009-08-05 21:44:19
ceramic
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小木虫(金币+0.5):给个红包，谢谢回帖交流
小木虫(金币+0.5):给个红包，谢谢回帖交流
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Size Effect of Barium Titanate and Computer-Aided Design of Multilayered Ceramic Capacitors Tsurumi, T. Hoshina, T. Takeda, H. Mizuno, Y. Chazono, H. This paper appears in: Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on Publication Date: August 2009 Volume: 56, Issue: 8 On page(s): 1513-1522 ISSN: 0885-3010 Digital Object Identifier: 10.1109/TUFFC.2009.1214 Current Version Published: 2009-07-31 Abstract The size effect of BaTiO3 (BTO) is the most important issue to design multilayer ceramic capacitors (MLCCs) with high capacitance. In the size effect of BTO particles, the size dependence of dielectric permittivity related with the complex structure in BTO nano-particles. The grain size dependence of dielectric permittivity in BTO ceramics was due to the domain wall contribution. The core-shell structure played an important role in the size effect of dielectric layers in X7R-MLCCs. Computer simulation technique was developed to predict the limit of capacitance density of MLCCs produced by the current technology. Dielectric properties of MLCCs with different particle size of BTO were measured, and the data were analyzed using B-SPLINE fitting to predict dielectric permittivity at arbitrary temperatures and AC-fields. The dielectric properties of barium titanate grains smaller than 100 nm were predicted using least squares fitting of the B-SPLINE coefficients. It was found from the simulation that the use of barium titanate grains smaller than 80 nm did not give an advantage to increase the capacitance density as well as temperature stability of the MLCCs. The maximum capacitance was predicted for the 1608 (mm) chip size. |
6楼2009-08-05 22:35:39
markblue
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7楼2009-08-05 22:49:49
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8楼2009-08-06 12:02:32
ceramic
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here is the link. Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on Publication Date: August 2009 Volume: 56, Issue: 8 On page(s): 1513-1522 ISSN: 0885-3010 Digital Object Identifier: 10.1109/TUFFC.2009.1214 Current Version Published: 2009-07-31 it is a IEEE UFFC journal paper |
9楼2009-08-06 16:56:19
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Effects of grain size on domain structure and ferroelectric properties of barium zirconate titanate ceramics Wei Cai, Chunlin Fua, Jiacheng Gaob and Huaqiang Chen School of Metallurgical and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China bSchool of Materials Science and Engineering, Chongqing University, Chongqing 400044, China Received 11 September 2008; revised 14 February 2009; accepted 18 February 2009. Available online 26 February 2009. Abstract Barium zirconate titanate (BaZr0.2Ti0.8O3, short for BZT) ceramics were prepared by conventional ceramic method, and the effect of grain size on domain structure and ferroelectric properties were studied by XRD, scanning electron microscopy (SEM) and LC material analyzer. It is found that BaZr0.2Ti0.8O3 ceramics is of perovskite crystal structure. As the sintering time increased from 0.5 h to 2 h, 4 h and 8 h, the average grain size of BZT ceramics increased from 25 μm to 40 μm, 45 μm and 80 μm. It is shown that the grain size influences on the types of domains of BaZr0.2Ti0.8O3 ceramics, and 90°-domain has not been observed in large grain size sample. Moreover, domains with herribone, lamellar and “water-mark” characters are observed. The coercive electric field decreases and the remanent polarization increases as the grain size of BZT ceramics increases. Keywords: Barium zirconate titanate; Ceramics; Domain; Grain size; Hysteresis loop Article Outline 1. Introduction 2. Sample preparation and experimental details 3. Results and discussions 3.1. Crystal structure 3.2. Domain structure 3.3. Hysteresis loop 4. Conclusions Acknowledgements References 1. Introduction Barium titanate (BaTiO3) is the most common ferroelectric oxide in the perovskite ABO3 structure. BaTiO3 is widely used as a capacitor because of its high dielectric constant. In order to reduce the dielectric loss at low frequencies, SrO or ZrO2 was used as a dopant. Barium strontium titanate (BaxSr1−xTiO3, short for BST) has high dielectric constant, low leakage current and low dielectric dispersion against frequency [1], [2], [3], [4] and [5]. However, the leakage current often abruptly turns up in orders of magnitude as the applied field exceeds a critical value of several hundreds kV/cm, and breakdown occurs at a field around 2 MV/cm [4] and [5]. Barium zirconate titanate (BaZrxTi1−xO3, short for BZT) has attracted immense attention for their potential applications for the microwave technology, due to their high dielectric constant, low dielectric loss, and large tunability compared with BST, because the Zr4+ ion (0.087 nm) is chemically more stable than the Ti4+ (0.068 nm) and has a larger ionic size to expand the lattice. Therefore, the conduction by electron hopping between Ti4+ and Ti3+ would be depressed by the substitution of Ti with Zr [6], [7], [8], [9], [10], [11], [12] and [13]. Ferroelectrics are characterized by ferroelectric domain. Ferroelectric properties are mainly controlled by the ferroelectric domain structures and their evolution. Therefore, study of ferroelectric domain structure is of both fundamental interest and technological importance and is expected to provide clues to modify ferroelectric properties. Many efforts, including theoretical and experimental, have been taken to study ferroelectric domain structure in the ceramics and thin films [14] S. Tsurekawa, K. Ibaraki and K. Kawahara et al., Scripta Mater. 56 (7) (2007), pp. 557–580.[14], [15] and [16]. BZT is a new microwave ferroelectric material, its domain structures have compound effect on ferroelectric properties. But ferroelectric domain structures of BZT ceramics have not been investigated. In this paper, the grain size effect on the domain structure and ferroelectric properties of BaZr0.2Ti0.8O3 ceramics were investigated. |
10楼2009-09-11 12:47:16
