THE STUDY ON FERROELECTRIC THIN FILM MATERIALS FOR NON-VOLATILE MEMORY

非易失性存储器铁电薄膜材料的研究

• 批准号: 06650375
• 负责人: OGAWA Toshio
• 金额: $ 1.09万
• 依托单位: SHIZUOKA INSTITUTE OF SCIENCE & TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06650375/
• 关键词: tetragonal PZT ceramics; poling field; ferroelectric domains; domain configuraion model; 90ﾟ rotation; 180ﾟ switching; planar coupling factor; frequency constant; 菱面体晶PZTセラミックス; 配向分極; 180°回転; 誘電・圧電特性; 正方晶系PZTセラミック; 配向電極; 90°ドメイン; 結晶配向度

Ferroelectric domain structures of tetragonal PZT ceramics were evaluated by the poling field (E) dependence of planar coupling factor (kp) and relative XRD intensity of (002) peak, I_<002>. We proposed typical domain configurations composed of 15 patterns. Furthermore, we picked out the two patterns to make a domain configuration model with 90ﾟ and 180ﾟ domains. It was thought that the change in the domain structure by poling could be explained to calculate the change in the area with the individula axis. Therefore, the total amount of the domains oriented to c axis was estimated by the relation between I_<002>, kp, normalized polarization and E.From our domain configuration model, it was confirmed that there were two peaks of 90ﾟ domain rotation and one peak of 180ﾟ domain rotation. After the 90ﾟ domain switching, the domains in c direction were changed mainly by 180ﾟ rotation. As a result, the 90ﾟ domain switching decreased and 180ﾟ domain switching increased. We believe our study on domain structures of bulk ceramics may be useful for understanding the degradation characteristics in PZT thin films.

通过极化电场(E)、平面耦合因子(Kp)和(002)峰的相对X射线衍射峰强度(I&lt；002&gt；)来评价四方PZT陶瓷的铁电畴结构。我们提出了由15个模式组成的典型域配置。此外，我们选择了这两种模式来构建包含90个ﾟ域和180个ﾟ域的域配置模型。认为极化引起的磁区结构的变化可以用来计算具有个体轴线的面积的变化。从我们的磁区构型模型中，我们确定存在两个90ﾟ的磁区旋转峰和一个180ﾟ的磁区旋转峰。在90ﾟ的磁区转换后，c方向的磁区主要发生180ﾟ的旋转。结果，90ﾟ域切换减少，180ﾟ域切换增加。我们相信，我们对块体陶瓷的磁畴结构的研究将有助于理解PZT薄膜的退化特性。

项目成果

A.Yamada, T.Ogawa M.Takahashi and Y.K.Chung: "Surface Characteristics of Tetragonal RZT Ceramics" Transactions of the Materials Research Society of Japan. 20. 603-606 (1996)

A.Yamada、T.Okawa M.Takahashi 和 Y.K.Chung：“四方 RZT 陶瓷的表面特性”日本材料研究会会刊。

T. Ogawa: "Evaluating and Controlling Ferroelectric Domain Structure in PZT Ceramics" Ferroelectrics. 169. 55-62 (1995)

T. Okawa：“评估和控制 PZT 陶瓷中的铁电畴结构” 铁电体。

T.Ogawa: "Fatigue-Free PZT Ceramic Materials" Proceedings of The 6th US-Japan Seminar on Dielectric and Piezoelectric Ceramics. 348-351 (1993)

T.Okawa：“无疲劳 PZT 陶瓷材料”第六届美日介电陶瓷和压电陶瓷研讨会论文集。

T. Ogawa, A. Yamada M. Takahashi, Y. K. Chung: "Crystal Orientation of Tetragonal Pb (Sn1/2 Sb1/2)O_3-PbTiO_3-PbZrO_3 Ceramics" Proceedings of the 7th US-Japan Seminar on Dielectric and Piezoelectric Ceramics. 141-144 (1995)

T. Okawa、A. Yamada M. Takahashi、Y. K. Chung：“四方 Pb (Sn1/2 Sb1/2)O_3-PbTiO_3-PbZrO_3 陶瓷的晶体取向”第七届美日介电和压电陶瓷研讨会论文集。

T.Ogawa, A.Yamada M.Takahashi and Y.K.Chung: "Annealing and Aging Characteristics of Tetragonal PZT Ceramic Surface" Proceedings of ELECTROCERAMICS. Vol.1. 177-180 (1996)

T.Okawa、A.Yamada M.Takahashi 和 Y.K.Chung：“四方 PZT 陶瓷表面的退火和老化特性”《ELECTROCERAMICS》论文集。