CRYSTAL CHEMICAL STUDY ON 90°DOMAIN SWITCHING PEROVSKITE TYPE FERROELECTRICS

90°畴变钙钛矿型铁电体的晶体化学研究

• 批准号: 10650663
• 负责人: TSURUMI Takaaki
• 金额: $ 2.3万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650663/
• 关键词: ferroelectrics; perovskite compounds; domain structures; lead titanate; laser interferometer; 結晶構造; リートベルト法

There are two domain structures, 180 degree domains and 90 degree domains, in tetragonal perovskite type ferroelectrics. The 90 degree domains can be reorientated by an external electric field. The 90 degree domain reorientation induces the changes in strain and polarization, therefore, it is very important to understand the behavior of the reorientation for practical application of ferroelectric materials. This study was carried out for the purpose of understanding crystal chemical characters dominating the 90 degree domain- reorientation behaviors in lead titanate (PT)-based materials and lead titanate-lead zirconate solid solutions (PZT).The relationship between the crystal structures and properties was investigated for (Pb, R)TiOィイD23ィエD2(R=Ca, Sr, Ba) ceramics with different tetragonarity (c/a ratio). It was found that the coercive field which determines the easiness of the domain-reorientation depended on the c/a ratio, while the spontaneous polarization was depended on the alkali earth elements incorporated into PT. The (Pb,Sr)TiOィイD23ィエD2 showed the largest spontaneous polarization in the three specimens with c/a ratio = 1.03. In order to understand the origin of the difference in the spontaneous polarization, the crystal structure analysis was carried out using the Rietveld method. The result of analysis indicated that the displacement of Ti ion from the ideal position of cubic perovskite structure was largest in (Pb, Sr)TiOィイD23ィエD2, which explained the large spontaneous polarization.The dynamic behavior of the 90 degree domain-reorientation in PZT ceramics was investigated from the measurement of the frequency dependence of electric field induced strains using a Mach-Zehnder type laser interferometer. It was found that the reorientation had a velocity limit and a piezoelectric relaxation was observed at ca. 10kHz. This method gave the information of the contribution of 90 degree domain reorientation to the piezoelectric strains.

四方钙钛矿型铁电体具有180度畴和90度畴两种结构。90度畴可以通过外电场重新定向。90度的畴重取向引起了铁电材料的应变和极化变化，因此，了解畴重取向的行为对铁电材料的实际应用具有重要意义。本研究旨在了解钛酸铅（PT）基材料和钛酸铅-锆酸铅固溶体（PZT）中主导90度畴重取向行为的晶体化学特征。研究了不同正方度（c/a比）（Pb， R） tio_ (R=Ca, Sr, Ba) D2（R=Ca, Sr, Ba）陶瓷晶体结构与性能的关系。结果表明：c/a比决定了PT的矫顽力场，而PT中加入的碱土元素则决定了PT的自发极化，当c/a比为1.03时，（Pb,Sr） tio_2的自发极化最大。为了了解自发极化差异的原因，采用Rietveld方法对晶体结构进行了分析。分析结果表明，在（Pb, Sr） tio_2中，Ti从立方钙钛矿结构的理想位置位移最大，这解释了自发极化大的原因。利用Mach-Zehnder型激光干涉仪测量了电场诱导应变的频率依赖性，研究了PZT陶瓷中90度畴重定向的动力学行为。结果表明，重定向具有速度极限，在约10kHz处观察到压电弛豫。该方法给出了90度畴重定向对压电应变的贡献信息。

项目成果

T.Tsurumi,N.Ikeda,K.Okamoto and N.Ohashi: "Domain Contribution in the Electric-Field-Induced Strain of PZT Ceramics Measured by a Mach-Zehnder Type Interferometer"Ferroelectrics. 224. 597-604 (2000)

T.Tsurumi、N.Ikeda、K.Okamoto 和 N.Ohashi：“通过马赫-曾德尔型干涉仪测量 PZT 陶瓷电场感应应变的磁畴贡献”铁电体。

T. Tsurumi, Y. Kumano, N. Ikeda, N. Ohashi and O. Fukunaga: "XRD Measurements of 90°Domain Reorientation and Domain Contribution to the Electric-Field-Induced Strain in pZT Ceramics"Key Engineering Materials. 157-158. 73-80 (1999)

T. Tsurumi、Y. Kumano、N. Ikeda、N. Ohashi 和 O. Fukunaga：“pZT 陶瓷中 90° 域重新取向和域对电场感应应变的贡献的 XRD 测量”关键工程材料 157-158。 .73-80 (1999)

Y. Kubota, N. Ohashi and T. Tsurumi N. Ohashi: "Terragonarity and Ferroelectricity of (Pb, R)TiO3(R=Ca, Sr,Ba)"Ceramixs Kiso-kagaku Toron-kai, Ext. Abstract. 28-29 (1999)

Y. Kubota、N. Ohashi 和 T. Tsurumi N. Ohashi：“(Pb, R)TiO3(R=Ca, Sr,Ba) 的方晶性和铁电性”Ceramixs Kiso-kagaku Toron-kai，分机。

T. Tsurumi, N. Ikeda, K. Okamoto and N. Ohashi: "Domain Contribution in the Electric-Field-Induced Strain of PZT Ceramics Measured by a Mach-Zehnder Type Interferometer"Ferroelectrics. 224. 597-604 (2000)

T. Tsurumi、N. Ikeda、K. Okamoto 和 N. Ohashi：“通过马赫-曾德尔型干涉仪测量 PZT 陶瓷电场感应应变的磁畴贡献”铁电体。

窪田陽一、大橋直樹、鶴見敬章: "(Pb,R)TiO3(R=Ca,Sr,Ba)のテトラゴナリティーと強誘電性"セラミックス基礎科学討論会 講演要旨集. 28-29 (1999)

Yoichi Kubota、Naoki Ohashi、Takaaki Tsurumi：“(Pb,R)TiO3(R=Ca,Sr,Ba) 的四方性和铁电性”陶瓷基础科学会议摘要 28-29 (1999)。