高密度CaCu3Ti4O12陶瓷的介电性质

doi:10.3724/SP.J.1077.2014.13050

无机材料学报 ›› 2014, Vol. 29 ›› Issue (1): 67-70.DOI: 10.3724/SP.J.1077.2014.13050

高密度CaCu₃Ti₄O₁₂陶瓷的介电性质

郝文涛^{1, 2}, 张家良³, 徐攀攀³, 曹恩思^{1, 2}, 彭华^{1, 2}

(1. 太原理工大学新型传感器与智能控制教育部重点实验室, 太原 030024; 2. 太原理工大学物理与光电工程学院, 太原 030024; 3. 山东大学物理学院, 济南 250100)

收稿日期:2013-01-21 修回日期:2013-03-07 出版日期:2014-01-20 网络出版日期:2013-12-09

Dielectric Property of High Density CaCu₃Ti₄O₁₂ Ceramics

HAO Wen-Tao^{1, 2}, ZHANG Jia-Liang³, XU Pan-Pan³, CAO En-Si^{1, 2}, PENG Hua^{1, 2}

(1. Key Laboratory of Advanced Transducers and Intelligent Control Systems, Taiyuan University of Technology, Taiyuan 030024, China; 2. College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China; 3. School of Physics, Shandong University, Jinan 250100, China)

Received:2013-01-21 Revised:2013-03-07 Published:2014-01-20 Online:2013-12-09

摘要/Abstract

摘要： 利用热压方法制备了高密度的CaCu₃Ti₄O₁₂陶瓷, 研究了其微观结构、晶格结构和介电性质。实验发现, 短时间热压方法制备的陶瓷的相对密度就能达到98.3%, 并且微观结构呈现晶粒尺寸双峰分布的特点。XRD显示热压方法制备的陶瓷中含有少量的Cu₂O第二相, 而经过退火处理的热压陶瓷则只含有CuO第二相。热压方法制备的陶瓷和经过退火处理的热压陶瓷的室温介电频谱上有两个介电弛豫, 而常规方法制备的陶瓷只有一个。并且热压方法制备的陶瓷的低频介电常数高达2×10⁵, 经过退火处理的热压陶瓷的低频介电常数更是达到1×10⁶。本研究进一步讨论了其微观结构和介电性质之间的关系。

关键词: 热压方法, CaCu₃Ti₄O₁₂, 微观结构, 介电性质

Abstract: High density CaCu₃Ti₄O₁₂ ceramics was prepared by the hot-press sintering technique, and their microstructure, crystalline structure and dielectric property were investigated. The hot-pressed ceramics exhibit the microstructure of bimodal grain distribution with a high theoretical relative density of 98.3%. X-ray diffraction analysis shows that there is Cu₂O minor phase in the hot-pressed ceramics whereas only CuO secondary phase exists after a further thermal treatment in ambience. Both the hot-pressed ceramics and its further thermally treated one exhibit two dielectric relaxations at room temperature, whereas the conventionally sintered ceramics have only one dielectric relaxation. Moreover, the hot-pressed CCTO ceramics have an extremely large low-frequency permittivity of 2×10⁵, which further increases to nearly 1×10⁶ through the ambient thermal treatment. The relation between microstructure and dielectric property is also discussed.

Key words: hot-press sintering technique, CaCu₃Ti₄O₁₂, microstructure, dielectric property

中图分类号:

TM283

郝文涛, 张家良, 徐攀攀, 曹恩思, 彭华. 高密度CaCu₃Ti₄O₁₂陶瓷的介电性质[J]. 无机材料学报, 2014, 29(1): 67-70.

HAO Wen-Tao, ZHANG Jia-Liang, XU Pan-Pan, CAO En-Si, PENG Hua. Dielectric Property of High Density CaCu₃Ti₄O₁₂ Ceramics[J]. Journal of Inorganic Materials, 2014, 29(1): 67-70.

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高密度CaCu₃Ti₄O₁₂陶瓷的介电性质

Dielectric Property of High Density CaCu₃Ti₄O₁₂ Ceramics

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