High permittivity, low dielectric loss, and high electrostatic potential barrier in Ca₂Cu₂Ti₄O₁₂ ceramics

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• 作者：Jutapol Jumpatam^a ; Prasit Thongbai^a ; ^b ; ^{pthongbai@kku.ac.th} ; ^{prasitphysics@hotmail.com} ; Boonsong Kongsook^c ; Teerapon Yamwong^d ; Santi Maensiri^e
• 关键词：Dielectric properties ; CaCu3Ti4O12 ; Microstructure ; Giant dielectric
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：1 June, 2012
• 卷：76
• 期：Complete
• 页码：40-42
• 文件大小：858 K

摘要

Dielectric and nonlinear current-voltage properties of Ca₂Cu₂Ti₄O₁₂ (CaCu₃Ti₄O₁₂/CaTiO₃ composite) ceramics prepared by a simple thermal decomposition method were investigated. The results revealed that ceramics sintered at 1100 掳C for 12 h exhibited a high dielectric constant (蔚鈥?#xA0;~ 4.05 脳 10³) with temperature coefficient less than 卤 15%in the temperature range of 鈭?#xA0;55-85 掳C, low loss tangent (tan未 ~ 0.046) at 30 掳C and 1 kHz, and high electronic potential barrier height (桅_B = 0.856 eV). These are desirable for applications based on the capacitive component. 蔚鈥?and 桅_B increased significantly with increasing sintering time. tan未 was nearly constant. It suggests that a high value of 桅_B is caused by the effect of CCTO-CTO interface.