Incipient ferroelectricity and microwave dielectric resonance properties of CaCu2.85Mn0.15Ti4O12 ceramics
Incipient ferroelectricity and microwave dielectric resonance properties of CaCu2.85Mn0.15Ti4O12 ceramics
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DOI：
10.1063/1.2769954
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发表时间：
2007-09
影响因子：
4
通讯作者：
M. Li;A. Feteira;D. Sinclair;A. West
中科院分区：
文献类型：
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作者：
M. Li;A. Feteira;D. Sinclair;A. West
制备了Mn掺杂的CaCu 3 Ti4 O 12陶瓷（名义成分为CaCu2.85Mn0.15Ti4O12（CCMTO）），并研究了其无线电和微波介电性能。在300 K时，致密的CCMTO陶瓷具有明显的晶粒电阻率，为<$20 M Ωcm，表现出微波介电谐振特性，谐振频率的温度系数为<$93，Qf为<$3950 GHz（3.95 GHz），谐振频率的温度系数为<$+657 ppm <$K。Er在10- 300 K范围内从150 ~ 90平稳下降，在60- 180 K范围内服从居里-外斯定律，与铁电性的初始相一致。讨论了CCMTO陶瓷的初始铁电性的来源和潜在的应用。
Mn-doped CaCu3Ti4O12 ceramics with nominal composition CaCu2.85Mn0.15Ti4O12 (CCMTO) have been prepared and their radio- and micro-wave dielectric properties established. At 300 K, dense CCMTO ceramics have appreciable grain resistivity, ∼20MΩcm, and exhibit microwave dielectric resonance with er∼93, Qf∼3950GHz (at 3.95GHz) and temperature coefficient of resonant frequency ∼+657ppm∕K. er decreases smoothly from ∼150 to 90 in the range of 10–300K, obeys the Curie-Weiss law in the range of ∼60–180K, and is consistent with incipient ferroelectricity. The source of the incipient ferroelectricity and potential applications of CCMTO ceramics are discussed.