Characterization of a new system of NTC temperature-sensitive ceramics based on Al/F modified NiO simple oxides
Characterization of a new system of NTC temperature-sensitive ceramics based on Al/F modified NiO simple oxides
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DOI：
10.1007/s10854-016-5531-0
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Gaomin Wang;Hong Zhang;Xiang Sun;Ya Liu;Zhicheng Li
中科院分区：
文献类型：
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作者：
Gaomin Wang;Hong Zhang;Xiang Sun;Ya Liu;Zhicheng Li
采用湿化学合成法和传统陶瓷烧结技术制备了Al/F改性NiO，Ni1−xAlxO1−yFy(x≤0.05，y≤0.05)陶瓷。研究了陶瓷的相组成和相关电性能。结果表明，所制备的陶瓷均具有电阻率负温度系数（NTC）效应。 Ni1−xAlxO1−yFyNTC 陶瓷的室温电阻率 (ρ25) 和材料常数 (B25/85) 可以通过改变 Al 和 F 的浓度来调节。Ni1−xAlxO0.96F0.04 中 Al 含量从 0 变化到 0.05 时，B25/85 值为 1705 到 5884 K。通过分析不同温度下的电化学阻抗谱研究表明，晶粒效应和晶界效应共同影响了陶瓷的NTC特性。针对 Ni1−xAlxO1−yFy 陶瓷中的 NTC 效应，提出了结合电子跳跃模型和能带传导的传导机制。
Al/F modified NiO, Ni1−xAlxO1−yFy(x≤ 0.05,y≤ 0.05), ceramics were prepared by using wet-chemical synthesis methods followed by a traditional ceramic sintering technology. The phase component and related electrical properties of the ceramics were investigated. The results show that all the prepared ceramics have the effect of negative temperature coefficient (NTC) of resistivity. The room temperature resistivities (ρ25) and material constants (B25/85) of the Ni1−xAlxO1−yFyNTC ceramics can be adjusted by changing the concentrations of Al and F. TheB25/85values are from 1705 to 5884 K for the Al-content changes from 0 to 0.05 in Ni1−xAlxO0.96F0.04. The investigations by analyzing the electrochemical impedance spectra at various temperatures show that both grain effect and grain-boundary effect contribute to the NTC feature of the ceramics. The conduction mechanisms combining the electron-hopping model and band conduction are proposed for the NTC effect in the Ni1−xAlxO1−yFyceramics.