Effects of Zn-doped on the microstructure and electrical properties of Mn1.5 − xCo1.2Cu0.3ZnxO4(0 ≤ x ≤ 0.5) NTC ceramics
Effects of Zn-doped on the microstructure and electrical properties of Mn1.5 − xCo1.2Cu0.3ZnxO4(0 ≤ x ≤ 0.5) NTC ceramics
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DOI：
10.1007/s10854-017-8471-4
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发表时间：
2018-03
期刊：
影响因子：
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通讯作者：
Mengyu Guan;Jincheng Yao;W. Kong;Junhua Wang;Aimin Chang
中科院分区：
文献类型：
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作者：
Mengyu Guan;Jincheng Yao;W. Kong;Junhua Wang;Aimin Chang
本文采用传统的固相反应法制备了Mn1.5 − xCo1.2Cu0.3ZnxO4（0 ≤ x ≤ 0.5）负温度系数（NTC）陶瓷。采用热重-差示扫描量热法、X射线衍射、扫描电镜、电学测试和X射线光电子能谱分析等方法研究了Zn的加入对合金微观结构和电学性能的影响。结果表明，当x ≤ 0.2时，电阻率随Zn离子含量的增加略有下降，但随着Zn离子含量的增加，电阻率显著增加。Mn1.5 − xCo1.2Cu0.3ZnxO4（0 ≤ x ≤ 0.5）NTC热敏电阻的ρ 25和B25/50分别在126-706 Ω cm和3323-3714 K范围内。在125 °C下老化500 h后，相对电阻漂移（ΔR/R 0）在2.7-1.13%之间，当Zn含量x = 0.5时，相对电阻漂移最小。这表明，通过控制Zn离子掺杂含量，可以将电性能调节到期望值。最重要的是，Zn掺杂可以有效提高Mn1.5 − xCo1.2Cu0.3ZnxO4陶瓷的稳定性。
In this paper, the Mn1.5 − xCo1.2Cu0.3ZnxO4(0 ≤ x ≤ 0.5) negative temperature coefficient (NTC) ceramics were attained by the traditional solid state reaction method. The effects of Zn addition on microstructure and electrical properties were characterized by thermo-gravimetry–differential scanning calorimetry, X-ray diffraction, scanning electron microscope, electrical measurement and X-ray photoelectron spectroscopy analysis. It was found that the resistivity decreased slightly with increasing Zn ions content for x ≤ 0.2, but increased remarkably for higher Zn ions content. The values ρ25and B25/50of Mn1.5 − xCo1.2Cu0.3ZnxO4(0 ≤ x ≤ 0.5) NTC thermistors were in the range of 126–706 Ω cm and 3323–3714 K, respectively. The values of relative resistance drift (ΔR/R0) were in the range of 2.7–1.13% and had a minimum value with the Zn content x = 0.5 after aging test at 125 °C for 500 h. This suggests that the electrical properties can be adjusted to desired values by controlling the Zn ion doping content. Most importantly, the stability of Mn1.5 − xCo1.2Cu0.3ZnxO4ceramic can be effectively improved by Zn doping.