传感器用Cu取代Ni-Zn铁氧体的结构、磁性和介电性能

P. Das, G. Singh
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引用次数: 2

摘要

采用350℃自燃烧法,在600、900、1000℃煅烧2h,合成了化学式为Ni0.5−xCuxZn0.5Fe2O4(0≤×≤0.3)的铜取代NiZn铁氧体粉末。所得粉体具有明显的七峰立方尖晶石结构,其空间群为Fd ~ ();随着Cu含量的增加,晶格常数显著增加,平均晶粒尺寸减小。在x = 0.1的最优条件下,在600℃下煅烧得到的样品晶粒尺寸小至26 nm,矫顽力高达158 Oe。电介质(έ, ε″和tanδ)分析表明,由于界面极化的麦克斯韦-瓦格纳型和Fe2+↔Fe3+之间的电荷跳变,电介质在低频区具有频率敏感特性,而在高频侧具有频率无关特性。在所研究的频率范围内,在1 kHz时获得最高介电常数~ 48,在4 MHz时获得最低介电损耗~ 0.06,而在同一样品中,在4 MHz时观察到最大频率传感响应~ 92%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Structural, magnetic and dielectric properties in Cu substituted Ni-Zn ferrite for sensors applications
Copper substituted NiZn ferrite powder of a chemical formula Ni0.5−xCuxZn0.5Fe2O4 (0≤ × ≤0.3) is synthesized by auto combustion process at 350°C followed by the calcination at 600, 900 and 1000°C for 2h. The derived powder shows well distinct total seven peaks of cubic spinel structure with space group Fdℨ̅m. The considerable increments in the lattice constant and the reduction in an average crystallite sizes are observed with increasing the Cu content. At the optimal condition of x = 0.1, the crystallite size as small as 26 nm and the coercivity as high as 158 Oe is obtained in samples calcined at 600°C. The dielectric (έ, ε″, and tanδ) analyses show the frequency sensitive behavior in the low frequency region and the frequency independent characteristics at high frequency side due to the Maxwell-Wagner type of interfacial polarization and also due to hopping of charges between Fe2+ ↔Fe3+. The highest dielectric constant ∼ 48 at 1 kHz and the lowest dielectric loss ∼ 0.06 at 4 MHz are obtained in the studied frequency range, whereas the maximum frequency sensing response ∼ 92% is observed at 4 MHz in same sample.
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