当前位置: X-MOL 学术Results Phys. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Tunability of ac conductivity in manganese doped cobalt ferrite nanoparticles
Results in Physics ( IF 4.4 ) Pub Date : 2020-12-28 , DOI: 10.1016/j.rinp.2020.103782
M.Z. Ahsan , M.A. Islam , F.A. Khan

This paper reports on the experimental findings of ac conductivity as determined from the measurement of conductance by using the Waynekerr 6500B impedance analyzer for the stoichiometric and non-stoichiometric manganese doped cobalt ferrite nanoparticles. In the dispersion of ac conductivity over the frequency band 100 Hz–1 MHz, two distinct conductive bands 100 Hz–1 kHz and 1 kHz–1 MHz for stoichiometric compositions, and 100 Hz–3 kHz and 3 kHz–1 MHz for non-stoichiometric compositions are observed. On the other hand, well-resolved peaks are observed in the dispersion of ac conductivity over the frequency band 1–120 MHz that corresponds to the hopping resonance for both the compositions. The ac conductivity is found to be tunable by the Mn content and selectable by the frequency between cutoff frequencies for both the compositions. A comparatively higher magnitude of ac conductivity is observed for the representative sample of non-stoichiometric composition and a lower magnitude for the stoichiometric compositions. The presence of tunability of ac conductivity in the studied samples is, therefore, a concern on which basis, the Joule’s heat and Joule’s heat per unit time have been determined for the studied samples by using the usual formula and also found to be tunable by the manganese content. This tunability of the generated Joule’s heat may make these possible to use in the temperature switching/sensing, and/or thermoelectric/thermomagnetic devices.



中文翻译:

锰掺杂钴铁氧体纳米粒子中交流电导率的可调性

本文报告了通过使用Waynekerr 6500B阻抗分析仪测量化学计量和非化学计量的锰掺杂钴铁氧体纳米粒子的电导率而得出的交流电导率的实验结果。在交流电导率在100 Hz–1 MHz频带内的色散中,对于化学计量成分,两个截然不同的导电频带分别为100 Hz–1 kHz和1 kHz–1 MHz,对于非化学成分,则为100 Hz–3 kHz和3 kHz–1 MHz。观察到化学计量组成。另一方面,在1–120 MHz频带上,交流电导率的色散中观察到了很好分辨的峰,这与两种成分的跳跃共振相对应。发现对于两种组合物,交流电导率可以通过Mn含量来调节,并且可以通过截止频率之间的频率来选择。对于非化学计量组成的代表性样品,观察到相对较高的交流电导率,而对于化学计量组成,则观察到较低的交流电导率。因此,在研究样品中是否存在交流电导率的可调性是一个问题,在此基础上,可以使用通常的公式确定研究样品的焦耳热和每单位时间的焦耳热,并且可以通过以下公式进行调节锰含量。所产生的焦耳热的这种可调谐性可使它们在温度切换/感测和/或热电/热磁设备中使用。因此,在研究样品中是否存在交流电导率的可调性是一个问题,在此基础上,可以使用通常的公式确定研究样品的焦耳热和每单位时间的焦耳热,并且可以通过以下公式进行调节锰含量。所产生的焦耳热的这种可调谐性可使它们在温度切换/感测和/或热电/热磁设备中使用。因此,在研究样品中是否存在交流电导率的可调性是一个问题,在此基础上,可以使用通常的公式确定研究样品的焦耳热和每单位时间的焦耳热,并且可以通过以下公式进行调节锰含量。所产生的焦耳热的这种可调谐性可使它们在温度切换/感测和/或热电/热磁设备中使用。

更新日期:2021-01-08
down
wechat
bug