论文标题
高温热循环效应对晶格结构，磁性特性和电导率的不可逆响应的高温循环效应，$ _ {2.75} $ _ {0.25} $ _ {0.25} $ o $ $ _ {4+Δ} $ oxin
High temperature thermal cycling effect on the irreversible responses of lattice structure, magnetic properties and electrical conductivity in Co$_{2.75}$Fe$_{0.25}$O$_{4+δ}$ spinel oxide
论文作者
论文摘要
我们报告了Co $ _ {2.75} $ _ {2.75} $ _ {0.25} $ o $ $ $ $ $ _4 $ ferrite的样品的高温同步器X射线衍射（SXRD），DC磁化和电流 - 电压（I-V）特性。该材料是通过在pH = 11处的Fe和Co硝酸盐溶液的化学反应制备的，然后在温度200 0C，500 0C和900 0C处进行退火。通过将温度从300 K循环到高温（变暖模式），然后返回300 K（冷却模式）来进行测量。 SXRD模式表明在高度CO富含CO的氧化物中，基于双重的立方尖晶石结构。磁化曲线显示出内在的铁磁特征，并且在较高温度下诱发了额外的铁磁相。电导率显示温度变化和冷却模式之间的热磁滞回路。样品显示了有关循环测量温度的晶格结构，磁化和电导率的不可逆性现象的新信息。
We report high temperature synchrotron X-ray diffraction (SXRD), dc magnetization and current-voltage (I-V) characteristics for the samples of Co$_{2.75}$Fe$_{0.25}$O$_4$ ferrite. The material was prepared by chemical reaction of the Fe and Co nitrate solutions at pH = 11 and subsequent annealing at temperatures 200 0C, 500 0C and 900 0C. The measurements were performed by cycling the temperature from 300 K to high temperature (warming mode) and return back to 300 K (cooling mode). The SXRD patterns indicated a fine bi-phased cubic spinel structure in the highly Co rich spinel oxide. Magnetization curves showed intrinsic ferrimagnetic features and defect induced additional ferromagnetic phase at higher temperatures. Electrical conductivity showed thermal hysteresis loop between warming and cooling modes of temperature variation. The samples exhibited new information on the irreversibility phenomena of lattice structure, magnetization and electrical conductivity on cycling the measurement temperatures.
