Phase relations in the "FeO-V2O3" system at 1473 K and the magnetic properties of spinel phase Fe3-xVxO4
Phase relations in the "FeO-V2O3" system at 1473 K and the magnetic properties of spinel phase Fe3-xVxO4
复制标题
1473 K 时“FeO-V2O3”体系的相关系及尖晶石相 Fe3-xVxO4 的磁性能
DOI：
10.1016/j.ceramint.2019.11.082
复制
发表时间：
2020
影响因子：
5.2
通讯作者：
Deng Tengfei
中科院分区：
文献类型：
--
作者：
Yan Baijun;Wang Daya;Qiu Qiugen;Deng Tengfei
在1473 K、氧分压为5.98× 10− 15 ~ 2.39× 10− 8 atm的条件下，采用化学平衡和淬灭法测定了“FeO-V2 O3”氧化物体系的相关系，并进行了XRD和EPMA测量。在“FeO-V2 O3”氧化物体系中存在四个单变平衡和两个不变平衡。根据测定的相关系，绘制了log（pO 2/atm）与V/（Fe+ V）摩尔比的关系图。此外，在室温下测量了在不同氧分压下制备的一系列尖晶石Fe 3-xVx O 4化合物的磁性。结果表明，Fe/V大于1.2的Fe 3-xVxO 4化合物具有磁性，其磁化强度随Fe/V摩尔比的增大而显著增大;对于Fe/V摩尔比固定的Fe 3-xVxO 4化合物，其饱和磁化强度随制备时氧分压的增大而略有增大。
Phase relations within the “FeO–V 2 O 3” oxide system at 1473 K in the oxygen partial pressure range from 5.98× 10− 15 to 2.39× 10− 8 atm were determined using the chemical equilibrium and quench method followed by XRD and EPMA measurements. There exist four univariant equilibria and two invariant equilibria in the “FeO–V 2 O 3” oxide system. According to the determined phase relations, a phase diagram of this system was constructed by plotting log (p O 2/a t m) versus the molar ratio of V/(Fe+ V). Furthermore, the magnetic properties of a series of spinel Fe 3-x V x O 4 compounds prepared under different oxygen partial pressures were measured at room temperature. It was revealed that Fe 3-x V x O 4 compounds with Fe/V larger than 1.2 are magnetic, and their magnetizations increase remarkably with the increasing of the molar ratio of Fe/V. In addition, for the Fe 3-x V x O 4 compound with fixed molar ratio of Fe/V, its saturation magnetization increases slightly with the increasing of the oxygen partial pressure in which the compound was prepared.