温和条件下元素对M^(2+)/Fe^(2+)/Fe^(3+)-LDHs转化成尖晶石铁氧体过程的影响(英文)

Effect of Metal Ion on Conversion from M^(2+)/Fe^(2+)/Fe^(3+)-LDHs to Spinel Ferrites under Mild Conditions

研究了二价金属离子在温和条件下(低于100℃,暴露于空气中)从水滑石M2+/Fe2+/Fe3+-LDHs(M=Co,Ni,Mn,Zn)转化成尖晶石铁氧体的过程中所起的作用。结果表明,该转化过程不仅与晶化温度有关,还与M2+在元素周期表中所处的位置有关。当这些二价金属离子处于同一周期并且相邻较近时,M2+的半径越大,水滑石微晶向尖晶石铁氧体的转化就越容易。此外,Fe2+在转化过程中起着至关重要的作用,如果没有Fe2+的参与,在此条件下的转化将无法进行。

The Effect of divalent metal ion was studied on conversion of M2＋/Fe2＋/Fe3＋-LDHs （M=Co, Ni, Mn, Zn） to spinel ferrites under mild conditions （below 100 ℃ in open air）. The results show that the conversion is not only affected by aging temperature but also by position of M2＋ in periodic table of elements. Large radius of M2＋ ions will result in much easier formation of spinel ferrites from LDH microcrystallines when these ions are in the same period and close to each other. Also the existence of Fe2＋ plays an important role in the process, and the conversion could not happen without participation of Fe2＋ under the conditions studied.