Abstract

A number of tetrametallic layered double hydroxides containing magnesium and cobalt on the site of doubly charged cations in the structure of brucite-like layers and aluminum and iron on the site of triply charged cations have been synthesized using three distinct methods: coprecipitation, microwave synthesis, and hydrothermal crystallization. A sodium hydroxide solution was used as a precipitant. The results demonstrate that all three methods yield a well-crystallized hydrotalcite-like layered hydroxide and an impurity phase. We believe that it is the impurity phase which is responsible for the magnetism of the materials. Most likely, this phase is spinel CoFe₂O₄.

中文翻译：

---

合成方法对层状双金属氢氧化物相组成和磁性的影响

摘要

已使用三种不同的方法合成了许多类似水镁石结构的双金属阳离子双金属氢氧化物，其中镁和钴位于水镁石样层结构中的双电荷阳离子位点，铝和铁位于三重电荷阳离子的位点。和水热结晶。氢氧化钠溶液用作沉淀剂。结果表明，所有三种方法均产生良好结晶的水滑石状层状氢氧化物和杂质相。我们认为，正是杂质相导致了材料的磁性。该相最可能是尖晶石CoFe ₂ O ₄。