Ferrites are a broad class of iron-containing oxides that includes spinel ferrites MFe_(2)O_(4),perovskites MFeO_(3),and hexagonal ferrites (hexaferrites) such as BaFe_(12)O_(19).These materials have a wide array of a...Ferrites are a broad class of iron-containing oxides that includes spinel ferrites MFe_(2)O_(4),perovskites MFeO_(3),and hexagonal ferrites (hexaferrites) such as BaFe_(12)O_(19).These materials have a wide array of applications owing to their diverse properties:notable instances include catalysis,piezoelectric components,magnetic components,biomedical applications,heterogeneous catalysis and photocatalysis.Given the growing importance of environmentally friendly,low-temperature methodologies to obtain functional materials,there is a growing interest in synthetic approaches which are compatible with the principles of “green chemistry”.In this context,wet chemistry represents an attractive choice,and furthermore offers the possibility of scale-up for manufacture of materials in volumes for practical application.Though there is a sizeable amount of literature on the synthesis of ferrites,the most common approaches require treatments at temperatures above 200℃,either as the main synthetic procedure itself (thermal decomposition),or as a post-synthetic step (for example,calcination after sol–gel autocombustion).This review aims at summarising,categorising,classifying and critically discussing the different low-temperature (<200℃),wet chemistry approaches employed in recent years for the synthesis of ferrites.This will include hydrothermal,solvothermal,sonochemical,and microwave methods,with examples taken from literature making reference to the various sub-classes of ferrites.展开更多
文摘Ferrites are a broad class of iron-containing oxides that includes spinel ferrites MFe_(2)O_(4),perovskites MFeO_(3),and hexagonal ferrites (hexaferrites) such as BaFe_(12)O_(19).These materials have a wide array of applications owing to their diverse properties:notable instances include catalysis,piezoelectric components,magnetic components,biomedical applications,heterogeneous catalysis and photocatalysis.Given the growing importance of environmentally friendly,low-temperature methodologies to obtain functional materials,there is a growing interest in synthetic approaches which are compatible with the principles of “green chemistry”.In this context,wet chemistry represents an attractive choice,and furthermore offers the possibility of scale-up for manufacture of materials in volumes for practical application.Though there is a sizeable amount of literature on the synthesis of ferrites,the most common approaches require treatments at temperatures above 200℃,either as the main synthetic procedure itself (thermal decomposition),or as a post-synthetic step (for example,calcination after sol–gel autocombustion).This review aims at summarising,categorising,classifying and critically discussing the different low-temperature (<200℃),wet chemistry approaches employed in recent years for the synthesis of ferrites.This will include hydrothermal,solvothermal,sonochemical,and microwave methods,with examples taken from literature making reference to the various sub-classes of ferrites.
