Effect of synthesis conditions on the preparation of YIG powders via co-precipitation method

CO-precipitation synthesis of iron-containing garnets Y3Al5−Fe O12 and their magnetic properties

“…2 (I), the YIG phase also was formed at 1373 K, but the Y 2 O 3 cubic phase persisted; a mixture of YFeO 3, Fe 2 O 3, and Y 2 O 3 was observed. This result is similar to previous reports that yttrium orthoferrite (YFeO 3 ) occurs as an impurity phase at low sintering temperature [6], suggesting that the synthesis of the YIG precursor is more complex than the YAG using AC as precipitating agents.…”

“…YAG has been well established as a laser host material [1], which is attributed to its relatively stable lattice structure and large thermal conductivity [3,4]. YIG is one of the most important ferrimagnetic materials and has been widely applied in, for instance, tuneable microwave devices, circulators, isolators, phase shifters, and nonlinear devices [2,[5][6][7]. These materials exhibit different physical-chemical properties because of their different atom coordination [3].…”

“…Compared with these methods, the co-precipitation method is a simpler and more cost-effective way for powder synthesis [5,6,15,16] because the precursor powders can be prepared on a large scale in water, rather than in organic chemicals without the use of a special apparatus. However, YIG prepared by the co-precipitation method generally used NaOH or NH 4 OH as the precipitant [15], but YAG typically used weak-alkaline solution as the precipitant (NH 4 OH or ammonium hydrogen carbonate (AHC)) because of the amphotericity of Al(OH) 3 .…”

Effect of synthesis conditions on the preparation of BiFeO3 nanopowders using two different methods

“…and also a Pechini-type process (citrate precursor method). The technique is simple, uses low cost starting materials, low synthesis temperature, yields fine microstructure, homogeneity, narrow particle size distribution and is considered an environmentally friendly methods that offers scalability for large scale production [35,36]. The properties of BiFeO 3 are strongly depending on their chemical composition and microstructure.…”

Improvement of the magnetic properties of barium hexaferrite nanopowders using modified co-precipitation method

“…Furthermore, the molecular level mixing and the tendency of partially hydrolyzed species to form extended networks facilitate the structure evolution thereby lowering the crystallization temperature of the prepared ferrite. Moreover, the co-precipitation processing offers considerable advantages, such as the better mixing of the starting materials and the excellent chemical homogeneity of the final product [25]. The main drawback is that the particle size is not relatively small and monodispersed enough for specific applications like recording media applications [26,27].…”