La3+，Nd3+，Ti4+掺杂对纳米MnZn铁氧体粉末结构的影响

La3+;Nd3+;Ti4+掺杂对纳米MnZn铁氧体粉末结构的影响;水热法

Effect of La3+,Nd3+,Ti4+ Doping on the Structure of Nano-MnZn Ferrite Powders

MnZn ferrite nanosized particles are synthesized by using a hydrothermal method. Effects of the added amount of La 3 , Nd 3 , Ti 4 and multi-elements on the particle size and shape and structure of the products are investigated. The results show that the particle size of Ti-doped MnZn ferrite powders is increased obviously and even over 100 nm when the mass fraction of Ti 4 exceeds 1.0%, but the addition of La 3 or Nd 3 has not obvious effect on the particle size of nano-MnZn ferrite powders. The TEM micrographs give homogeneous hexagonal crystallites when the mass fraction of La 3 is 1.2%, indicating that such an amount of La 3 ions have great influence on the crystallization of the hydrothermal process and can change and improve the growth of crystallites. In the samples doped with 0.4% La 3 or Nd 3 other phases besides the spinel are observed, but it is not in the case of multi-element doping. The spinel characteristic peaks in IR spectrum of nano-MnZn ferrite sample with dopants is found to be moved to lower frequency as compared with that of the undoped, implying that the distribution of the ions in MnZn has been influenced by the introduction of doping ions into the paracorystalline phase of the ferrite.