摘要
A Raman study was carried out for LiMn 2O 4, which was synthesized via the mixture of Mn 3O 4 and LiNO 3 sintered at different temperatures. It is shown that there are two kinds of Raman spectra for LiMn 2O 4 at different sintering temperatures, while the X-ray diffraction patterns of LiMn 2O 4 sintered at different temperatures are the same. Five Raman bands observed for the materials sintered below 500 ℃ are consistent with the theoretical prediction for spinel structure based on the group theory. Only two Raman bands were observed for the materials sintered at temperatures higher than 500 ℃. The best preparation condition for obtaining a good spinel LiMn 2O 4 is suggested based on the Raman study.
A Raman study was carried out for LiMn 2O 4, which was synthesized via the mixture of Mn 3O 4 and LiNO 3 sintered at different temperatures. It is shown that there are two kinds of Raman spectra for LiMn 2O 4 at different sintering temperatures, while the X-ray diffraction patterns of LiMn 2O 4 sintered at different temperatures are the same. Five Raman bands observed for the materials sintered below 500 ℃ are consistent with the theoretical prediction for spinel structure based on the group theory. Only two Raman bands were observed for the materials sintered at temperatures higher than 500 ℃. The best preparation condition for obtaining a good spinel LiMn 2O 4 is suggested based on the Raman study.
基金
SupportedbytheNational NaturalScienceFoundation of China( No.5 0 2 72 0 2 3),the Special Funds for Major State Ba-sic researchProject of China under( No.2 0 0 2 CB2 1180 2) and the Research Grant for Ph.D Programs from Ministry ofEduca-tion( No.2 0 0 10
