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 ...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.展开更多
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
文摘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.
